diff --git a/sh/.shellcheckrc b/.shellcheckrc
similarity index 100%
rename from sh/.shellcheckrc
rename to .shellcheckrc
diff --git a/pyproject.toml b/pyproject.toml
index 1d231ec..7a3d9c9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ dependencies = []
 description = "Read Write eXecute"
 dynamic = ["version"]
 keywords = []
-license-files = { paths = ["license.md"] }
+license-files = ["license.md"]
 name = "rwx"
 readme = "readme.md"
 requires-python = ">= 3.11"
@@ -30,16 +30,3 @@ requires-python = ">= 3.11"
 
 [tool.hatch.version]
 path = "rwx/__init__.py"
-
-[tool.pydoclint]
-allow-init-docstring = true
-quiet = true
-skip-checking-short-docstrings = false
-style = "sphinx"
-
-[tool.ruff]
-line-length = 80
-
-[tool.ruff.lint]
-ignore = ["COM812", "D203", "D213", "ISC001"]
-select = ["ALL"]
diff --git a/rwx/fs/__init__.py b/rwx/fs/__init__.py
index 0772a8d..8a45288 100644
--- a/rwx/fs/__init__.py
+++ b/rwx/fs/__init__.py
@@ -2,9 +2,10 @@
 
 import os
 import shutil
-import tomllib
 from pathlib import Path
 
+import tomllib
+
 from rwx import ps
 
 CHARSET = "UTF-8"
@@ -61,7 +62,7 @@ def get_path_mount(path: Path) -> Path:
             "stat",
             ("--format", "%m"),
             str(path),
-        )
+        ),
     )
 
 
diff --git a/rwx/grub/__init__.py b/rwx/grub/__init__.py
index 572b13e..aa208c3 100644
--- a/rwx/grub/__init__.py
+++ b/rwx/grub/__init__.py
@@ -1,5 +1,7 @@
 """Wrap GRUB commands."""
 
+from __future__ import annotations
+
 from rwx import cmd, ps
 
 cmd.need("grub-mkimage")
diff --git a/rwx/ps/__init__.py b/rwx/ps/__init__.py
index 82c9640..3bef50d 100644
--- a/rwx/ps/__init__.py
+++ b/rwx/ps/__init__.py
@@ -1,5 +1,7 @@
 """Handle processes."""
 
+from __future__ import annotations
+
 import subprocess
 
 from rwx import Object, txt
@@ -43,7 +45,9 @@ def run(*items: str | tuple[str, ...]) -> subprocess.CompletedProcess:
     :rtype: subprocess.CompletedProcess
     """
     return subprocess.run(
-        get_tuples_args(*items), capture_output=False, check=True
+        get_tuples_args(*items),
+        capture_output=False,
+        check=True,
     )
 
 
@@ -61,7 +65,8 @@ def run_line(*items: str | tuple[str, ...], charset: str = txt.CHARSET) -> str:
 
 
 def run_lines(
-    *items: str | tuple[str, ...], charset: str = txt.CHARSET
+    *items: str | tuple[str, ...],
+    charset: str = txt.CHARSET,
 ) -> list[str]:
     """Run and return output lines.
 
@@ -72,7 +77,9 @@ def run_lines(
     :rtype: list[str]
     """
     process = subprocess.run(
-        get_tuples_args(*items), capture_output=True, check=True
+        get_tuples_args(*items),
+        capture_output=True,
+        check=True,
     )
     string = process.stdout.decode(charset)
     return string.rstrip().splitlines()
diff --git a/sh/alias/git.sh b/sh/alias/git.sh
index 6400092..cadd10b 100644
--- a/sh/alias/git.sh
+++ b/sh/alias/git.sh
@@ -1,4 +1,4 @@
-SH_GIT_LOG_FORMAT="\
+RWX_GIT_LOG_FORMAT="\
 %C(auto)%h%d
 S %C(red)%GS
 A %C(green)%an %ae
@@ -240,11 +240,12 @@ a__git_diff_word() {
 # fetch from the remote repository
 gf() { a__git_fetch "${@}"; }
 a__git_fetch() {
-	git \
-		fetch \
-		--tags \
-		--verbose \
-		"${@}"
+	rwx_gpg_agent_update &&
+		git \
+			fetch \
+			--tags \
+			--verbose \
+			"${@}"
 }
 
 # fetch from remote repository and prune local orphan branches
@@ -293,7 +294,7 @@ a__git_log() {
 		log \
 		--abbrev=8 \
 		--abbrev-commit \
-		--format="${SH_GIT_LOG_FORMAT}" \
+		--format="${RWX_GIT_LOG_FORMAT}" \
 		--graph \
 		"${@}"
 }
@@ -371,11 +372,12 @@ a__git_merge_tool() {
 # push to the remote repository
 gp() { a__git_push "${@}"; }
 a__git_push() {
-	git \
-		push \
-		--tags \
-		--verbose \
-		"${@}"
+	rwx_gpg_agent_update &&
+		git \
+			push \
+			--tags \
+			--verbose \
+			"${@}"
 }
 
 # delete from the remote repository
@@ -533,3 +535,14 @@ a__git_tag_delete() {
 		--delete \
 		"${@}"
 }
+
+# update head ref
+gurh() { a__git_update_ref_head "${@}"; }
+a__git_update_ref_head() {
+	if [ -n "${2}" ]; then
+		git \
+			update-ref \
+			"refs/heads/${1}" \
+			"${2}"
+	fi
+}
diff --git a/sh/alias/gpg.sh b/sh/alias/gpg.sh
index 496b05e..eb19651 100644
--- a/sh/alias/gpg.sh
+++ b/sh/alias/gpg.sh
@@ -8,7 +8,5 @@ a__gpg_agent_kill() {
 # bind gpg agent to current tty
 gau() { a__gpg_agent_update "${@}"; }
 a__gpg_agent_update() {
-	gpg-connect-agent \
-		updatestartuptty \
-		/bye
+	rwx_gpg_agent_update
 }
diff --git a/sh/cryptsetup.sh b/sh/cryptsetup.sh
new file mode 100644
index 0000000..900083d
--- /dev/null
+++ b/sh/cryptsetup.sh
@@ -0,0 +1,6 @@
+_rwx_cmd_cs() { rwx_crypt_setup "${@}"; }
+
+rwx_crypt_setup() {
+	local action="${1}"
+	echo "cs: ${action}"
+}
diff --git a/sh/ffmpeg.sh b/sh/ffmpeg.sh
new file mode 100644
index 0000000..bcb3a62
--- /dev/null
+++ b/sh/ffmpeg.sh
@@ -0,0 +1,194 @@
+# ╭────────┬─────────┬───────╮
+# │ ffmpeg │ devices │ reset │
+# ╰────────┴─────────┴───────╯
+
+_rwx_cmd_rwx_ffmpeg_devices_reset() { rwx_ffmpeg_devices_reset "${@}"; }
+rwx_ffmpeg_devices_reset() {
+	local module="uvcvideo"
+	modprobe --remove "${module}" &&
+		modprobe "${module}"
+}
+
+# ╭────────┬────────┬─────────╮
+# │ ffmpeg │ device │ formats │
+# ╰────────┴────────┴─────────╯
+
+rwx_ffmpeg_device_formats() {
+	local device="${1}"
+	[ -n "${device}" ] || device="/dev/video0"
+	ffmpeg \
+		-f "v4l2" \
+		-list_formats "all" \
+		-i "${device}"
+}
+
+# ╭────────┬───────╮
+# │ ffmpeg │ input │
+# ╰────────┴───────╯
+
+rwx_ffmpeg_input_blue_yeti() {
+	local device="alsa_input.\
+usb-Generic_Blue_Microphones_2051BAB04XY8-00.analog-stereo"
+	set -- \
+		-f "pulse" \
+		-i "${device}" \
+		-ac "2" \
+		-ar "48000"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_input_dell_precision() {
+	local device="alsa_input.\
+pci-0000_00_1f.3.analog-stereo"
+	set -- \
+		-f "pulse" \
+		-i "${device}" \
+		-ac "2" \
+		-ar "48000"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_input_file() {
+	local file="${1}"
+	local from="${2}"
+	local to="${3}"
+	[ -n "${file}" ] || return
+	set -- \
+		-i "${file}"
+	if [ -n "${to}" ]; then
+		set -- "${@}" \
+			-ss "${from}" \
+			-to "${to}"
+	fi
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_input_hdmi() {
+	local device="${1}"
+	[ -n "${device}" ] || device="/dev/video0"
+	set -- \
+		-f "v4l2" \
+		-video_size "1920x1080" \
+		-framerate "60" \
+		-input_format "yuyv422" \
+		-i "${device}"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+# ╭────────┬────────╮
+# │ ffmpeg │ output │
+# ╰────────┴────────╯
+
+rwx_ffmpeg_output_audio_fast() {
+	set -- \
+		-codec:a "flac" \
+		-compression_level "0"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_output_audio_slow() {
+	set -- \
+		-codec:a "libopus" \
+		-b:a "128k"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_output_file() {
+	local file="${1}"
+	[ -n "${file}" ] || return
+	set -- \
+		-y "${file}"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_output_video_fast() {
+	set -- \
+		-codec:v "libx264" \
+		-preset "ultrafast" \
+		-crf "0"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+rwx_ffmpeg_output_video_slow() {
+	local crf="${1}"
+	local codec="${2}"
+	[ -n "${codec}" ] || codec="libx264"
+	if [ -z "${crm}" ]; then
+		case "${codec}" in
+		"libx264") crf="23" ;;
+		"libx265") crf="28" ;;
+		*) ;;
+		esac
+	fi
+	set -- \
+		-codec:v "${codec}" \
+		-preset "veryslow" \
+		-crf "${crf}" \
+		-movflags "+faststart" \
+		-pix_fmt "yuv420p"
+	local argument
+	for argument in "${@}"; do echo "${argument}"; done
+}
+
+# ╭────────┬────────╮
+# │ ffmpeg │ record │
+# ╰────────┴────────╯
+
+rwx_ffmpeg_record_hdmi_precision() {
+	local file="${1}"
+	[ -n "${file}" ] || return
+	# LATER alternative
+	# shellcheck disable=SC2046,SC2312
+	set -- \
+		$(rwx_ffmpeg_input_hdmi) \
+		$(rwx_ffmpeg_input_dell_precision) \
+		$(rwx_ffmpeg_output_video_fast) \
+		$(rwx_ffmpeg_output_audio_fast) \
+		$(rwx_ffmpeg_output_file "${file}")
+	echo "${@}"
+	ffmpeg "${@}"
+}
+
+rwx_ffmpeg_record_hdmi_yeti() {
+	local file="${1}"
+	[ -n "${file}" ] || return
+	# LATER alternative
+	# shellcheck disable=SC2046,SC2312
+	set -- \
+		$(rwx_ffmpeg_input_hdmi) \
+		$(rwx_ffmpeg_input_blue_yeti) \
+		$(rwx_ffmpeg_output_video_fast) \
+		$(rwx_ffmpeg_output_audio_fast) \
+		$(rwx_ffmpeg_output_file "${file}")
+	echo "${@}"
+	ffmpeg "${@}"
+}
+
+# ╭────────┬────────╮
+# │ ffmpeg │ reduce │
+# ╰────────┴────────╯
+
+rwx_ffmpeg_reduce() {
+	local input="${1}"
+	local output="${2}"
+	local from="${3}"
+	local to="${4}"
+	[ -n "${output}" ] || return
+	# LATER alternative
+	# shellcheck disable=SC2046,SC2312
+	set -- \
+		$(rwx_ffmpeg_input_file "${input}" "${from}" "${to}") \
+		$(rwx_ffmpeg_output_video_slow) \
+		$(rwx_ffmpeg_output_audio_slow) \
+		$(rwx_ffmpeg_output_file "${output}")
+	echo "${@}"
+	ffmpeg "${@}"
+}
diff --git a/sh/gnome.sh b/sh/gnome.sh
index 11831fb..b17a058 100644
--- a/sh/gnome.sh
+++ b/sh/gnome.sh
@@ -1,3 +1,27 @@
+# ╭───────┬────────────╮
+# │ gnome │ background │
+# ╰───────┴────────────╯
+
+rwx_gnome_background_black() {
+	rwx_gnome_set_background "color-shading-type" "solid"
+	rwx_gnome_set_background "primary-color" "#000000"
+}
+
+rwx_gnome_background_white() {
+	rwx_gnome_set_background "color-shading-type" "solid"
+	rwx_gnome_set_background "primary-color" "#ffffff"
+}
+
+rwx_gnome_background_win3() {
+	rwx_gnome_set_background "color-shading-type" "vertical"
+	rwx_gnome_set_background "primary-color" "#000000"
+	rwx_gnome_set_background "secondary-color" "#0000ff"
+}
+
+# ╭───────┬───────╮
+# │ gnome │ proxy │
+# ╰───────┴───────╯
+
 rwx_gnome_proxy() {
 	local value
 	case "${1}" in
@@ -7,6 +31,29 @@ rwx_gnome_proxy() {
 	gsettings set "org.gnome.system.proxy" "mode" "${value}"
 }
 
+# ╭───────┬─────╮
+# │ gnome │ set │
+# ╰───────┴─────╯
+
+rwx_gnome_set() {
+	local group="${1}"
+	local key="${2}"
+	local value="${3}"
+	[ -n "${value}" ] || return
+	gsettings set "${group}" "${key}" "${value}"
+}
+
+rwx_gnome_set_background() {
+	local key="${1}"
+	local value="${2}"
+	[ -n "${value}" ] || return
+	rwx_gnome_set "org.gnome.desktop.background" "${key}" "${value}"
+}
+
+# ╭───────┬────────────╮
+# │ gnome │ workspaces │
+# ╰───────┴────────────╯
+
 rwx_gnome_workspaces_primary() {
 	local bool
 	local group="org.gnome.mutter"
diff --git a/sh/gpg.sh b/sh/gpg.sh
index a2b7f50..b5ce07b 100644
--- a/sh/gpg.sh
+++ b/sh/gpg.sh
@@ -1,3 +1,10 @@
+# bind gpg agent to current tty
+rwx_gpg_agent_update() {
+	gpg-connect-agent \
+		updatestartuptty \
+		/bye
+}
+
 rwx_gpg_ssh_auth_sock() {
 	local user_id
 	user_id=$(id --user)
diff --git a/sh/lint/gitlint.sh b/sh/lint/gitlint.sh
new file mode 100644
index 0000000..643333c
--- /dev/null
+++ b/sh/lint/gitlint.sh
@@ -0,0 +1,6 @@
+rwx_gitlint() {
+	local path="${1}"
+	gitlint \
+		--target "${path}" \
+		"lint"
+}
diff --git a/sh/lint/lint.sh b/sh/lint/lint.sh
new file mode 100644
index 0000000..365773f
--- /dev/null
+++ b/sh/lint/lint.sh
@@ -0,0 +1,78 @@
+# lint code
+rwx_lint() {
+	local path="${1}"
+	[ -n "${path}" ] || return 1
+	rwx_lint_clean "${path}"
+	rwx_lint_tasks "${path}"
+	set \
+		"python" \
+		"shell"
+	local code
+	for code in "${@}"; do
+		rwx_log "" "${code}"
+		"rwx_lint_${code}" "${path}"
+	done
+	rwx_lint_clean "${path}"
+}
+
+# clean
+rwx_lint_clean() {
+	local path="${1}"
+	[ -n "${path}" ] || return 1
+	rwx_log "" "clean" ""
+	py3clean "${path}"
+	set \
+		"mypy" \
+		"ruff"
+	local tool
+	for tool in "${@}"; do
+		rwx_remove "${path}/.${tool}_cache"
+	done
+}
+
+# lint python code
+rwx_lint_python() {
+	local path="${1}"
+	local action
+	set \
+		"pylint" \
+		"pydoclint" \
+		"mypy" \
+		"ruff"
+	for action in "${@}"; do
+		rwx_log "" "${action}"
+		"rwx_${action}" "${path}"
+	done
+}
+
+# lint shell code
+rwx_lint_shell() {
+	local path="${1}"
+	local action
+	set \
+		"shellcheck" \
+		"shfmt"
+	for action in "${@}"; do
+		rwx_log "" "${action}"
+		"rwx_${action}" "${path}"
+	done
+}
+
+# lint code tasks
+rwx_lint_tasks() {
+	local path="${1}"
+	local type
+	set \
+		"LATER" \
+		"TODO" \
+		"FIXME"
+	for type in "${@}"; do
+		rwx_log "" "${type}"
+		grep \
+			--after "1" \
+			--directories "recurse" \
+			--line-number \
+			" ${type}" \
+			"${path}"
+	done
+}
diff --git a/sh/lint/mypy.sh b/sh/lint/mypy.sh
new file mode 100644
index 0000000..586d409
--- /dev/null
+++ b/sh/lint/mypy.sh
@@ -0,0 +1,4 @@
+rwx_mypy() {
+	local path="${1}"
+	mypy "${path}"
+}
diff --git a/sh/lint/pydoclint.sh b/sh/lint/pydoclint.sh
new file mode 100644
index 0000000..d2eb72f
--- /dev/null
+++ b/sh/lint/pydoclint.sh
@@ -0,0 +1,9 @@
+rwx_pydoclint() {
+	local path="${1}"
+	pydoclint \
+		--allow-init-docstring True \
+		--quiet \
+		--skip-checking-short-docstrings False \
+		--style "sphinx" \
+		"${path}"
+}
diff --git a/sh/lint/pylint.sh b/sh/lint/pylint.sh
new file mode 100644
index 0000000..52e1bd1
--- /dev/null
+++ b/sh/lint/pylint.sh
@@ -0,0 +1,6 @@
+rwx_pylint() {
+	local path="${1}"
+	pylint \
+		--enable-all-extensions \
+		"${path}/**/*.py"
+}
diff --git a/sh/lint/ruff.sh b/sh/lint/ruff.sh
new file mode 100644
index 0000000..e15b701
--- /dev/null
+++ b/sh/lint/ruff.sh
@@ -0,0 +1,28 @@
+rwx_ruff() {
+	local path="${1}"
+	local action
+	set \
+		"check" \
+		"format"
+	for action in "${@}"; do
+		"rwx_ruff_${action}" "${path}"
+	done
+}
+
+rwx_ruff_check() {
+	local path="${1}"
+	ruff check \
+		--ignore "D203,D213" \
+		--isolated \
+		--select "ALL" \
+		"${path}"
+}
+
+rwx_ruff_format() {
+	local path="${1}"
+	ruff format \
+		--diff \
+		--isolated \
+		--line-length "80" \
+		"${path}"
+}
diff --git a/sh/lint/shellcheck.sh b/sh/lint/shellcheck.sh
index f31b2b4..ac8c700 100644
--- a/sh/lint/shellcheck.sh
+++ b/sh/lint/shellcheck.sh
@@ -9,6 +9,12 @@ rwx_shellcheck() {
 		echo ". \"${path}\"" >>"${file}"
 	done
 	rwx_ifs_unset
+	rwx_shellcheck_file "${file}"
+	rwx_remove "${file}"
+}
+
+rwx_shellcheck_file() {
+	local file="${1}"
 	shellcheck \
 		--check-sourced \
 		--enable "all" \
@@ -16,5 +22,13 @@ rwx_shellcheck() {
 		--external-sources \
 		--shell "dash" \
 		"${file}"
-	rm "${file}"
+}
+
+rwx_shellcheck_write() {
+	rwx_file_write ".shellcheckrc" "\
+disable=3043
+enable=all
+external-sources=true
+shell=sh
+"
 }
diff --git a/sh/lint/shfmt.sh b/sh/lint/shfmt.sh
index 097de86..4d6e894 100644
--- a/sh/lint/shfmt.sh
+++ b/sh/lint/shfmt.sh
@@ -1,4 +1,4 @@
 rwx_shfmt() {
-	local root="${1}"
-	shfmt --diff "${root}"
+	local path="${1}"
+	shfmt --diff "${path}"
 }
diff --git a/sh/log.sh b/sh/log/log.sh
similarity index 100%
rename from sh/log.sh
rename to sh/log/log.sh
diff --git a/sh/log/step.sh b/sh/log/step.sh
new file mode 100644
index 0000000..34a5c64
--- /dev/null
+++ b/sh/log/step.sh
@@ -0,0 +1,25 @@
+# ╭───────────────╮
+# │ __ = internal │
+# ╰───────────────╯
+
+# __RWX_BAR_TOP
+# __RWX_BAR_MIDDLE
+# __RWX_BAR_BOTTOM
+
+# __RWX_STEP_LEVEL
+# __RWX_STEP_level_INDEX
+# __RWX_STEP_level_LABEL
+
+# ╭─────────────╮
+# │ _ = private │
+# ╰─────────────╯
+
+_RWX_BOX_DOWN_AND_HORIZONTAL="┬"
+_RWX_BOX_DOWN_AND_LEFT="╮"
+_RWX_BOX_DOWN_AND_RIGHT="╭"
+_RWX_BOX_HORIZONTAL="─"
+_RWX_BOX_LEFT="╴"
+_RWX_BOX_UP_AND_HORIZONTAL="┴"
+_RWX_BOX_UP_AND_LEFT="╯"
+_RWX_BOX_UP_AND_RIGHT="╰"
+_RWX_BOX_VERTICAL="│"
diff --git a/sh/main.sh b/sh/main.sh
old mode 100644
new mode 100755
index 2b3508c..802418f
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -1,24 +1,35 @@
-# ╭───────────╮
-# │ constants │
-# ╰───────────╯
+#! /usr/bin/env sh
+
+# ╭──────┬───────────╮
+# │ main │ constants │
+# ╰──────┴───────────╯
 
 RWX_MAIN_NAME="main.sh"
 RWX_SELF_NAME="rwx"
 
-# ╭───────────╮
-# │ variables │
-# ╰───────────╯
+RWX_SELF_COMMAND="_${RWX_SELF_NAME}_cmd_"
 
-RWX_ROOT_USER="${HOME}/${RWX_SELF_NAME}"
+# ╭──────┬───────────╮
+# │ main │ variables │
+# ╰──────┴───────────╯
+
+RWX_COMMAND_ARGUMENT="${0}"
 RWX_SHELL="$(cat "/proc/${$}/comm")"
-RWX_SYSTEM_ROOT="/usr/local/lib"
+
+RWX_COMMAND_NAME="$(basename "${RWX_COMMAND_ARGUMENT}" |
+	sed "s|^-||")"
+case "${RWX_COMMAND_NAME}" in
+"bash" | "dash" | "sh") unset RWX_COMMAND_NAME ;;
+*) ;;
+esac
+RWX_ROOT_SYSTEM="/usr/local/lib/${RWX_SELF_NAME}"
+RWX_SELF_USER="${HOME}/${RWX_SELF_NAME}"
 
 RWX_MAIN_PATH="${RWX_ROOT_SYSTEM}/${RWX_MAIN_NAME}"
-RWX_ROOT_SYSTEM="${RWX_SYSTEM_ROOT}/${RWX_SELF_NAME}"
 
-# ╭──────╮
-# │ core │
-# ╰──────╯
+# ╭──────┬───────╮
+# │ main │ shell │
+# ╰──────┴───────╯
 
 # test if active shell is in interactive mode
 rwx_shell_interactive() {
@@ -29,7 +40,7 @@ rwx_shell_interactive() {
 }
 
 # ╭──────┬─────╮
-# │ core │ log │
+# │ main │ log │
 # ╰──────┴─────╯
 
 __rwx_log() {
@@ -43,7 +54,7 @@ __rwx_log() {
 }
 
 # ╭──────┬──────╮
-# │ core │ find │
+# │ main │ find │
 # ╰──────┴──────╯
 
 # find directory’s files by extension
@@ -70,7 +81,7 @@ rwx_find_shell() {
 }
 
 # ╭──────┬─────╮
-# │ core │ ifs │
+# │ main │ ifs │
 # ╰──────┴─────╯
 
 rwx_ifs_set() {
@@ -85,20 +96,19 @@ rwx_ifs_unset() {
 }
 
 # ╭──────┬────────╮
-# │ core │ source │
+# │ main │ source │
 # ╰──────┴────────╯
 
 rwx_source() {
 	local path="${1}"
 	[ -d "${path}" ] ||
 		return 1
-	local count module modules
-	modules="$(rwx_find_shell "${path}" "${RWX_MAIN_NAME}")"
-	rwx_ifs_set
+	local count module
 	count=0
 	__rwx_log "" \
 		". ${path}"
-	for module in ${modules}; do
+	rwx_ifs_set
+	for module in $(rwx_find_shell "${path}" "${RWX_MAIN_NAME}"); do
 		count=$((count + 1))
 		__rwx_log "$(printf "%02d" "${count}") ${module%.sh}"
 		module="${path}/${module}"
@@ -108,9 +118,9 @@ rwx_source() {
 	rwx_ifs_unset
 }
 
-# ╭──────┬──────╮
-# │ core │ main │
-# ╰──────┴──────╯
+# ╭──────╮
+# │ main │
+# ╰──────╯
 
 # run initial steps
 rwx_main() {
@@ -120,20 +130,15 @@ rwx_main() {
 		return 1
 	fi
 	# user root
-	rwx_source "${RWX_ROOT_USER}"
-	# run interactive extras
-	if rwx_shell_interactive; then
-		# check format
-		rwx_log
-		rwx_shfmt "${RWX_ROOT_SYSTEM}"
-		# check syntax
-		rwx_log
-		rwx_shellcheck "${RWX_ROOT_SYSTEM}"
-		# help
-		rwx_log
-		rwx_self_help
+	rwx_source "${RWX_SELF_USER}"
+	# context / command
+	if [ -n "${RWX_COMMAND_NAME}" ]; then
+		"${RWX_SELF_COMMAND}${RWX_COMMAND_NAME}" "${@}"
+	# context / shell
+	else
+		rwx_self_init
 	fi
 }
 
 # run main function
-rwx_main
+rwx_main "${@}"
diff --git a/sh/python.sh b/sh/python.sh
new file mode 100644
index 0000000..44ea181
--- /dev/null
+++ b/sh/python.sh
@@ -0,0 +1,14 @@
+# ╭────────╮
+# │ python │
+# ╰────────╯
+
+# ╭────────┬──────╮
+# │ python │ venv │
+# ╰────────┴──────╯
+
+rwx_python_venv() {
+	local path="${1}"
+	[ -d "${path}" ] || return 1
+	export VIRTUAL_ENV="${path}" && \
+		export PATH="${VIRTUAL_ENV}/bin:${PATH}"
+}
diff --git a/sh/rescue/hetzner.sh b/sh/rescue/hetzner.sh
index 9d22847..24d6bd0 100644
--- a/sh/rescue/hetzner.sh
+++ b/sh/rescue/hetzner.sh
@@ -63,6 +63,8 @@ rwx_rescue_wipe_0_init_hetzner_8_8() {
 	for device in "${@}"; do
 		members="${members} ${device}2"
 	done
+	# LATER alternative
+	# shellcheck disable=SC2086
 	rwx_fs_raid_create \
 		"boot" "00000000:00000000:00000000:00000002" ${members}
 	#
@@ -87,6 +89,8 @@ rwx_rescue_wipe_0_init_hetzner_8_8() {
 	for device in "${@}"; do
 		members="${members} ${device}1"
 	done
+	# LATER alternative
+	# shellcheck disable=SC2086
 	rwx_fs_raid_create \
 		"crypt" "00000000:00000000:00000000:00000001" ${members}
 	# encrypt
diff --git a/sh/self.sh b/sh/self.sh
index 4220366..732e9c2 100644
--- a/sh/self.sh
+++ b/sh/self.sh
@@ -1,4 +1,57 @@
-# get functions from file
+# meta doc
+rwx_doc() {
+	local name="${1}"
+	[ -n "${name}" ] || return
+	local doc line module
+	rwx_ifs_set
+	for module in $(rwx_find_shell "${RWX_ROOT_SYSTEM}"); do
+		while read -r line; do
+			case "${line}" in
+			"#"*) doc="${doc}${line}" ;;
+			"${name}() {")
+				echo "${doc}"
+				return
+				;;
+			*) doc="" ;;
+			esac
+		done <"${RWX_ROOT_SYSTEM}/${module}"
+	done
+	rwx_ifs_unset
+}
+
+# ╭──────┬───────╮
+# │ self │ check │
+# ╰──────┴───────╯
+
+# check source code
+rwx_self_check() {
+	# check format
+	rwx_log
+	rwx_shfmt "${RWX_ROOT_SYSTEM}"
+	# check syntax
+	rwx_log
+	rwx_shellcheck "${RWX_ROOT_SYSTEM}"
+}
+
+# ╭──────┬──────────╮
+# │ self │ commands │
+# ╰──────┴──────────╯
+
+# get commands from root
+rwx_self_commands() {
+	grep \
+		--directories "recurse" \
+		--no-filename \
+		"^${RWX_SELF_COMMAND}" "${RWX_ROOT_SYSTEM}" |
+		cut --delimiter "(" --fields 1 |
+		sed "s|^${RWX_SELF_COMMAND}||"
+}
+
+# ╭──────┬───────────╮
+# │ self │ functions │
+# ╰──────┴───────────╯
+
+# get functions from root
 rwx_self_functions() {
 	grep \
 		--directories "recurse" \
@@ -7,6 +60,10 @@ rwx_self_functions() {
 		cut --delimiter "(" --fields 1
 }
 
+# ╭──────┬──────╮
+# │ self │ help │
+# ╰──────┴──────╯
+
 # output help message
 rwx_self_help() {
 	rwx_log \
@@ -14,3 +71,92 @@ rwx_self_help() {
 		" a__… = aliases" \
 		" u__… = user"
 }
+
+# ╭──────┬──────╮
+# │ self │ init │
+# ╰──────┴──────╯
+
+rwx_self_init() {
+	# run interactive extras
+	if rwx_shell_interactive; then
+		# help
+		rwx_log
+		rwx_self_help
+	fi
+}
+
+# ╭──────┬─────────╮
+# │ self │ install │
+# ╰──────┴─────────╯
+
+_rwx_cmd_rwx_install() { rwx_self_install "${@}"; }
+rwx_self_install() {
+	local target="${1}"
+	local command file root
+	# code
+	if [ -n "${target}" ]; then
+		root="${target}${RWX_ROOT_SYSTEM}"
+		rwx_remove "${root}"
+		cp --recursive "${RWX_ROOT_SYSTEM}" "${root}"
+	fi
+	# commands
+	root="${target}/usr/local/bin"
+	for command in $(rwx_self_commands); do
+		file="${root}/${command}"
+		rwx_remove "${file}"
+		rwx_link "${file}" "${RWX_MAIN_PATH}"
+	done
+	# sh
+	file="${target}/etc/profile.d/${RWX_SELF_NAME}.sh"
+	rwx_remove "${file}"
+	rwx_file_write "${file}" "\
+export ENV=\"${RWX_MAIN_PATH}\"
+"
+	# bash
+	file="${target}/etc/bash.bashrc"
+	rwx_remove "${file}"
+	rwx_link "${file}" "${RWX_MAIN_PATH}"
+}
+
+# ╭──────┬────────╮
+# │ self │ subset │
+# ╰──────┴────────╯
+
+rwx_self_subset() {
+	local argument path
+	for argument in "${@}"; do
+		path="${RWX_ROOT_SYSTEM}/${argument}"
+		if [ -d "${path}" ]; then
+			local file
+			for file in $(rwx_find_shell "${path}"); do
+				echo "${argument}/${file}"
+			done
+		elif [ -f "${path}" ]; then
+			echo "${argument}"
+		fi
+	done
+}
+
+# ╭──────┬───────╮
+# │ self │ write │
+# ╰──────┴───────╯
+
+rwx_self_write() {
+	local target="${1}"
+	if [ -n "${target}" ]; then
+		shift
+		local file text
+		text="#! /usr/bin/env sh
+"
+		rwx_ifs_set
+		for file in $(rwx_self_subset "${@}"); do
+			text="${text}
+$(cat "${RWX_ROOT_SYSTEM}/${file}")
+"
+		done
+		rwx_ifs_unset
+		rwx_file_write "${target}" "${text}"
+		rwx_shfmt "${target}"
+		rwx_shellcheck_file "${target}"
+	fi
+}
diff --git a/sh/shell.sh b/sh/shell.sh
index 561fcdd..7e56658 100644
--- a/sh/shell.sh
+++ b/sh/shell.sh
@@ -71,7 +71,7 @@ rwx_shell_prompt() {
 	id="$(id --user)"
 	local path="${PWD}"
 	local user="${USER}"
-	local view="└ "
+	local view="╰ "
 	# code
 	if [ "${code}" -ne 0 ]; then
 		view="${view}${RWX_COLOR_GREEN}"
@@ -96,7 +96,7 @@ rwx_shell_prompt() {
 	# new
 	view="${view}\\n"
 	# frame
-	view="${view}${RWX_COLOR_DEFAULT}┌ "
+	view="${view}${RWX_COLOR_DEFAULT}╭ "
 	# user
 	if [ "${id}" -eq 0 ]; then
 		view="${view}${RWX_COLOR_GREEN}"
@@ -114,12 +114,3 @@ rwx_shell_prompt() {
 	# print
 	printf "%b" "${view}"
 }
-
-rwx_shell_setup() {
-	# shell
-	echo "export ENV=\"${ENV}\"" >"/etc/profile.d/${RWX_SELF_NAME}.sh"
-	# bash
-	local file="/etc/bash.bashrc"
-	rm --force --recursive "${file}"
-	ln --symbolic "${ENV}" "${file}"
-}
diff --git a/sh/tmux.sh b/sh/tmux.sh
new file mode 100644
index 0000000..d9813e1
--- /dev/null
+++ b/sh/tmux.sh
@@ -0,0 +1,264 @@
+# ╭──────┬───────╮
+# │ tmux │ setup │
+# ╰──────┴───────╯
+
+rwx_tmux_setup() {
+	local file
+	file="${HOME}/.tmux.conf"
+	rwx_file_write "${file}" "\
+# ╭────────╮
+# │ option │
+# ╰────────╯
+
+# empty name for windows
+set-option -g automatic-rename-format '#{pane_current_command}'
+set-option -g automatic-rename on
+
+# first index number
+set-option -g base-index 1
+
+# display duration
+set-option -g display-time 1536
+
+# extend history limit
+set-option -g history-limit 1048576
+
+# style for messages
+set-option -g message-style bg=red,fg=white
+
+# activity monitoring
+set-window-option -g monitor-activity on
+
+# silence monitoring
+set-window-option -g monitor-silence 0
+
+# enable mouse actions
+set-option -g mouse on
+
+# prefix with ^B or F12
+set-option -g prefix C-b
+set-option -g prefix2 F12
+
+# renumber windows after closing one
+set-option -g renumber-windows on
+
+# enable title
+set-option -g set-titles on
+
+# set title to working directory
+set-option -g set-titles-string '\
+#{session_name}\
+ - \
+#{window_index}∕#{session_windows} #{window_name}\
+ - \
+#{pane_index}∕#{window_panes} #{pane_current_command}\
+'
+
+# ╭────────┬──────╮
+# │ option │ pane │
+# ╰────────┴──────╯
+
+# first index number
+set-option -g pane-base-index 1
+
+# ╭────────┬──────┬────────╮
+# │ option │ pane │ border │
+# ╰────────┴──────┴────────╯
+
+# active style
+set-option -g pane-active-border-style fg=green
+
+# regular style
+set-option -g pane-border-style fg=blue
+
+# ╭────────┬────────╮
+# │ option │ status │
+# ╰────────┴────────╯
+
+# status lines
+set-option -g status 3
+
+# background color
+set-option -g status-bg '#0D0D0D'
+
+# foreground color
+set-option -g status-fg white
+
+# line 1
+set-option -g status-format[0] '\
+#{W:\
+#[bg=##202020] #[bg=##303030]\
+#{?window_zoomed_flag,#[fg=magenta][, }\
+#[fg=yellow]#{window_index}\
+#{?window_zoomed_flag,#[fg=magenta]], }\
+ \
+#{?window_active,#[fg=green],\
+#{?window_activity_flag,#[fg=red],#[fg=blue]}}\
+#{window_name}\
+#[bg=##303030] #[bg=##202020] \
+#[bg=default] \
+}\
+#[align=right]\
+#[bg=##202020] #[bg=##303030] \
+#[fg=yellow]%H:%M:%S\
+#[bg=##303030] #[bg=##202020]\
+#{?client_prefix,#[fg=green]p, }\
+'
+
+# line 2
+set-option -g status-format[1] '\
+#{S:\
+#[bg=##202020] #[bg=##303030] \
+#{?session_many_attached,#[fg=red],\
+#{?session_attached,#[fg=magenta],#[fg=blue]}}\
+#{session_name}\
+#[bg=##303030] #[bg=##202020] \
+#[bg=default] \
+}\
+#[fg=yellow]→ #[fg=green]#{session_name} \
+#[align=right]\
+#[bg=##202020] #[bg=##303030] \
+#[fg=yellow]%Y-%m-%d\
+#[bg=##303030] #[bg=##202020] \
+'
+
+# line 3
+set-option -g status-format[2] '\
+#[fg=cyan]#{pane_current_path}\
+#[align=right]\
+#[bg=##202020] #[bg=##303030] \
+#[fg=yellow]#{host}\
+#[bg=##303030] #[bg=##202020] \
+'
+
+# line 4
+set-option -g status-format[3] '\
+#{P:\
+#[bg=##202020] #[bg=##303030] \
+#[fg=yellow]#{pane_index}\
+ \
+#{?pane_active,#[fg=green],#[fg=blue]}\
+#{pane_current_command}\
+#[bg=##303030] #[bg=##202020] \
+#[bg=default] \
+}\
+#[align=right]\
+#[bg=##202020] #[bg=##303030] \
+#{?uid,#[fg=green],#[fg=red]}\
+#{user}\
+#[bg=##303030] #[bg=##202020] \
+'
+
+# line 5
+set-option -g status-format[4] '\
+#{P:\
+#[bg=##202020] #[bg=##303030] \
+#[fg=yellow]#{pane_index}\
+ \
+#{?pane_active,#[fg=green],#[fg=blue]}\
+#{pane_width}×#{pane_height}\
+#[bg=##303030] #[bg=##202020] \
+#[bg=default] \
+}\
+#[align=right]\
+#[bg=##202020] #[bg=##303030] \
+#[fg=green]#{window_width}×#{window_height}\
+#[bg=##303030] #[bg=##202020] \
+'
+
+# refresh period
+set-option -g status-interval 1
+
+# bar location
+set-option -g status-position bottom
+
+# ╭─────╮
+# │ key │
+# ╰─────╯
+
+# detach client
+bind-key -n F6 detach-client
+
+# new window
+bind-key -n F2 new-window
+
+# select pane
+bind-key -n C-S-Down select-pane -D
+bind-key -n C-S-Left select-pane -L
+bind-key -n C-S-Right select-pane -R
+bind-key -n C-S-Up select-pane -U
+
+# status lines
+bind-key -n C-F10 set-option -g status off
+bind-key -n C-F1 set-option -g status on
+bind-key -n C-F2 set-option -g status 2
+bind-key -n C-F3 set-option -g status 3
+bind-key -n C-F4 set-option -g status 4
+bind-key -n C-F5 set-option -g status 5
+
+# switch session
+bind-key -n M-Down switch-client -n
+bind-key -n M-Up switch-client -p
+
+# switch window
+bind-key -n M-Left previous-window
+bind-key -n M-Right next-window
+
+# ╭─────┬────────╮
+# │ key │ prefix │
+# ╰─────┴────────╯
+
+# rename
+bind-key C-s command-prompt { rename-session '%%' }
+bind-key C-w command-prompt { rename-window '%%' }
+
+# split window
+bind-key h split-window -h
+bind-key v split-window -v
+
+# toggle mouse
+bind-key t set-option -g mouse \\; display-message 'mouse = #{mouse}'
+
+# reload configuration
+bind-key r source-file ${file} \\; display-message 'source-file ${file}'
+
+# swap window
+bind-key M-Left swap-window -t -1
+bind-key M-Right swap-window -t +1
+
+#                                           ╭─────────────╮
+#                                           │ default     │
+#                     ╭───────────┬─────────┼─────┬───────┤
+#                     │ -n        │ F12     │ -n  │ C-b   │
+# ╭───────────────────┼───────────┼─────────┼─────┼───────┤
+# │ command-prompt    │           │         │     │ :     │
+# │ copy-mode         │           │         │     │ PPage │
+# │ detach-client     │           │         │     │ d     │
+# │ new-session       │           │         │     │       │
+# │ new-window        │ F2        │         │     │ c     │
+# │ next-window       │ M-Right   │         │     │ n     │
+# │ previous-window   │ M-Left    │         │     │ p     │
+# │ rename-session    │           │ C-s     │     │       │
+# │ rename-window     │           │ C-w     │     │       │
+# │ resize-pane -Z    │           │         │     │ z     │
+# │ select-pane -D    │ C-S-Down  │         │     │       │
+# │ select-pane -L    │ C-S-Left  │         │     │       │
+# │ select-pane -R    │ C-S-Right │         │     │       │
+# │ select-pane -U    │ C-S-Up    │         │     │       │
+# │ set -g mouse      │           │ t       │     │       │
+# │ set -g status off │ C-F10     │         │     │       │
+# │ set -g status on  │ C-F1      │         │     │       │
+# │ set -g status 2   │ C-F2      │         │     │       │
+# │ set -g status 3   │ C-F3      │         │     │       │
+# │ set -g status 4   │ C-F4      │         │     │       │
+# │ set -g status 5   │ C-F5      │         │     │       │
+# │ source-file       │           │ r       │     │       │
+# │ split-window -h   │           │ h       │     │ %     │
+# │ split-window -v   │           │ v       │     │ \"     │
+# │ swap-window -t -1 │           │ M-Left  │     │       │
+# │ swap-window -t +1 │           │ M-Right │     │       │
+# │ switch-client -n  │ M-Down    │         │     │       │
+# │ switch-client -p  │ M-Up      │         │     │       │
+# ╰───────────────────┴───────────┴─────────┴─────┴───────╯
+"
+}
diff --git a/sh/util.sh b/sh/util.sh
index 7d9cc3f..cbcd67a 100644
--- a/sh/util.sh
+++ b/sh/util.sh
@@ -1,3 +1,35 @@
+rwx_file_append() {
+	local file="${1}"
+	local text="${2}"
+	if [ -n "${file}" ]; then
+		printf "%s" "${text}" >>"${file}"
+	fi
+}
+
+rwx_file_empty() {
+	local file="${1}"
+	if [ -n "${file}" ]; then
+		rwx_file_write "${file}" ""
+	fi
+}
+
+rwx_file_write() {
+	local file="${1}"
+	local text="${2}"
+	if [ -n "${file}" ]; then
+		printf "%s" "${text}" >"${file}"
+	fi
+}
+
+rwx_link() {
+	local link="${1}"
+	local target="${2}"
+	ln \
+		--symbolic \
+		"${target}" \
+		"${link}"
+}
+
 rwx_list_block_devices() {
 	lsblk \
 		--noempty \
@@ -28,6 +60,13 @@ rwx_read_secret() {
 	unset secret
 }
 
+rwx_remove() {
+	rm \
+		--force \
+		--recursive \
+		"${@}"
+}
+
 rwx_warn_wipe() {
 	local tmp
 	rwx_list_block_devices