diff --git a/sync.sh b/sync.sh
index 4ae5a97..3a30d6c 100755
--- a/sync.sh
+++ b/sync.sh
@@ -1,20 +1,20 @@
-#! /bin/bash
-FILE="$(realpath "${BASH_SOURCE[0]}")"
-DIRECTORY="$(dirname "${FILE}")"
+#! /usr/bin/env bash
+BASH_FILE="$(realpath "${BASH_SOURCE[0]}")"
+BASH_ROOT="$(dirname "${BASH_FILE}")"
 
-OUT='output'
+OUTPUT='output'
 
 function rs { echo; \
 echo "→ ${2} @ ${3} : ${1}"; \
 ssh -o 'LogLevel Error' -p ${1} "${2}@${3}" \
-df -h .
+df --human-readable .
 }
 function rs {
 echo "→ ${2} @ ${3} : ${1}"
 rsync --verbose --progress \
 --rsh "ssh -o 'LogLevel Error' -p ${1}" \
 --archive --checksum --delete-before \
-"${DIRECTORY}/${OUT}/" \
+"${BASH_ROOT}/${OUTPUT}/" \
 "${2}@${3}:${4}/" \
 > /dev/null
 }