bash 쉘

#!/bin/bash

# Watch a bashfile and run it if changed
function bash_monitor () {

if [[ -z "$1" ]]; then
echo "usage: bash_monitor "
exit 1
fi
local file="$1"
local tmp1="$HOME/.tmp_bash_monitor_1"
local tmp2="$HOME/.tmp_bash_monitor_2"

# create temporary files to compare status
touch "$tmp1" "$tmp2"

while true; do
ls -l "$file" > "$tmp1"

diff "$tmp1" "$tmp2" > /dev/null \
|| {
echo
echo '[BASH MONITOR] File changed.'
echo '----------------------------'
# run bash with parameters from second if changed
source "$file" "${@:2}"
}

cp "$tmp1" "$tmp2"

sleep 1

done

}

bash_monitor "$@"

한줄한줄 하는 일좀 알려주실수있을까요

혹은 이것을 기존파일을 신규파일로 고치개끔 바꿀수있나요?