#!/usr/bin/env bash
# script: watch
# author: Mike Smullin <mike@smullindesign.com>
# license: GPLv3
# description:
# watches the given path for changes
# and executes a given command when changes occur
# usage:
# watch <path> <cmd...>
#
path=$1
shift
cmd=$*
sha=0
update_sha() {
sha=`ls -lR --time-style=full-iso $path | sha1sum`
}
update_sha
previous_sha=$sha
build() {
echo -en " building...\n\n"
$cmd
echo -en "\n--> resumed watching."
}
compare() {
update_sha
if [[ $sha != $previous_sha ]] ; then
echo -n "change detected,"
build
previous_sha=$sha
else
echo -n .
fi
}
trap build SIGINT
trap exit SIGQUIT
echo -e "--> Press Ctrl+C to force build, Ctrl+\\ to exit."
echo -en "--> watching \"$path\"."
while true; do
compare
sleep 1
done
watch is a linux bash script to monitor file modification recursively and execute bash commands as changes occur
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