waitdone - A simple bash script to sleep until another proccess is done.

waitdone.sh

#!/bin/bash
# waitdone
###############################################################################
# A simple bash script to sleep until another process is done. This is handy
# if you have an executable running in another tab/session/etc and want to
# automatically run a dependent command when the first finishes, or if you
# want to queue up another command that will make use of the same system
# resources being locked by the currently executing process.
###############################################################################
# VERSION HISTORY
# 2018-06-02   1.0	First Public Release
###############################################################################
#set -u

# Parse arguments for how many times to confirm a process has stopped,
# and how long to wait between checks.
#########
if [[ $# -lt 1 || $# -gt 3 ]]; then
	echo "Usage: $0 <proc_name> [repeat count] [recheck_time=5]"
	exit
fi
if [[ $# -gt 1 ]]; then
	repeatCount=$(("$2"+1))
else
	repeatCount=1
fi
if [[ $# -gt 2 ]]; then
	recheckSleepTime=$(("$3"+0))
	if [[ $recheckSleepTime -lt 1 ]]; then
		recheckSleepTime=1
	fi
else
	recheckSleepTime=5
fi

OIFS="$IFS"
IFS=$'\n'

function printLonely() {
	printf "\r%-${COLUMNS}s" "$1"
}

# Start the process search counter
#########
startTime=$(date +"%s")
while [[ $repeatCount -gt 0 ]]; do 
	# get a list of running processes
	processes=($(ps a))
	found=false
	# for each entry line, see if it matches our search term
	# rejecting all calls to this tool that will also show up in the list.
	for process in ${processes[*]}; do
		echo "$process" | grep -v "$0" | grep "$1" >/dev/null
		RETCODE=$?
		if [[ $RETCODE -eq 0 ]]; then
			found=true
			break
		fi
	done 

	if [[ $found == false ]]; then
		repeatCount=$(($repeatCount-1))
	fi

	if [[ $repeatCount -eq 0 ]]; then
		printf "\tdone!\n"
		exit
	else
		# If we haven't found it, then update a timestamp to show the user how
		# long we have been waiting, and sleep until the next check.
		timeDelta=$(($(date +"%s")-$startTime))
		sleepTime="$(date --date=@$timeDelta -u +"%H:%M:%S")"
		printLonely "sleep... ($sleepTime)"
		sleep $recheckSleepTime
	fi
done