Bash Shell Find Out If A Command Exists On UNIX / Linux System ($PATH) OR Not

if_cmd_exist

#!/bin/bash
# POSIX command lookup example
CMDS="tar /usr/bin/mysqldump /path/to/other/command"
 
for i in $CMDS
do
  # command -v will return >0 when the $i is not found
	command -v $i >/dev/null && continue || { echo "$i command not found."; exit 1; }
done
 
# add rest of the script as we found all bins in $PATH
echo "Starting backup...."