bash_lab1

#!/bin/bash


get_cmd(){
    ps --no-headers -p $(pidof "$1") -o cmd
}

get_pid(){
    if [[ $(pidof "$1") =~ ^[0-9]+$ ]]; then
        return 0
    else
        return 1
    fi
}

# Read initial data from user.
until [[ $sec =~ ^[0-9]+$ ]]; do
    read -p "check period (sec): " sec
done

until ( get_pid "$name" ); do
    read -p "process name: " name
done

# Get cmdline by process name.
cmd=$(get_cmd "$name")
[ -z "$cmd" ] && echo "ERROR: cmdline by programm name $name is not found!"

while true ; do
    # ( get_pid "$name" ) || $cmd
    if ( get_pid "$name" ); then
        echo "Waiting, sleep for $sec sec..."
    else
        echo 'Run cmd...'
        $cmd
    fi
    sleep $sec
done