在bash脚本中如何在这种情况下执行多个if，else语句？

Question

Right now I am running a few programs with bash scripts (with Cygwin).

Basically what I am doing is after the program is starting, a loop is ran that checks that the program is still running.

I was doing:

while true
do
    if [ "$(ps -W | grep -w name | gawk '{print $8,$9}' | gawk -F \\ '{print $4}')" == 'program' ];then 
        sleep 1
    else
        "start program" (whatever is needed here)
    fi
done

But I started to realize having such a script multiple times is just causing unnecessary system resources to be used.

I tried doing an if then, elif, but it never goes past the first if.

I need it to go "alright the first if is negative, try the next, go to the end, start over".

Here is the copy of my script and I forgot to say I was using Cygwin but that really doesn't change anything cause it seems to still use normal bash scripting just maybe different paths to start files. http://pastebin.com/s8ZdPQMn and yes the h. is not there I just can't seem to edit the pastebin.

My overall plan is check that first SRPro is running, check the next, etc, only triggering if it's detected one is not running.

EDIT: I solved it. Not exactly sure why but in my original single file per program, gawk printing $4 at the end gave me what I wanted, but for some reason when doing it this way, it turned to $5. So changing $4 to $5 made the script work.

EDIT: One really strange issue though is, it will work minutes on end, then all the sudden get confused at times, and start 7 copies of one program or something. Also it can be random on which it starts.

Answer 1

You might find the wait command (try help wait from a bash prompt) useful. It's unclear exactly what you want, but as an example, here's a basic respawn function:

$ respawn () {
>   while true
>   do
>     "${@}" &
>     wait ${!}
>     echo "respawning ..."
>   done
> }
$ respawn some_program arg1 arg2 etc