Shell Programming and Scripting

Hi There,

I have 3 scripts that have to be run one after the other. All 3 scripts are dependent of the other. Now, If I am about to run the second script, assuming that the first script has already been run, can I get the status of the first script.

The problem is that, My second script has to run only when my first script has excuted successfully

If this can be done, give me a snippet of doing this

Thanx in advance

In the good ol' /bin/sh shell, $? holds the status of the just executed script.

In unix, 0 denotes a success.

Suppose your scripts are a.sh, b.sh and c.sh and you need to run them in the order a, b, c; then this is what you should be doing.

Code:

#! /bin/sh
sh a.sh
if [ $? -eq 0 ] ; then
 sh b.sh
  if [ $? -eq 0 ] ; then
   sh c.sh
  else
   echo "b failed"
   exit
  fi;
  else
 echo "a failed"
  exit
fi;

Havent tested it yet. Let me know if you hit any roadblocks.

Vino

Thanx,
It is ok if u I am executing the scripts within the script. What if I run the scripts independently and not within a single script

sh a.sh

sh b.sh

sh c.sh

What is the possible way getting the exit status of a.sh before executing b.sh?

Thanx in advance

Let me get this clear.

You want the scripts to run independently or are they dependent on the other scripts ?

If they are dependent, then i think you need to have a script which outsources the scripts separately. In this case, you run the main script and then go about your work. It will continue on its own.

If they are independent, then I think you come into the picture. You can see for your self whether a is successful or not and then go ahead likewise for b and c.

Also, $? holds the exit status of executed command be it any command

vino

pathanjalireddy,

Another thought !

If you dont want to one script handling all three scripts, then in each of your scripts you will have to test for the exit status.

Say in a.sh you have commands which can throw a non-0 exit status. For each of these commands you will/might (as per your requirements) have to check the exit status given by $?. And then accordingly, proceed ahead.

Vino

use temp marker files ... at the end of your script create the marker file ... look for the marker file at the start of the next script ...

Code:

a.sh
...
...
touch /tmp/a.complete

b.sh
#! /bin/ksh
[ ! -f /tmp/a.complete ] && exit
...
...
touch /tmp/b.complete

c.sh
#! /bin/ksh
[ ! -f /tmp/b.complete ] && exit
...
...
touch /tmp/c.complete

Just Ice,

What happens, the next time you run a.sh and it fails.

/tmp/a.complete would still remain there. And b.sh would run.

Rather, once you enter b.sh and check for the existence of /tmp/a.complete, you should remove the file before carrying on with b.sh.

Vino