Invoking shell script from shell script

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# 1  
Old 12-03-2001
Invoking shell script from shell script

I am trying to invoke another shell script from a shell script and I am not sure of how to check the return code of the called script. Please help.

# 2  
Old 12-03-2001
if your just looking for success just call the other script in an if statemend:

if $HOME/scripts/imi_reserve
then :
else DoErrorMessage "Call to imi_reserve failed in daily_deployment_ext, retcd = $?"
# 3  
Old 12-03-2001

I am not just checking for if the script ran or not. If I need to check the return code from the invoked program. Is this how I would do it ?

Have an exit code code specified for each action in the called program and then when I call it and check $? for the error code ?

Please correct me if I am wrong.

# 4  
Old 12-04-2001
That looks about right to me...
To paraphrase:

case $? in
0) Do something ;;
*) Do something else ;;

if [ "$?" -ne "0" ]; then
freak out here

There are several different ways of doing what you need.

Hope that helps.
# 5  
Old 12-05-2001
Network read


I tried code like this

echo " Enter user name :\c"
read resp

if (test $? -ne 0)

The above condition is not working if there is
a terminal hungup happens.
when I run the shell script it echoes
Enter user name :

At that time, when the user is not able to enter due to some
reason and the terminal is hungup. Still the process is running
without exiting.

How can we catch this kind of error ? Do we need to use
any signals ?

# 6  
Old 12-05-2001
A terminal hangup signal is a SIGHUP. See the trap man page for info on catching and handling signals in Bourne and Korn shell. See onintr for C shell.
# 7  
Old 12-06-2001
Re: read

if (test $? -ne 0)
What that's doing (I think), is evaluating if the "test " command was successful, which it will be any time your read statement succeeds.

And actually, I don't think you need the test command in there at all...
if [ "$?" -ne "0" ]; then

Or also, assuming you're using a fairly modern sh, you could even save a line of code and try:

read resp || exit 1

It'll simply exit (with status -ne 0) if the read statement fails. (BTW, those are two pipe symbols, no space inbetween)
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