Very Computer

Does anyone know how to trap errors from within piped commands in KSH???

example:

ls -l /non-existent-dir | ls -l /existing-dir
echo $?

I want to find out if the first command failed or if the second one failed.

I tried:

ls -l /non-existent-dir 2> err.file | ls -l /existing-dir 2>> err.file
if [ -s err.file ]
then
  echo "ERROR: `cat err.file`"
  exit 1
fi

I think this is rather ugly.

Thanks,

Rudy

Yes.  A search through the archives of this group can show you
several possibilites.

Quote:>example:

>ls -l /non-existent-dir | ls -l /existing-dir
>echo $?

>I want to find out if the first command failed or if the second one failed.

Well, it's kinda weird trying to pipe input to an "ls", but
we'll ignore that detail for now...

One solution is of the form:
  if ! ls -l /non-existent-dir; then
    echo "process 1 failed" 1>&2
  fi | if ! ls -l /existing-dir; then
    echo "process 2 failed" 1>&2
  fi

Quote:>ls -l /non-existent-dir 2> err.file | ls -l /existing-dir 2>> err.file
>if [ -s err.file ]
>then
>  echo "ERROR: `cat err.file`"
>  exit 1
>fi

>I think this is rather ugly.

It also doesn't solve the stated problem.

                --Ken Pizzini