Very Computer

  The question is a straight forward one.  How does
one send to standard error from a shell script?
All the echo's and print's and such go to standard
out.
  What I would like is for my own shell script warning
messages to be sent to standard error and not JUST echo'ed
to the user.
  Thank you.

                           Eric J. Ostrander

                           Senior Scientific Programmer
                           Johns Hopkins University

echo "WARNING" >&2

If you want to redirect stderr from all commands to a file, use:

exec 2>filename
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:   The question is a straight forward one.  How does
: one send to standard error from a shell script?
: All the echo's and print's and such go to standard
: out.
:   What I would like is for my own shell script warning
: messages to be sent to standard error and not JUST echo'ed
: to the user.
:   Thank you.

Bourne shell:
echo "This is an error" 2> error.file
Standard in is file descriptor 0
Standard out is file descriptor 1
Standard error is file descriptor 2, thus the 2> above

Or, you can set up the script to trace all functions, including errors and
all step as they occure, with shell substitutions with:

        exec 2> /tmp/sh.err
        set -x

A the begining of the shell script.
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print -u2 "<your error message here>"

The "-u2" tells the print statement to put the message onto STDERR.

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  echo "seterr test string" >$2

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Quote:>In bourne (/bin/sh):

>  echo "seterr test string" >$2

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