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Full Discussion: Breaking out of a pipe
Top Forums Shell Programming and Scripting Breaking out of a pipe Post 302287115 by oinkl on Thursday 12th of February 2009 10:14:37 PM
Old 02-12-2009
Fails as in, grep doesn't find any results.

Then output an error message such as, "User is not logged on"

Quote:
why use grep if you still want to pass everything else to "some-other-commands" ?
Er... why not? Is there another command I can use?

I don't want to run things twice, because there are further error conditions in the subsequent set of commands. The idea is, I have a long sequence of commands, connected with pipes. If the execution fails at grep because user is not logged on, then output an error message. After grep, I retrieve the tty(s) of the user(from the grep'ed results), and if all his ttys are non-writeable, output another error message, and so on and so forth. There are multiple error conditions in the commands, and if it fails at any point, I would like to know where it fails, and output an appropriate error message.
 

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LEARN ABOUT V7

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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