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Full Discussion: Problem with exit status
Top Forums Shell Programming and Scripting Problem with exit status Post 84723 by diganta on Wednesday 28th of September 2005 08:25:06 AM
Old 09-28-2005
Problem with exit status
Hi,

Consider the output of the following commands:

case1)
-------
# ifconfig -a | grep "UP" | grep uplink0:1
# echo $?

Output is: 0

case2
------
# ifconfig -a | grep "UP" | grep uplink0:1; echo $?

Output is: 1

In case2 we got the exit code as 1, which is the actual exit code.
Why did we not get the actual exit code in case1?

What is the difference between executing two different command at the same time (as in case 2) and one after the other (as in case 1)? In both the cases the commands will get executed in the same sequence.

Any help will be highly appreciated.

Thanks.
 

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LEARN ABOUT ULTRIX

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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