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Full Discussion: IF $USER is not in this list of users, then do this
Top Forums Shell Programming and Scripting IF $USER is not in this list of users, then do this Post 302361986 by Casey on Wednesday 14th of October 2009 03:43:14 PM
Old 10-14-2009
$? gives you the exit status of the latest command executed. In this case if this

Code:
echo 'smitha, lucyb, johnk' | grep -q ${USER}

is successfully done, then $? will be 0, else it will be 1 (or any other value between 1 and 255). Then you use that value to check if the users was found or not.
 

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LEARN ABOUT MINIX

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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