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Full Discussion: Need help in writing the shell script
Top Forums Shell Programming and Scripting Need help in writing the shell script Post 302242524 by era on Thursday 2nd of October 2008 06:05:00 AM
Old 10-02-2008
The use of temporary files can be avoided. The main part we can't guess is which audit daemon you are using and how to start and stop it.

Code:
if who | awk '$1 == "gayathri" { exit 0 } END [ exit 1 }'
then
  echo logged in
else
  echo not
fi

The use of exit within the awk script is a bit arcane; if that bothers you, perhaps you could simply try

Code:
if who | grep '^gayathri ' >/dev/null; then ...

to look for "gayathri" at beginning of line, followed by a space. The redirection to >/dev/null is because you don't really actually want to see the output, you just care whether there was a match (in which case grep returns a true value) or not.
Last edited by era; 10-02-2008 at 07:06 AM.. Reason: Explain redirect to /dev/null
 

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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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