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Full Discussion: Need help in a simple shell script
Top Forums Shell Programming and Scripting Need help in a simple shell script Post 302142388 by cfajohnson on Thursday 25th of October 2007 11:26:41 PM
Old 10-26-2007
Quote:
Originally Posted by raghav1982
Hi All

I have requirement to write a shell script which would look for the userid which is logged in , and once the User id is found i would delete certain
lines from a parameter file ..
...
This is my sample thing i am doing (very Simple)

a=ps -o user | grep -v user | uniq #instance name is cool

a = ps -o user | grep -v USER | uniq

To store the output of a command in a variable, use command substitution:

Code:
a=$( ps -o user | grep -v USER | uniq )

Quote:
if [ "$a" = "cool" ];then
echo " This is cool"
else
echo " Not Equal"
fi

You don't need grep or uniq:

Code:
case $( ps -o user ) in
     *USER*) echo "alcool" ;;
     *) echo "uncool" ;;
esac

However, you probably should use who or w to determine whether someone is logged in.
 

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LEARN ABOUT LINUX

zegrep

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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