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Full Discussion: The "read" command
Top Forums UNIX for Advanced & Expert Users The "read" command Post 43303 by 435 Gavea on Friday 14th of November 2003 03:39:44 PM
Old 11-14-2003
Question And now what ...

Here I go again...

So, the script is working pretty well now, but I'm testing a case that...
In my opinion should not work, but the program "understands" it anyway and fortunately acts correctly !

Here it is:
When I search for a pattern like "proc.sh" in lines like
"more proc.sh"
"grep proc.sh"
"/bin/ksh ./proc.sh" ---> using grep, it returns all this lines, and that's ok, 'cause in fact they all have this "proc.sh" pattern.

But searching for a pattern like "./proc.sh"
in "/bin/ksh proc.sh", for example, the grep still returns this line as result ! Why this happens ? I'm not passing any parameter, so
wasn't grep supposed to find for an occurance of the ENTIRE pattern ./proc.sh ? I thaught it was ... Smilie
Well, here's the current code for the script:
Code:
#!/bin/ksh

CUR_SHELL="/bin/ksh"
V1="VAR1"
set -x

ps -e -o args | grep "$1" | tr -s " " | cut -d" " -f1 |
while read -r V1
do
    #V1=`echo $V1 | cut -d'/' -f2`
    if [ "$V1" = "$CUR_SHELL" ]; then
    echo "Error - Program is already running."
    exit 1
    fi 
done

If anyone could help...
Thanks in advance,

435 Gavea.

added code tags for readability --oombera

Last edited by oombera; 02-21-2004 at 02:19 AM..
 

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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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