Trying to search for a string and append text only once Post: 302534317

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Top Forums Shell Programming and Scripting Trying to search for a string and append text only once Post 302534317 by bludhemn on Monday 27th of June 2011 12:59:48 PM

06-27-2011

Registered User

Trying to search for a string and append text only once

Hi

I am trying to search for a particular occurrence of a string in a file, and if found, append another string to the end of that line.

Here is my file contents:

column1 userlist default nowrite=3 output=4
column2 access default nowrite=3

Here is the code:

Code:

A="user=1 user=2"
B="mindays"
C="minmonth"
D="minyear"

if ! grep -qw "$A" testfile
then
awk '( $1 == "column1" && $2 == "userlist" && $3 == "default" ) { print $0 " user=1 user=2 "; next }; { print }' testfile > newtestfile
else
echo $A does exist
fi

if ! grep -qw "$B" testfile
then
awk '( $1 == "column2" && $2 == "access" && $3 == "default" ) { print $0 " mindays=5 "; next }; { print }' testfile > newtestfile
else
echo $B does exist
fi

So what I'm trying to do is assign variables to the strings i need to search for, grep the file to see if those strings exists, and if it doesnt, append some text to end of only that line.

It now overwrites the output file each time awk is run. I need the changes to stay after each awk modification.

Can someone please assist?

Thanks

bludhemn

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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)