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Full Discussion: grep a pattern and replace a value in it and write to the same file.
Top Forums Shell Programming and Scripting grep a pattern and replace a value in it and write to the same file. Post 302352325 by yesmani on Friday 11th of September 2009 04:07:00 AM
Old 09-11-2009
grep a pattern and replace a value in it and write to the same file.
I have some complication with this, I have a file like below[db.sh] for DEV_1 till DEV_10. and the db values are set accordinly which are not unique. For example DEV1,DEV4,DEV6 can have the same target DB name.
I waned to identify[grep] for DEV_2 and then replace the TARGET_DATABASE value with the new DB name, can you suggest.

DEV_1_SOURCE_DATABASE=server1
DEV_1_SOURCE_AUDIT_DATABASE= server1
DEV_1_TARGET_DATABASE=server4
DEV_1_TARGET_AUDIT_DATABASE=server4

DEV_2_SOURCE_DATABASE=server2
DEV_2_SOURCE_AUDIT_DATABASE= server2
DEV_2_TARGET_DATABASE=server5
DEV_2_TARGET_AUDIT_DATABASE=server5
.
.
.
.
.
.


i used sed like sed 's/`cat db.sh | grep -i DEV_2 | grep -i database | egrep -v "audit|source"`/newdbname' < db.sh > db.sh_new
i got a error;
tried awk but dint work as i am trying to pass command on:
can someone help in this :
my ultimate need is i need to grep a pattern and replace the value in that location only,


this might be too long !!!!
 

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LEARN ABOUT SUSE

bzgrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All 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  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)
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