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Full Discussion: SED : Replace whole line on multiple execution
Top Forums Shell Programming and Scripting SED : Replace whole line on multiple execution Post 302519263 by bhaskar_m on Tuesday 3rd of May 2011 12:59:33 PM
Old 05-03-2011
SED : Replace whole line on multiple execution
Hi,

I am have one file with a line

Code:
group=project_live

I need to replace it with line

Code:
group=project_live_support

before I execute some application related script.

The potentianl problem is when I replace this with sed using command

Code:
sed 's/group=project_live/group=project_live_support/g' [file-name]

for the first time it works fine. But depending on my business requirement I have to run the app-script multiple times. But for second time, it replaces and produces

group=project_live_support_support

3rd time,

group=project_live_support_support_support

Very Funny!! This happens due to replacement of string again and again

I have tried to replace the full line, not able to have a break-through. Do you have any ideas how the entire line can be replaced? The only requirement is to have string will have to be replaced with "group=project_live_support" should not change with multiple run.

Thanks in advance.

Regards,
Bhaskar
 

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LEARN ABOUT SUSE

newgrp

newgrp(1)						      General Commands Manual							 newgrp(1)

NAME

       newgrp -  change effective group ID sg - execute command with different group ID

SYNOPSIS

       newgrp [-l] [group]
       sg group -c command

DESCRIPTION

       The  newgrp  command changes the user's real and effetive group ID by replacing the current shell with a new shell. A new shell is launched
       even if an error occours.

       A password is requested if the group has a password and the user is not listed in the group file as being a member of that group. The pass-
       word can be changed with the gpasswd(1) command.

       If the new effective group ID is not in the supplementary group list, newgrp will add the new group ID to the supplementary list, too.

       With  no  operands  and options, newgrp changes the user's group IDs (real and effective) back to the group specified in password and group
       file.

       The sg command works like the newgrp command, except that it executes the given command with /bin/sh and upon exit the group ID of the cur-
       rent shell is not changed.

OPTIONS

       -l, --login
	      reinitialize the environment as if the user logged in.

       --help Print a help list.

       -u, --usage
	      Print a short usage message.

       -v, --version
	      Print program version.

SEE ALSO

       gpasswd(1), group(5), passwd(1), passwd(5), su(1)

AUTHOR

       Thorsten Kukuk <kukuk@suse.de>

pwdutils							    April 2004								 newgrp(1)
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