How to replace specific text line out of multiple occurance

madhusmita · #1 (**permalink**) 06-17-2008

Hi

I would like to replace specific line eg ExitAction = NONE to ExitAction = FALSE under only TASK sipsiproc and other ExitAction = NONE will remain as usual in the file(shell script)

The file contains:

Code:

TASK rgcdproc {
    CommandLine    = $SSHOME/bin/rgcd.exe
    NewConsole     = yes
    ExitAction     = NONE
    DependantProcs = megacopiproc
}

TASK sipsubsystemproc {
    CommandLine    = $SSHOME/bin/sipsubsystem.exe
    NewConsole     = yes
    ExitAction     = NONE
    DependantProcs = sipsiproc
}

TASK sipsiproc {
    CommandLine    = $SSHOME/bin/sip_si.exe
    NewConsole     = yes
    ExitAction     = NONE
    DependantProcs = sipsubsystemproc
}

TASK megacopiproc {
    CommandLine    = $SSHOME/bin/megacopi.exe
    NewConsole     = yes
    ExitAction     = NONE
    DependantProcs = rgcdproc

With regards,
Madhu

radoulov · #2 (**permalink**) 06-17-2008

Code:

perl -i.bak -00 -pe's/(TASK sipsiproc.*?ExitAction = )NONE/$1FALSE/s' inputfile

or:

Code:

perl -i.bak -00 -pe's/ExitAction = NONE/ExitAction = FALSE/ if /^TASK sipsiproc/' inputfile

With Awk (nawk or /usr/xpg4/bin/awk on Solaris):

Code:

awk '/^TASK sipsiproc/{sub(/ExitAction = NONE/,"ExitAction = FLASE")}1' ORS="\n\n" RS= inputfile>newfile

madhusmita · #3 (**permalink**) 06-17-2008

Thanks a lot

kahuna · #4 (**permalink**) 06-17-2008

Radoulov,

Quote:

Originally Posted by radoulov

Code:

perl -i.bak -00 -pe's/ExitAction = NONE/ExitAction = FALSE/ if /^TASK sipsiproc/' inputfile

Could you explain a little more on how the second perl solution works? I can't figure out how the substitute knows which "ExitAction = NONE" to substitute. I see that you're qualifying it with the if statement, but I still don't see how that makes the substitute get right "ExitAction = NONE" and not the first "ExitAction = NONE" .

radoulov · #5 (**permalink**) 06-17-2008

Quote:

Originally Posted by kahuna

Radoulov,

Could you explain a little more on how the second perl solution works? I can't figure out how the substitute knows which "ExitAction = NONE" to substitute. I see that you're qualifying it with the if statement, but I still don't see how that makes the substitute get right "ExitAction = NONE" and not the first "ExitAction = NONE" .

Sure,
the -00 flag+argument turns the paragraph mode on.
From perldoc perlrun:

Quote:

Switches include:

-0[octal/hexadecimal]
specifies the input record separator ($/) as an octal or hexadeci-
mal number. If there are no digits, the null character is the
separator.
[...]

The special value 00 will cause Perl to slurp files in paragraph
mode. The value 0777 will cause Perl to slurp files whole because
there is no legal byte with that value.

In this mode each record is a paragraph of text terminated by one or more empty lines.
So change the ExitAction only for the record(s)/paragraph(s) that begin with the pattern "Task sipsiproc".

kahuna · #6 (**permalink**) 06-17-2008

Thanks radoulov! I learned something today.

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