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Search and Replace a text if the line contains a pattern

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# 1  
Old 08-23-2013
Search and Replace a text if the line contains a pattern
My text file looks like below

Code:
.
.
.
abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.txt
$Bad_abcd_REJ=rcrd_op.txt

ghijklm
$Bad_abcd_TYHS=rcrd_op.txt
abcgd

abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.txt
$Bad_abcd_JER=rcrd_op.txt

qrstuv
$Bad_abcd_TYHS=rcrd_op.txt
wxyz
.
.
.

I have replace .txt with .log only if the line contains $Bad*GTS or $Bad*JER

Output:
Code:
.
.
.
abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.log
$Bad_abcd_REJ=rcrd_op.log

ghijklm
qrstuv
$Bad_abcd_TYHS=rcrd_op.txt
abcgd

abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.log
$Bad_abcd_JER=rcrd_op.log

qrstuv
qrstuv
$Bad_abcd_TYHS=rcrd_op.txt
wxyz
.
.
.

Smilie
# 2  
Old 08-23-2013
Code:
awk '/\$Bad/&&(/GTS/||/JER/||/REJ/)&&/txt/ {gsub(/.txt/, ".log")} 1' infile

This User Gave Thanks to krishmaths For This Post:
machomaddy
# 3  
Old 08-23-2013
Quote:
$Bad_abcd_REJ=rcrd_op.txt
Is this a typo?
Shorten the solution krishmaths posted.
(no need to test for txt, since txt is what we replace)

Code:
awk '/\$Bad.*(GTS|JER)/ {gsub(/.txt/, ".log")} 1' file
abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.log
$Bad_abcd_JER=rcrd_op.log

ghijklm
$Bad_abcd_TYHS=rcrd_op.txt
abcgd

abcdefghi
jklmnop

$Bad_ptrq_GTS=rcrd_ip.log
$Bad_abcd_JER=rcrd_op.log

qrstuv
$Bad_abcd_TYHS=rcrd_op.txt
wxyz

This User Gave Thanks to Jotne For This Post:
machomaddy
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