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Shell Programming and Scripting

Append text on particular line after pattern found

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# 1  
Old 09-03-2013
Append text on particular line after pattern found
hi,

i have /etc/inittab, I want to add another line after that when i find a pattern "l6:6:wait:/etc/rc.d/rc 6".

Code:
original
l6:6:wait:/etc/rc.d/rc 6

Code:
after-change
l6:6:wait:/etc/rc.d/rc 6
/sbin/if-pp-to-cng

# 2  
Old 09-03-2013
Code:
sed -i.bak '/l6:6:wait:\/etc\/rc.d\/rc 6/ a \/sbin\/if-pp-to-cng' /etc/inittab

# 3  
Old 09-03-2013
Code:
awk -v new="/sbin/if-pp-to-cng" '($0=="l6:6:wait:/etc/rc.d/rc 6") {$0=$0"\n"new} 1' /etc/inittab

# 4  
Old 09-03-2013
Why use a variable, add it directly
Code:
awk '($0=="l6:6:wait:/etc/rc.d/rc 6") {$0=$0"\n/sbin/if-pp-to-cng"} 1' /etc/inittab

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