How do I insert a line/value after a particular line, in file with sed

Glenn D. · 01-13-2010, 12:37 AM

Hello
I need to run a command in a shell script to insert a line in a file, after it finds certain line.

To add the line 'user = mysql'
after the line [mysqld]
in file /etc/my.cnf

How can that be done ?
I am thinking of using sed to accomplish it.

An example is appreciated.
Cheers Glenn

Ni2 · 01-13-2010, 02:47 AM

try

awk '{if (/\[mysqld\]/) {print $0 "\nuser = mysql"} else {print $0} }' /etc/my.cnf > my.cnf.modified

grail · 01-20-2010, 01:29 AM

or with sed it would be:

sed -i -e '/[mysqld]/auser = mysql' /etc/my.cnf

BenCollver · 01-21-2010, 09:14 PM

sed -e 's/\[mysqld\]/&^Muser = mysql/'

Where ^M is Control-V Control-M in vim on 'nix.