Awk/sed to add text

[jls]

Hi everyone

I need to use sed or awk to append text to lines in which a pattern has been matched.

In other words, add the character '5' to every line containg the string 'BLAH'

I find the man pages very cryptic and don't have time at the moment to lear these applications. PLease help.

Thanks

[ghostdog74]

example input:

aaaaa
sadafsa
blah asljfsldf
asfdsad
asfdsfad
asfdfsafd
blah xxxxx
asdfsafdsa
asfdasdfa
sadfasdsaf

output:

# awk '/blah/{ $0=$0"5" } {print} ' file
aaaaa
sadafsa
blah asljfsldf5
asfdsad
asfdsfad
asfdfsafd
blah xxxxx5
asdfsafdsa
asfdasdfa
sadfasdsaf

[Sangal-Arun]

Let's take an example: Suppose a1.txt contains the lines..see cat command output on a1.txt file.

$ cat a1.txt
BLAH arun
arun arun
arun BLAH
Jhola Linux BLAH Hurray!
Quiting after entring the line below
Bye ByeBLAH!!!


# this will give change BLAH to BLAH5

$ sed -n '/BLAH/s/BLAH/&5/ p' a1.txt
BLAH5 arun
arun BLAH5
Jhola Linux BLAH5 Hurray!
Bye ByeBLAH5!!!

#Same as above, but useful if a line contains multiple BLAH keyword

$ sed -n '/BLAH/s/BLAH/&5/gp' a1.txt
BLAH5 arun
arun BLAH5
Jhola Linux BLAH5 Hurray!
Bye BLAH5 ByeBLAH5!!!


# This will append your desired text lets say "5" at the last of the line which # contains BLAH keyword

$ sed -n '/BLAH/s/$/5/ p' a1.txt
BLAH arun5
arun BLAH5
Jhola Linux BLAH Hurray!5
Bye ByeBLAH!!!5

I hope this will help...or let us know.

Cheers!
/Arun Sangal

[jls]

Thanks guys for the quick response and the help. Sed is now my friend!