Shell Programming and Scripting

That's not very clear what you want, anyway ...

Code:

awk '!/^tito|^reta|^$/{print}END{print "pppp.abcd.com"}' file > new_file

thanks, its typo , i want it without redirection.

like i enter command and it change in a file directly no need for redirection.

kindly advice.

Thanks,
Bash

Some commands have an option to use a temporary file behind your back, and replace the original file with the temporary file if the command is successful, but awk is not among those commands. Your sed might or might not have an -i option; Perl also has it (all modern versions and ancient ones too, as far back as I remember).

Code:

perl -i~ -ne 'print unless /^(tito|reta)-k\.abcd\.com$/; END { print "pppp.abcd.com\n" }' file

The ~ argument to -i says to save the original file in file~ with a tilde appended, just so you can rescue it if things go wrong. If you don't want a backup, just remove the tilde from the command line.

[QUOTE=era;302230635]Some commands have an option to use a temporary file behind your back, and replace the original file with the temporary file if the command is successful, but awk is not among those commands. Your sed might or might not have an -i option; Perl also has it (all modern versions and ancient ones too, as far back as I remember).

Code:

perl -i~ -ne 'print unless /^(tito|reta)-k\.abcd\.com$/; END { print "pppp.abcd.com\n" }' file

This command is removing perfectly but not adding that line which is required. after i run command a blank line add up.

Kindly advice.

Thanks,
Bash

Using GNU sed:

Code:

sed -i '/^tito\|^reta\|^$/d;$a pppp.abcd.com' file

Code:

sed -i '/^tito\|^reta\|^$/d;$a pppp.abcd.com' file

[/QUOTE]

one thing it will not add if pppp.abcd.com already exist.

Thanks,
Bash

Please clear your requirements: Should or should not add the line ppp.abcd.com if record exists in file?