How can I delete lines that have some special character with command line?

Question

Hi I have a long file like this:

information_1 this is my file....@s...asdadada 
information_2 this is my file....s...asdadada sdsfsd
information_3 this is my file@sasdadada 
information_4 this is my filesasdadada 
information_5 this is my filesasdadada@

And I want a file like this, whitout the lines that contains "@" charachter:

information_2 this is my file....s...asdadada sdsfsd
information_4 this is my filesasdadada 

How can I do it with bash commands like sed, awk...?

Answer 1

With sed :

 sed '/@/d' file

Deletes all lines that contain a @.

With grep :

grep -v @ file

Output lines that does not contain a @.

Answer 2

With awk:

$ awk '!/@/' file
information_2 this is my file....s...asdadada sdsfsd
information_4 this is my filesasdadada

Answer 3

With perl:

$ perl -ne 'print unless /@/' file

To replace in file (also create a backup .BAK for example, more precisely rename file to file.BAK and create new file with the same name)

$ perl -i.BAK -ne 'print unless /@/' file