how to add # in a file

gsr_kashyap · 04-10-2006, 02:51 AM

hi everyone,
can any one tell me how to add # in a file.if i run the script it should check whether there is # in that line if it isn't then add else skip that line.
thanks in advance
kash

acid_kewpie · 04-10-2006, 02:53 AM

how to add a hash sign?? erm... just press that key when you are editing it..

gsr_kashyap · 04-10-2006, 03:38 AM

that's great idea but i want a better one. when i execute the script the script should open the file and add hash(#).

acid_kewpie · 04-10-2006, 03:41 AM

well it helps if you actually explain what you want to do properly...

you can easily add a character to the end of a file, e.g. "echo # >> filename" if that's all you are after.

AnanthaP · 04-10-2006, 03:42 AM

The generic algorithm would be:

foreach line read:
If col1 not eq #, then
Write a #
end If
Write the line.
Move onto the next line.

Its possible with `awk` in any *nix or perl.
End

gsr_kashyap · 04-10-2006, 03:50 AM

not exactly at the end of the file but starting of everyline.

AnanthaP · 04-10-2006, 03:52 AM

Kash.
You must have seen that the loop was <for each line read> ... <move on to the the next line>.

Whose your teacher?

end

gsr_kashyap · 04-10-2006, 04:37 AM

i know the algorithm as i am not good at programing thats why i amd asking for the script.
btw who ever is my teacher doesnt mind here!!

gsr_kashyap · 04-11-2006, 08:06 AM

ok everyone i at last i got the solution and want to share it .hope one understands wht i ment

#!/usr/bin/bash

/usr/bin/awk '{
if ($0 in stored_lines)
x=1
else
print "#" $0
stored_lines[$0]=1
}' <full path filename>