Shell Programming and Scripting

Hello folks


Hope all are fine, I have query need suggestion, if these lines two lines are already commeted no need to do anything, one more thing order of alpha, gama may be different.


I have a two lines in a file data.txt


%checksum

alpha gama beta penta hexa

I want to do comment both lines so, files should looks like

#%checksum

# alpha gama beta penta hexa



waiting for nice suggestions.

Thanks,
Bash

Hi,
try this:
awk '{print "#"$0}' data.txt > file1.txt

in file1.txt you'll find your commented lines

Bye

Thank you for prompt reply but there are other lines also, if i use above command it will comment complete file.

try

sed -e 's/%checksum/#&/g' -e 's/alpha gama beta penta hexa/#&/g' file1.txt

Thanks, its working but its easy if you can suggest whenever i found "%checksum" comment that line and its next line, it means when found work "%checksum" comment that line and comment its next relevant line.so in that way i can easily do because as i said earlier "alpha gama order can be different".

Ok if i understand, you must match %checksum and comment it then the next line must be commented too?
You may try this:

awk '/%checksum/ {
print "#"$0;getline;
if ( match($0,"") == 1)
{print;getline}
else
getline;print "#"$0;exit }' data.txt > file1.txt

Hope it helps
bye bye

Code:

sed -e '/%checksum/s/^/#/' -e '/[agbp][lae][pmtnx][hat]/s/^/#/' test1