Whenever i am using my sed command in ubuntu the output is not reflected in the file.
sed 's/dog/cat/' me
does not change dog hates rat in the file to cat hates rat in the file me.
Asked
Active
Viewed 2,435 times
1 Answers
3
By default, sed does not edit the input file, it just shows the output on STDOUT.
To edit a file in place, you need the -i option of sed:
sed -i.bak 's/dog/cat/' file.txt
After the operation, the original file will be backup up as file.txt.bak and the modified file will be file.txt.
In your case:
sed -i.bak 's/dog/cat/' me
If you do not want to keep a back up:
sed -i 's/dog/cat/' file.txt
From man sed:
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if SUFFIX supplied)
