CODEWITHSUNDEEP
shell
SeaJelly
SeaJelly

Reputation: 1746

Shell command to iterate through every line of a text file

I'm trying to run ack in my current directory with the keyword to be each line of a text file, and I tried the following command on the command line:

cat ~/temp/imageFileNames.txt | while read line; do ack "$line"; done

However, no output was produced at all, even though each line individually produces output if I run ack on it manually. What's the problem with this command?

Upvotes: 0

Views: 324

Answers (1)

SlightlyCuban
SlightlyCuban

Reputation: 3255

ack works on whole files, line-by-line. For this, just do:

ack "$line" ~/temp/imageFileNames.txt

And it should print out all lines that contain whatever you put for "$line". Check the docs for a better usage description than I can give: http://linux.die.net/man/1/ack

Upvotes: 1

Related Questions