Over the years, the primary way that I’ve used sed is to change text on the fly. There are many occassions in which I want to change one string to another the first or every time that it appears in a ...

The “l” at the beginning identifies /usr/bin/awk as a symbolic link. NOTE: Without the commas, the result would be “onetwothree”. Note that gawk allows you to ...

I love chaining commands as much as anyone, and sed, awk, grep, and perl are some of my best friends. However, remember that, in *nix, each command runs in its own process, the resources required for ...

The person that has to figure out why your scripts are broken will thank you. It's good to know the syntax of sed/awk for those (hopefully rare) cases where you don't have a more evolved scripting ...