You are previewing The Linux Command Line.

The Linux Command Line

Cover of The Linux Command Line by William E. Shotts Jr. Published by No Starch Press

Editing on the Fly

Our experience with text editors has been largely interactive, meaning that we manually move a cursor around and then type our changes. However, there are non-interactive ways to edit text as well. It’s possible, for example, to apply a set of changes to multiple files with a single command.

tr—Transliterate or Delete Characters

The tr program is used to transliterate characters. We can think of this as a sort of character-based search-and-replace operation. Transliteration is the process of changing characters from one alphabet to another. For example, converting characters from lowercase to uppercase is transliteration. We can perform such a conversion with tr as follows:

[me@linuxbox ˜]$ echo "lowercase letters" | tr a-z A-Z ...

The best content for your career. Discover unlimited learning on demand for around $1/day.