Linux Terminal Command: tr

The tr command is an essential tool in File Manipulation & Viewing. In this tutorial, we will explore what tr does, look at everyday examples, and cover advanced options to supercharge your command-line workflow.

Concept & Explanation

The tr command translates, squeezes, or deletes characters from standard input, writing to standard output.

Common Options & Syntax

tr [options] [arguments]

Here are the most common flags used with tr:

Simple Usage: Basic default commands.
Detailed View: Shows diagnostic information.
Advanced Actions: Can chain parameters for scripting.

1. Interactive Example (Simple)

Here is how most people run the command:

# Example
echo 'hello' | tr 'a-z' 'A-Z'

What it does: Converts ‘hello’ to uppercase ‘HELLO’.

2. Power-User Example (Advanced)

For scripting and advanced diagnostics, use this configuration:

# Advanced
tr -cd '[:print:]' < raw_input.txt && tr -s ' ' < input.txt

What it does: Deletes all non-printable characters (-c complements target, -d deletes), and squeezes repeated spaces into a single space (-s).

⚙️ Warning & Common Pitfalls

[!WARNING] tr only reads data from standard input. It cannot take file paths as direct arguments. You must feed files using redirection (<).

Here are some related posts on cli_tty1 you might want to check out:

rm : Remove files or directories.
cp : Copy files and directories.
mv : Move or rename files and directories.