Mastering Command Line Efficiency: Text Shuffling with shuf and Repo Management with mr
AI-written, human-edited.
In the latest episode of the Untitled Linux Show, hosts Jonathan Bennett and Jeff Massie delved into some fascinating tools for command-line enthusiasts. Among the myriad topics discussed, two standout utilities for boosting your productivity are the shuf command for text shuffling and the mr tool for managing multiple Git repositories. Let's break down how these powerful commands can streamline your Linux workflow.
Shuffling Text Files with shuf
The shuf command is an incredibly versatile utility that allows you to shuffle lines in a text file randomly. Whether you're looking to randomize a list, create a unique sequence for testing, or just add a bit of unpredictability to your data, shuf is the tool for you.
Basic Usage:
shuf filename.txt
This command will output the lines of filename.txt in random order.
Saving the Output:
If you want to save the shuffled output to a new file, you can redirect the output like this:
shuf filename.txt > shuffled_filename.txt
Random Number Generation:
shuf can also be used to generate random numbers. For example, to generate 10 random numbers between 1 and 100:
shuf -i 1-100 -n 10
Managing Multiple Git Repositories with mr
When working with multiple Git repositories, keeping them updated and synchronized can become a daunting task. This is where the mr (myrepos) tool comes in handy. mr is designed to automate common operations across multiple repositories, making it an essential tool for developers who juggle several projects.
Basic Configuration:
First, install mr on your system. On Debian-based distributions, you can use:
sudo apt-get install mr
Next, create a configuration file .mrconfig in your home directory to list your repositories:
cat <<EOL > ~/.mrconfig
[repo1]
checkout = git clone git@github.com:user/repo1.git
[repo2]
checkout = git clone git@github.com:user/repo2.git
EOL
Common Commands:
Updating Repositories:
To update all repositories listed in your .mrconfig, simply run:
mr update
Executing Commands Across Repositories:
You can execute arbitrary commands in each repository directory. For example, to check the status of all repositories:
mr run git status
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