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Unix tool tip

@UnixToolTip

Tips on Unix utilities and related topics from @JohnDCook.

JohnDCook.com
Joined August 2011
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'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth
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Shellcheck finds bugs in shell scripts shellcheck.net/
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sdiff shows diff output side-by-side.
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A curl cheat sheet daniel.haxx.se/blog/2015/09/…
a curl cheat sheet

a curl cheat sheet

MOAR DOX! Whenever we ask curl users what they lack in our project and what we should improve, the response is always clear: documentation. Here are the most common curl command line options when...

daniel.haxx.se
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Emacs turns 50 technologyreview.com/2026/10…
Image from Unix tool tip (@UnixToolTip)
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Flatten JSON files so they're easier to grep: github.com/TomNomNom/gron
GitHub - tomnomnom/gron: Make JSON greppable!

GitHub - tomnomnom/gron: Make JSON greppable!

Make JSON greppable! Contribute to tomnomnom/gron development by creating an account on GitHub.

github.com
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Comparing regular expressions in Perl, Python, and Emacs johndcook.com/blog/regex-per…

Comparing regular expressions in Perl, Python, and Emacs

Comparing the syntax features of regular expressions in Perl, Python, and Emacs. Several other languages mostly overlap with Python.

johndcook.com
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Vim for Humans vimebook.com/en

Vim for humans

vimebook.com
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You can find the dimensions of a png image using the file command, e.g. file foo.png.
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Can install GNU versions of Unix utilities on Mac with homebrew: brew install coreutils
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The ed line editor: bravado, utility, and history johndcook.com/blog/2023/12/1…

The ed line editor: bravado, utility, and history

Is using the ed line editor a way to show technical machismo, a practical way to get work done, or a historical curiosity. It's all three.

johndcook.com
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Help for each argument of a shell command: explainshell.com/
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List only subdirectories of the current directory: ls -d */
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Avoiding multiprocessing errors in bash shell johndcook.com/blog/2024/02/1…

Multiprocess Errors | Bash Shell | Linux | Multithreading

Errors are easy to make when programming multiple concurrent processes or threads. Using atomic operations and well-formed locks can help to avoid such errors.

johndcook.com
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Shell scripts run in their own subshell, so a cd in a script only effects the subshell. To script a cd, use an alias instead.
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Two bash shortcuts to cd into /long/path/name cp file.txt /long/path/name cd !$ cp file.txt /long/path/name/foo.txt cd !$:h The :h modifier is for "head", i.e. strip off the last part of the path.
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UNIX Style, or cat -v Considered Harmful harmful.cat-v.org/cat-v/
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Summarizing Emacs cursor movement commands johndcook.com/blog/emacs_mov…

Emacs movement commands

Summary of the ways to move the point (cursor) in Emacs

johndcook.com
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Mastering the Vim language youtube.com/watch?v=wlR5gYd6… by @christoomey
Mastering the Vim Language

Mastering the Vim Language

Chris Toomey talks about mastering the Vim language. Vim's core is ...

youtube.com
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Better bash scripting in 15 minutes robertmuth.blogspot.com/2012…
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bash lets you use &> to send stdout and stderr to a file. Version 4 or later.
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