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diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.
diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Compute newest kernel version from Makefile on Torvalds' git repository
The platform-agnostic version of https://www.commandlinefu.com/commands/view/25276/compute-newest-kernel-version-from-makefile-on-torvalds-git-repository because macOS doesn't have wget installed

paste one file at a time instead of in parallel
paste one file at a time instead of in parallel

See where a shortened url takes you before click

count processes with status "D" uninterruptible sleep

Backup with versioning
Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by EVACopy http://evacopy.sourceforge.net

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Remove color codes (special characters) with sed

Open a file explorer on a split screen inside your vim session
Open a CLI file explorer by splitting up your screen inside your vim session. Besides, you probably are never going to forget this one.


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