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Symlink all files from a base directory to a target directory
Symlinks all files in the base directory to the target directory then lists all of the created symlinks.

Short one line while loop that outputs parameterized content from one file to another
There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?

Enable automatic typo correction for directory names

A function to find the newest file in a directory

Go to the next sibling directory in alphabetical order, version 2
Another version based on linkinpark342's contribution. Sometimes you have to browse your way through a lot of sub-directories. This command cd to the next sub-directory in alphabetical order. For example, if you have the directories "lectures/01-intro", "lectures/02-basic", "lectures/03-advanced" and so on, and your PWD is "02-basic", it jumps to "03-advanced".

Display disk partition sizes
It is the same but more faster real 0m0,007s user 0m0,011s sys 0m0,000s with my solution real 0m0,038s user 0m0,044s sys 0m0,000s with your solution :)

Add your public SSH key to a server in one command
Just run the command, type your password, and that's the last time you need to enter your password for that server. This assumes that the server supports publickey authentication. Also, the permissions on your home dir are 755, and the permissions on your .ssh dir are 700 (local and remote).

Rapidly invoke an editor to write a long, complex, or tricky command
Allows you to edit your command using your chosen editor. Works in bash with "set -o vi".

show the date every rpm was installed
the newest rpms are at the top; individual packages can also be queried this way: rpm --last -q package

grep -v with multiple patterns.
If you wanted to do all in one command, you could go w/ sed instead


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