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add the result of a command into vi
':r!ls -l' results in listing the files in the current directory and paste it into vi

List all symbolic links in current directory
For those who don't have the symlinks command, you can use readlink. This command is not straightforward because readlink is very picky. The backslash in front of 'ls' means not to use an alias (e.g. color escape codes from an aliased 'ls' could mess up readlink), and the -1 (one) means to print the entries separated by newlines. xargs -l (the letter L) means to process each input separated by newlines as separate commands.

Find the process you are looking for minus the grepped one
faster ;) but your idea is really cool

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Compare two directory trees.
This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

list processes with established tcp connections (without netstat)
Uses lsof to list open network connections (file descriptors), grepping for only those in an established state

Length of longest line of code
Here's an awk version.

Remove last line from files recursively
Used this command recently to remove the trailing ?> from all the files in a php project, which has having some unnecessary whitespace issues. Obviously, change *.php to whatever you'd like.

Calculates the date 2 weeks ago from Saturday the specified format.
Good for automating reports that need to run from between two dates.

Join lines
It's works only when you replace '\n' to ONE character.


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