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Go (cd) directly into a new temp folder
This command create a new temp directory using mktemp (to avoid collisions) and change the current working directory to the created directory.

Prefix every line with a timestamp
Useful to add a timestamp to every line printed to stdout. You can use `-Ins` instead of `-Iseconds` if you want more precision.

recursive search and replace old with new string, inside files
recursively traverse the directory structure from . down, look for string "oldstring" in all files, and replace it with "newstring", wherever found also: $ grep -rl oldstring . |xargs perl -pi~ -e 's/oldstring/newstring'

Show errors in the kernel ring buffer
Much more useful then parsing syslog

Show directories in the PATH, one per line
quoteless

Execute a command without saving it in the history
Yes, by correctly setting the HIST* variables you can make certain commands not saved in history. But that's complicated and easy to make a mistake. If you set HISTFILE= to blank, nothing in your current shell session will be saved in history. Although this is not a precise answer to the subject, but it's very simple.

Purge configuration files of removed packages on debian based systems
Purge all configuration files of removed packages

List only locally modified files with CVS

Stop and continue processing on a terminal
This will send the ASCII sequence for DC3 to the currently running tty which results in SIGSTOP (19). You can continue with ASCII sequence for DC1 by pressing CTRL+q which results in SIGCONT (18).

Most used commands from history (without perl)
I copied this (let's be honest) somewhere on internet and I just made it as a function ready to be used as alias. It shows the 10 most used commands from history. This seems to be just another "most used commands from history", but hey.. this is a function!!! :D


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