Commands by j4ps (1)

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Switch 2 characters on a command line.
If you typed 'sl', put the cursor on the 'l' and hit ctrl-t to get 'ls'.

Create date based backups
This script creates date based backups of the files. It copies the files to the same place the original ones are but with an additional extension that is the timestamp of the copy on the following format: YearMonthDay-HourMinuteSecond

Find the most recent snapshot for an AWS EBS volume
Uses the python-based AWS CLI (https://aws.amazon.com/cli/) and the JSON query tool, JQ (https://stedolan.github.io/jq/)

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

Generate an XKCD #936 style 4 word passphrase (fast)
This restricts things 3 ways: 1. No capitalized words, hence no proper names. 2. No apostrophes. 3. Restricts size to range (3,7)

Runs previous command replacing foo by bar every time that foo appears
Very useful for rerunning a long command changing some arguments globally. As opposed to ^foo^bar, which only replaces the first occurrence of foo, this one changes every occurrence.

clear MyDNS-ng cache
Occasionally, to force zone updating, cache flush is necessary. This command is better than restart the mydns daemon.

Show git branches by date - useful for showing active branches
This fixes a bug found in the other scripts which fail when a branch has the same name as a file or directory in the current directory.

SAR - List the average memory usage for all days recorded under '/var/log/sa/*' using sar -r.

find all executable files across the entire tree
I can think of using this command after compiling an downloaded source from anywhere as an easy way to find all executable products. We usually issue the $ find command (without arguments) to list the full paths of all directories and sub-directories and files in the entire current tree. Similar command is $ tree -aicfnF


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