Check These Out
This one-liner will the *delete* without any further confirmation all 100% duplicates but one based on their md5 hash in the current directory tree (i.e including files in its subdirectories).
Good for cleaning up collections of mp3 files or pictures of your dog|cat|kids|wife being present in gazillion incarnations on hd.
md5sum can be substituted with sha1sum without problems.
The actual filename is not taken into account-just the hash is used.
Whatever sort thinks is the first filename is kept.
It is assumed that the filename does not contain 0x00.
As per the good suggestion in the first comment, this one does a hard link instead:
$ find . -xdev -type f -print0 | xargs -0 md5sum | sort | perl -ne 'chomp; $ph=$h; ($h,$f)=split(/\s+/,$_,2); if ($h ne $ph) { $k = $f; } else { unlink($f); link($k, $f); }'
Useful tool to test if all speaker channels are working properly. speaker-test is part of alsa-utils package
Show external IP and geolocation information.
Primary feature is the use of tee to echo IP _and_ send to geoiplookup command...Use IP as input for as many commands as you want with more >( [command] )
Thanks to http://www.commandlinefu.com/commands/view/6334/
Requires MaxMind DB and geoiplookup tool.
Sample output has IP obfuscated on first line, lines 2-4 from having MaxMind Country && MaxMind City DBs installed
extracts the 5th column using the delimiter ','
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token.
This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use:
`awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'`
You must adapt the command line to include:
* $MFA_IDis ARN of the virtual MFA or serial number of the physical one
* TTL for the credentials
I just found another use for the builtin ':' bash command. It increments counters for me in a loop if a certain condition is met...
: [arguments]
No effect; the command does nothing beyond expanding arguments and performing any specified redirections. A zero exit code is returned.
This is an alternative to another command using two xargs. If it's a command you know there's only one of, you can just use:
$ ls -l /proc/$(pgrep COMMAND)/cwd
Same as the other rtfm's, but using the more correct xdg-open instead of $BROWSER.
I can't find a way to open info only if the term exists, so it stays out of my version.
Using this command you can track a moment when usb device was attached.
