Commands by argherna

Commands by argherna (3)

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Encode/Decode text to/from Base64 on a Mac w/out Mac Ports

I have a mac, and do not want to install mac ports to get the base64 binary. Using openssl will do the trick just fine. Note, to decode base64, specify a '-d' after 'base64' in the command. Note also the files base64.decoded.txt and base64.encoded.txt are text files.
This is sample output - yours may be different.
3

openssl base64 -in base64.decoded.txt -out base64.encoded.txt

argherna · 2010-08-13 20:39:10 0
Remove an unnecessary suffix from a file name for all files in a directory

For this example, all files in the current directory that end in '.xml.skippy' will have the '.skippy' removed from their names.
This is sample output - yours may be different.
-2

for f in $(ls *.xml.skippy); do mv $f `echo $f | sed 's|.skippy||'`; done

argherna · 2009-11-19 21:36:26 11
Pipe ls output into less

This is useful for paging through long directories, mulitple directories, etc. I put this in my ~/.bash_aliases file and alias 'lsl' to it.
This is sample output - yours may be different.
-2

function lsless() { ls "$@" | less; }

argherna · 2009-11-13 17:28:06 4

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Like top but for files

Like top, but for files

Timer with sound alarm

I'd prefer this one, you have to install espeak to get this running

Touch a file using a timestamp embedded in the file name.

tstouch takes two arguments: a filename containing a timestamp, and an extended regular expression with the parenthesized section matching a timestamp of the form YYYYMMDDhhmm or YYYYMMDDhhmm.ss. It then touches the file with that timestamp.

Get OSX Battery percentage

adjusting the field "f1" will give you additional information such as f1 = 98% f2 = discharging f3 = 2:02 remaining

Find usb device in realtime

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

Download all Red Hat Manuals - A better way by user Flatcap

Let's give Flatcap credit for this elegant solution, instead of leaving it hidden as a comment. Tested on RHEL6 and it works. Nice and clean.

Multi-thread any command

For instance: $ find . -type f -name '*.wav' -print0 |xargs -0 -P 3 -n 1 flac -V8 will encode all .wav files into FLAC in parallel. Explanation of xargs flags: -P [max-procs]: Max number of invocations to run at once. Set to 0 to run all at once [potentially dangerous re: excessive RAM usage]. -n [max-args]: Max number of arguments from the list to send to each invocation. -0: Stdin is a null-terminated list. I use xargs to build parallel-processing frameworks into my scripts like the one here: http://pastebin.com/1GvcifYa

A signal trap that logs when your script was killed and what other processes were running at that time

trap is the bash builtin that allows you to execute commands when the current script receives a particular signal. Uses $0 for the script name, $$ for the script PID, tee to output to STDOUT as well as a log file and ps to log other running processes.

Start a terminal with three open tabs

If you launch gnome-terminal manually, you can start with three open tabs

Extract neatly a rar compressed file

It's also possible to delay the extraction (echo "unrar e ... fi" |at now+20 minutes) wich is really convenient!

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