Post your Command line tricks

[Alad]

^ Just in time *splat*

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alias rotmuggen='play -n synth sine 20k'

Thanks :)

[rhowaldt]

^ rotmuggen :D

[pidsley]

Maybe old knowledge, but I just learned that vim can browse tar archives.

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$ vim <file.tar.gz>

You can even drill down to individual files and open them.

[wuxmedia]

^ That's really handy, I didn't know that.
be useful to help extract them in conjunction with the !command i guess.

[GekkoP]

^^ very useful!

[machinebacon]

Trollbacon has to mention the Tarmode of Emacs, in this case: http://www.emacswiki.org/emacs/TarMode

Can basically do the same, like in dired.

[Alad]

Dynamic titles for urxvt/xterm like in tmux; add to ~/.bashrc

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# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
	PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD}\007"'

	# Show the currently running command in the terminal title:
	# http://www.davidpashley.com/articles/xterm-titles-with-bash.html
	show_command_in_title_bar() {
	case "$BASH_COMMAND" in
	*\033]0*)
		# The command is trying to set the title bar as well;
		# this is most likely the execution of $PROMPT_COMMAND.
		# In any case nested escapes confuse the terminal, so don't
		# output them.
		;;
	*)
		echo -ne "\e]0;"
		echo -n "$BASH_COMMAND"
		echo -ne "\007"
		;;
	esac
    	}

	trap show_command_in_title_bar DEBUG
	;;
*)
	;;
esac

http://mg.pov.lt/blog/bash-prompt.html

[machinebacon]

^ great, thanks Alad!

[Alad]

Small tip if you have a delay when switching between X and TTYs, and use a newer Intel GPU:

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/etc/X11/xorg.conf.d/20-intel.conf
----
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "AccelMethod"  "glamor"
EndSection

(source)

[z3bra]

Need a to test a quick C snippet ?

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~ $ alias cquick="echo '#include \"/dev/stdin\"'; cc a.c; ./a.out"
~ $ cquick
#include <stdio.h>
int
main ( void )
    {
    printf ( "Hello, world!\n" );
    return 0;
    }
Hello, world!

Upon compilation, you'll be able to type your program to stdin. Once you're done, press ^D and the program you just typed will compile to "a.out" and start it.

[z3bra]

Another fine trick is the use of the "base64" tool to upload any file to a pastebin, like this:

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base64 random_file.tar.gz | curl -sF 'sprunge=<-' http://sprunge.us

This command will upload your base64'd file as plain text, and give you the URL to access it. You will then be able to download it as such:

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curl -s http://sprunge.us/XXXX | base64 -d > download_file.tar.gz

Or even quicker (in this case)

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curl -s http://sprunge.us/XXX | base64 -d | gunzip - | tar cvf -

[johnraff]

(Hi again )
Shuffle an array.
I googled this but all the solutions seemed overcomplicated. If you have 'shuf' available, then the simplest way seemed to be to shuffle the indices of the array, not the elements. The indices are just simple integers, so the array elements can contain anything - spaces, line breaks, whatever. You could shuffle paragraphs of text for example (Rhowaldt?)

Only limitation - you can't shuffle the array in place, you have to make a new shuffled one - rename it later if you want.
A is the original array, B is the shuffled one:

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for i in $(shuf -e ${!A[@]});do B+=("${A[$i]}");done

Thanks to Pidsley for pointing out the -e option for shuf in his random mp3 stick filler.

If you just want to spit out the shuffled elements:

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for i in $(shuf -e ${!A[@]});do echo "${A[$i]}";done

or whatever.

[wuxmedia]

Thanks for the input guys, as you know, take me away from the browsers built in spelling thing, and i'm a bit lost.
having trouble:

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aspell -a

puts it in interactive mode, so i can type my spazzy word; nessaccery - for example - and it pops out with all the variations it can thing of:

wux@chauvin:~$ aspell -a
@(#) International Ispell Version 3.1.20 (but really Aspell 0.60.7-20110707)

nessacary
& nessacary 12 0: NASCAR, necessary, scary, descry, massacre, Nescafe, sacra, NASCAR's, mascara, scare, cascara, sugary

I think you can pipe the word in, but you'd need echo or something, then write a bash function, yadahyada...

[machinebacon]

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function gal() { find . -iname "*.jpg" -o -iname "*.png" -printf '<img src="%f" title="%f">\n' > gallery.html ;}

creates a html gallery of all png/jpg image files in the directory it is run.

[wuxmedia]

Runaway find process hogging your i/o?

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ionice -c3 -p `pidof find`

[Alad]

Find out an IP or hostname's location:

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ipif() { 
	if grep -P "(([1-9]\d{0,2})\.){3}(?2)" <<< "$1"
	then
		curl ipinfo.io/"$1"
	else
		ipadd=$(host "$1") &&
		ipawk=$(awk '{ print $4 }' <<< "$ipadd")
		curl ipinfo.io/"$ipawk"
	fi
	echo
}

PS: I suck at regex

edit: got some help from wei2912 - note that neither pattern works with bash =~, so I went with grep -P. If you want details, ask him. :P

edit9000: ugh

[rhowaldt]

^ hahaha, you really suck at rege... oh wait you said that already.
okay i agree there is probably a shorter solution for that regex line, but i really cant be arsed to figure it out. if it works, it works :)

[wuxmedia]

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Ragex

[machinebacon]

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geoip(){ curl freegeoip.net/xml/$1; }

take it easy ;) limited to 10'000 queries per hour

[wuxmedia]

or the slightly more convoluted:

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<install> geoip-database 

then:

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geoiplookup <ip>

yeah -linux! Ten million ways to find out an IP