Commands by karpoke

Commands by karpoke (7)

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See where a shortened url takes you before click

We can put this inside a function: fxray() { curl -s http://urlxray.com/display.php?url="$1" | grep -o '<title>.*</title>' | sed 's/<title>.*--> $.*$<\/title>/\1/g'; }; fxray http://tinyurl.com/demo-xray Show Sample Output
This is sample output - yours may be different.
```
http://urlxray.com/sex-so-hot-it-will-blow-your-mind.php

(Note: this result is totally SFW)
```
-3

curl -s http://urlxray.com/display.php?url=http://tinyurl.com/demo-xray | grep -o '<title>.*</title>' | sed 's/<title>.*--> $.*$<\/title>/\1/g'

karpoke · 2010-09-30 10:25:18 4
list all file extensions in a directory

If we want files with more than one extension, like .tar.gz, only appear the latest, .gz: ls -Xp /path/to/dir | grep -Eo "\.[^./]+$" | uniq Show Sample Output
This is sample output - yours may be different.
```
.tar.gz
.py
.pyc
```
0

ls -Xp /path/to/dir | grep -Eo "\.[^/]+$" | uniq

karpoke · 2010-08-12 16:32:54 6
Converts uppercase chars in a string to lowercase

Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG Show Sample Output
This is sample output - yours may be different.
```
string
```
3

s="StrinG"; echo ${s,,}

karpoke · 2010-08-12 16:02:38 8
Reducing image size

Adding the exclamation mark to the image geometry ignores the original aspect ratio. More info about image geometry: http://www.imagemagick.org/script/command-line-processing.php#geometry
This is sample output - yours may be different.
1

convert example.png -resize 100x100! output.png

karpoke · 2010-08-08 17:29:36 3

print statistics about users' connect time

'ac' is included in the package 'acct', which is described as "The GNU Accounting utilities for process and login accounting". Other interesting flags are: * print statistics for a specified user ac -d username * print statistics for all the users ac -p With my command, the output is also printed in a sexagesimal, more readable, style. Show Sample Output

-1

ac -d | awk '{h=int($NF); m=($NF-h)*60; s=int((m-int(m))*60); m=int(m); print $0" = "h"h "m"m "s"s "}'

karpoke · 2010-06-24 08:08:41 7

show current directory

Opens a file or URL in the user's preferred application.
This is sample output - yours may be different.
2

xdg-open .

karpoke · 2009-09-09 07:20:32 7
Make a statistic about the lines of code

This is really fast :) time find . -name \*.c | xargs wc -l | tail -1 | awk '{print $1}' 204753 real 0m0.191s user 0m0.068s sys 0m0.116s Show Sample Output
This is sample output - yours may be different.
```
204753
```
0

find . -name \*.c | xargs wc -l | tail -1 | awk '{print $1}'

karpoke · 2009-09-08 08:25:45 4

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paste one file at a time instead of in parallel

random xkcd comic

i sorta stole this from http://www.shell-fu.org/lister.php?id=878#MTC_form but it didn't work, so here it is, fixed. --- updated to work with jpegs, and to use a fancy positive look behind assertion.

Remove color codes (special characters) with sed

Removes ANSI color and end of line codes to the [{attr1};...;{attrn}m format.

Sort contents of a directory with human readable output

Show sizes of all files and directories in a directory in size order. $du -hs * | sort -hr for reverse order. Taken from http://serverfault.com/questions/62411/how-can-i-sort-du-h-output-by-size

list block devices

Shows all block devices in a tree with descruptions of what they are.

Display packages and versions on Debian/Ubuntu distrib

Need admin right to run dpkg-query

When was your OS installed?

Show time and date when you installed your OS.

5 Which Aliases

5 helpful aliases for using the which utility, specifically for the GNU which (2.16 tested) that is included in coreutils. Which is run first for a command. Same as type builtin minus verbosity $ alias which='{ command alias; command declare -f; } | command which --read-functions --read-alias' Which (a)lias $ alias whicha='command alias | command which --read-alias' Which (f)unction $ alias whichf='command declare -f | command which --read-functions' Which e(x)ecutable file in PATH $ alias whichx='command which' Which (all) alias, function, builtin, and files in PATH $ alias whichall='{ command alias; command declare -f; } | command which --read-functions --read-alias -a' # From my .bash_profile http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

continuously print string as if being entered from the keyboard

Cycles continuously through a string printing each character with a random delay less than 1 second. First parameter is min, 2nd is max. Example: 1 3 means sleep random .1 to .3. Experiment with different values. The 3rd parameter is the string. The sleep will help with battery life/power consumption. $ cycle 1 3 $(openssl rand 100 | xxd -p) Fans of "The Shining" might get a kick out of this: $ cycle 1 4 ' All work and no play makes Jack a dull boy.'

Edit a file inside a compressed archive without extracting it

If you vim a compressed file it will list all archive content, then you can pickup any of them for editing and saving. There you have the modified archive without any extra step. It supports many file types such as tar.gz, tgz, zip, etc.

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