Commands by javidjamae

Commands by javidjamae (3)

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Get the date for the last Saturday of a given month

This is a little trickier than finding the last Sunday, because you know the last Sunday is in the first position of the last line. The trick is to use the NF less than or equal to 7 so it picks up all the lines then grep out any empty lines. Show Sample Output
This is sample output - yours may be different.
```
28
```
-2

cal 04 2012 | awk 'NF <= 7 { print $7 }' | grep -v "^$" | tail -1

javidjamae · 2012-05-03 16:57:45 767
Remove a range of lines from a file

Deletes lines to of a file. You must put the end line first in the range for the curly brace expansion, otherwise it will not work properly. Show Sample Output
This is sample output - yours may be different.
```
$ echo -en \\b{1..4}\\n > file.txt
$ cat file.txt
1
2
3
4
$ vi +{3..2}d +wq file.txt
$ cat file.txt
1
4
```
1

vi +{<end>..<start>}d +wq <filename>

javidjamae · 2012-01-26 20:36:04 8
Quickly create an alias for changing into the current directory

Put the function in your .bashrc and use "map [alias]" to create the alias you want. Just be careful to not override an existing alias. Show Sample Output
This is sample output - yours may be different.
```
~ $ cd /some/deep/down/path/to/my/logs
logs $ map log
logs $ cd /some/other/path/to/my/configs
configs $ map conf
configs $ cd
~ $ log
logs $ conf
configs $
```
1

map() { if [ "$1" != "" ]; then alias $1="cd `pwd`"; fi }

javidjamae · 2011-07-11 15:46:19 9

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Rename files in batch

Remove all unused kernels with apt-get

A little aptitude magic. Note: this will remove images AND headers. If you just want to remove images: aptitude remove ?and(~i~nlinux-im ?not(~n`uname -r`)) I used this in zsh without any problems. I'm not sure how other shells will interpret some of the special characters used in the aptitude search terms. Use -s to simulate.

most used unix commands

Quickly batch resize images

-geometry (preserves values of height and width given, and aspect ratio). WARNING: While 'resize' creates resized copies of original files, 'mogrify' works on the original files, replacing them. It will overwrite the source files, use with caution, and backup regularly.

separate (emphasize) digital strings from other text

one-liner mpc track changer using dmenu

Add a [fluxbox] binding in your key file then this command provides a dmenu selector for the next track to play

list files recursively by size

listen to ram

grep tab chars

mixing tabs and spaces for indentation in python would confuse the python interpreter, to avoid that, check if the file has any tab based indentation. "^V" => denotes press control + v and press tab within quotes. $ cat improper_indent.py class Tux(object): print "Hello world.." $ grep " " improper_indent.py print "Hello world.."

Change a specific value in a path

Awk replaces the value of a specific field while retaining the field separator "/" .

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