Tips and Tricks

Python

Auto-completion and history in python shell:

Create a .pythonrc file containing:

import readline

import rlcompleter

import atexit

import os

readline.parse_and_bind("\C-a: complete")

historyPath = os.path.expanduser("~/.pyhistory")

def save_history(historyPath=historyPath):

import readline

readline.write_history_file(historyPath)

if os.path.exists(historyPath):

readline.read_history_file(historyPath)

atexit.register(save_history)

del os, atexit, readline, rlcompleter, save_history, historyPath

and use the following environment:

export PYTHONSTARTUP=$HOME/.pythonrc

Bash

Avoid duplicate history:

export HISTCONTROL=ignoredups

Replace in string:

${i/glob_to_replace/replacing_glob}

History search:
- Execute last matching command:

!first_chars_of_command

print last matching command:

!first_chars_of_command:p

Mount iso file:

mount -o loop -t iso9660 file.iso /media/iso

Others

Encoding movie with subtitle:

mencoder -sub subtitle.srt -fontconfig -font Arial -subfont-text-scale 4 -oac mp3lame -lameopts cbr=128 -ovc xvid -xvidencopts bitrate=900 original.avi -o output.avi

Calculate cylinder numbers:

CYLINDERS = BYTES / HEADS / SECTOR_BY_TRACKS / SECTOR_SIZE

DMenu launching

 ** dmenu_run -i -nf '#888888' -nb '#222222' -sf '#ffffff' -sb '#285577'