General

Table of Contents Overview Versions, etc.. Startup Terminal Aliases Command prompt Folder Processes Logon

Overview

RTFM : man COMMAND_NAME

Versions, etc..

List:

• kernel: uname -r
• distribution: lsb_release -a
• file manager xdg-mime query default inode/directory

Startup

All mount element in /etc/fstab are mounted on startup (except those with noauto option).

Terminal

Get default terminal (look for *)
sudo update-alternatives --config x-terminal-emulator
Default config file is ~/.bashrc , loaded at terminal start

Aliases

Overview

• list alias
• add alias ALIAS_NAME='COMMAND'
• remove unalias ALIAS_NAME
• run without alias \command
  

Sample: list

• in list
• directories blue and DIRECTORY_NAME/
• readable size
• print only file modification date and file name
• aligned

Gives alias ls='ls -lFh --color=always | awk '\''{print $5,$6,$7,$8,$9}'\'' | column -t'

Command prompt

Alter PS1 variable in .bashrc
PS1='\u \w $ ' => USER_NAME WORKING_DIRECTORY $

To format the prompt, use ASCII escape sequence

Use escape

Open	Body	Close
\[	ESCAPE_SEQUENCE	\]

Here's the codes

Escape sequence

Need	Syntax	Full (use around $foo)
red	\e[31m	\[\e[31m$foo\]
blue	\e[36m	\[\e[36m$foo\
bold	\e[1m	\[\e[1m$foo\
reset	\e[0m	No use with $foo

Always add \[\e[0m\] at end of PS1

Full list of escape codes

To get local-function feedback PS1='$(FUNCTION_NAME) :'

To dynamically return color-code

set_bash_prompt(){
    PS1="[\w] $(COLORCODING_FUNCTION_NAME) \$ "
}
PROMPT_COMMAND=set_bash_prompt

Folder

Overview:

• list last 5 modified files ls -ltr | tail -5
• get total size of files in directory matchin pattern du -csh *temp* | tail -1 | cut -f 1

Processes

Identify the binary location of a command
which COMMAND_NAME

Logon

User initialization scripts:

• main : ~/.bash_profile
• main in Ubuntu: ’~/.profile`
• system-wide environment variables /etc/environment
• all: echo exit | strace bash -li |& less | grep '^open'