YASDUT #4

Line Numbering

To add line numbering to an existing file, you can simply use ‘nl’ which adds line number to a given input text and redirect the output to a new file:

nl foo.bar > foo.bar.num

Read the man pages for more options!

YASDUT #3

List Only Directories

There are many ways to list only directories of a given parent directory. Here is one of them:

ls -l | grep "^d"

You can define a fancy alias like ‘lsd’ to avoid typing a lot every time

alias lsd 'ls -l | grep "^d"'

YASDUT #2

Hotkeys in Bash

Most o the bash users only uses the Ctrl+C and Ctrl+D command to stop a process or quickly kill the shell, but there are more useful hotkeys in a bash shell:

• ctrl-c kill the current command/process
• ctrl-d kill the shell
• ctrl-l clear the screen
• ctrl-r search in the previously given commands
• esc-p like ctrl-r lets you search through the previously given commands
• ctrl-u clears the typing before the hotkey
• ctrl-a jump to the begining of the command you are currently typing
• ctrl-e jump to the end of the command you are currently typing in
• esc-b take you back by one word while typing a command
• ctrl-h delete one letter at a time from the command you are typing in
• ctrl-z pus the currently running process in background, the process can be brought back to run state by using ‘fg’.
• esc-. the last command you typed