Bash: Difference between revisions
From charlesreid1
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Looping in bash is really simple, and convenient - you can use other unix commands (most obviously "ls") to create lists, and then loop over each element of those lists. For example, if I want to print out the name of every file in my home directory (granted, not very useful, but this is just an example), I can do this: | Looping in bash is really simple, and convenient - you can use other unix commands (most obviously "ls") to create lists, and then loop over each element of those lists. For example, if I want to print out the name of every file in my home directory (granted, not very useful, but this is just an example), I can do this: | ||
< | <source lang="bash"> | ||
for i in `/bin/ls -1 $HOME`; do | for i in `/bin/ls -1 $HOME`; do | ||
| Line 35: | Line 35: | ||
done | done | ||
</ | </source> | ||
To do some serious bash looping kung-fu, check out [[Xargs]]. | |||
== Math == | == Math == | ||
Revision as of 08:42, 12 April 2011
Bash Guide
Using Bash
Setting the default shell: http://www.unix.com/shell-programming-scripting/32664-how-change-default-shell-linux.html
Startup Process
source /etc/profile
source ~/.profile
(source ~/.bash_profile?)
source /etc/bashrc
source ~/.bashrc
Dot Files
Bash Scripting
Looping
Looping in bash is really simple, and convenient - you can use other unix commands (most obviously "ls") to create lists, and then loop over each element of those lists. For example, if I want to print out the name of every file in my home directory (granted, not very useful, but this is just an example), I can do this:
for i in `/bin/ls -1 $HOME`; do
echo $i
done
To do some serious bash looping kung-fu, check out Xargs.
Math
Bash Commands
Editing Commands
The following are keyboard shortcuts for easy navigation/editing of commands that are on the Bash command line.
Movement
- C-a - Move to beginning of line
- C-e - Move to end of line
- M-f - Move forward 1 word
- M-b - Move backward 1 word
- C-f - Move forward 1 character
- C-b - Move backward 1 character
Cutting and Pasting
- C-k - kill (cut) from cursor to end of line
- C-w - kill (cut) from cursor to previous whitespace
- C-y - yank (paste) previously killed text at cursor
Uncategorized
- C-L - clear screen, reprint current line at top
- C-u - undo last edit
- C-d - delete character under cursor
References
Floating point math in the shell:
http://www.novell.com/coolsolutions/tools/17043.html
Fast bash math:
http://www.bytemycode.com/snippets/snippet/350/
Bash script iterate through array of values
http://www.tech-recipes.com/rx/636/bash-shell-script-iterate-through-array-values/