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76 lines
1.9 KiB
Markdown
76 lines
1.9 KiB
Markdown
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---
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title: bash Tips & Tricks
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layout: default
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created: 2008-08-01 22:41:34 +0200
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updated: 2009-02-08 14:32:54 +0100
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toc: false
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tags:
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- know-how
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- software
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- linux
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- software
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- bash
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---
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Bourne Again Shell.
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bash magic
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==========
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Some handy `bash` magic.
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sudo last command
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-----------------
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sudo !!
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If you forgot `sudo` after executing your 3-lines-command, sudo *bang! bang!* will repeat the last entered command with `sudo` prefixed.
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More parameter magic
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--------------------
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| *bang* | Expands to |
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|:----------:|:-----------|
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| `!$` | last argument of previous command |
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| `!$:p` | just show last argument of previous command, don't add to commandline |
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| `!*` | **all** arguments of previous command |
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| `!!:1` | first argument of previous command |
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| `!vi` | last command that started with "*vi*" |
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| `!vi:p` | just show last "*vi*"-call, don't run it again |
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| `^err^corr` | replace all occurrences of `err` by `corr` in the last command |
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Shortcuts
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---------
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| *keypress* | Description |
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|:------------:|:---------------|
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| <kbd>Ctrl</kbd>+<kbd>w</kbd> | Erase word |
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| <kbd>Ctrl</kbd>+<kbd>u</kbd> | Erase from cursor to beginning of line |
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| <kbd>Ctrl</kbd>+<kbd>a</kbd> | Move cursor to beginning of line |
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| <kbd>Ctrl</kbd>+<kbd>e</kbd> | Move cursor to end of line |
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| <kbd>Ctrl</kbd>+<kbd>r</kbd> | Search command history (type letters after this) |
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chdir to last one
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-----------------
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cd -
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Changes to previous directory.
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Use output of previous command
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------------------------------
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Sometimes it's handy to use the output of a previous command, e.g. a `which`. To do that, simply use the *bang-bang* with the backtick operator:
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$ which php
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/usr/bin/php
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$ ls -l `!!`
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ls -l `which php`
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lrwxrwxrwx 1 root root 21 2008-06-12 02:47 /usr/bin/php -> /etc/alternatives/php
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$ _
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