---
Title: Bash Tips & Tricks
date: 2018-11-11T16:01:15+01:00
Author: Olivier De Ram
Draft: false
Categories:
- administration
- development
Tags:
- bash
- script
Truncated: true
---
Usefull bash tips & tricks
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### Usefull CLI shortcuts:
Shortcut 			| Description
------------- 	| -------------
Ctrl+a 			| Jump to the beginning of the command line.
Ctrl+e 			| Jump to the end of the command line.
Ctrl+u 			| Clear from the cursor to the beginning of the command line.
Ctrl+k 			| Clear from the cursor to the end of the command line.
Ctrl+Left Arrow 	| Jump to the beginning of the previous word on the command line.
Ctrl+Right Arrow | Jump to the end of the next word on the command line.
Ctrl+r 			| Search the history list of commands for a pattern. 
Esc + .			| Copy the last word of the previous command on the current command line where the cursor is

### Redirect output:

Command | result
--- | ---
`> file` | redirect stdout to overwrite a file
`>> file` | redirect stdout to append to a file
`2> file` | redirect stderr to overwrite a file
`2> /dev/null` | discard stderr error messages by redirecting to /dev/null
`&> file`  _(OR `> file 2>&1`)_ | redirect stdout and stderr to overwrite the same file
`&>>` _(OR `>> file 2>&1`)_ | redirect stdout and stderr to append to the same file

### Create a function:
It's straightforward, use function to create a function, give it a usefull short name and put the statemants between curly brackets.  
Use $1 for the first argument, $2 for the second argument and so on...

``` bash
function <name> {
	<bashcommands>
}
```

For example the function logsearch which searches for the given string whitin all logfiles in the current directory:

``` bash
function logsearch {
	zgrep $1 ./*log
}
```

### Short scripts:

* Loop every file in path:

``` bash
for F in /path/to/files/*;
do
	echo "Files $F";
done
```

* Loop file line per line:

``` bash
while read LINE;
do
	echo $LINE;
done < file.txt
```