Bash Tips & Tricks

Usefull bash tips & tricks

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…

function <name> {
	<bashcommands>
}

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

function logsearch {
	zgrep $1 ./*log
}

Short scripts:

  • Loop every file in path:
for F in /path/to/files/*;
do
	echo "Files $F";
done
  • Loop file line per line:
while read LINE;
do
	echo $LINE;
done < file.txt
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