bash snippets

String function

len() in bash

$ var='Hello, World!'
$ echo "${#var}"
13

left() in bash

$ var='Hello, World!'
#${string:position:length}
$ echo "${var:0:5}"
Hello

right() in bash

$ var='Hello, World!'
#${string:position:length}
$ echo "${var:7:${#var}}"
World!
#or a litte more dynamic.. (the 6 most right chars)
echo "${var:$((${#var}-6)):${#var}}"
World!

mid() in bash

$ var='Hello, World!'
#${string:position:length}
$ echo "${var:4:4}"
o, W

string replace first in bash (substitute)

$ var='Hello, World!'
#${string/substring/replacement}
$ echo "${var/o/a}"
Hella, World!

string replace all in bash (substitute)

$ var='Hello, World!'
#${string//substring/replacement}
$ echo "${var//o/a}"
Hella, Warld!

Reference: http://www.netmess.org/tag/bash/

bash

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Bernhard Brunner's Blog

Table of Contents

bash snippets

String function

len() in bash

left() in bash

right() in bash

mid() in bash

string replace first in bash (substitute)

string replace all in bash (substitute)

Discussion