bash snippets

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/

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