CLI Knowledge Base
Brace Expansion
Examples
Rename or backup a file or folder
cp -v some_file{,~}.html
Create multiple folders
mkdir -pv text~{0..2}
Use a template to create multiple files
for f in some_file_0{1..9}.html ; do cp -v template.html $f ; done
Integer or character ranges 1
mv -v 2018_0{1..5}* 2018/echo {a..f}.txt
String lists2
mkdir /home/bash/test/{foo,bar,baz,cat,dog}
Increment 2
{<START>..<END>..<INCR>}
$ touch 2018_0{1..9..1}.txt
$ ls -1 2018_01.txt 2018_02.txt 2018_03.txt 2018_04.txt 2018_05.txt 2018_06.txt 2018_07.txt 2018_08.txt 2018_09.txt
Get last field (space delimited) 3
${var##* }
Example:
$ var='foo bar spam egg'
$ echo "${var##* }"
egg
NULL