hakandilek/bash-arrays.md

Created March 12, 2021 11:16

Star () You must be signed in to star a gist
Fork () You must be signed in to fork a gist

Learn more about clone URLs
Clone this repository at <script src="https://gist.github.com/hakandilek/e2fdfbbe0c383a6ca2e8dc96ba40a97e.js"></script>
Save hakandilek/e2fdfbbe0c383a6ca2e8dc96ba40a97e to your computer and use it in GitHub Desktop.

bash arrays

Raw

    
Syntax
Description

arr=()
Create an empty array

arr=(1 2 3)
Initialize array

${arr[2]}
Retrieve third element

${arr[@]}
Retrieve all elements

${!arr[@]}
Retrieve array indices

${#arr[@]}
Calculate array size

arr[0]=3
Overwrite 1st element

arr+=(4)
Append value(s)

str=$(ls)
Save ls output as a string

arr=( $(ls) )
Save ls output as an array of files

${arr[@]:s:n}
Retrieve n elements starting at index s

Syntax	Description
`arr=()`	Create an empty array
`arr=(1 2 3)`	Initialize array
`${arr[2]}`	Retrieve third element
`${arr[@]}`	Retrieve all elements
`${!arr[@]}`	Retrieve array indices
`${#arr[@]}`	Calculate array size
`arr[0]=3`	Overwrite 1st element
`arr+=(4)`	Append value(s)
`str=$(ls)`	Save ls output as a string
`arr=( $(ls) )`	Save ls output as an array of files
`${arr[@]:s:n}`	Retrieve n elements starting at index s