Difference between revisions of "Bash array"
From thelinuxwiki
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== List all elements of original array. == | == List all elements of original array. == | ||
echo "original_array = ${original_array[@]}" | echo "original_array = ${original_array[@]}" | ||
| − | |||
== Get array length == | == Get array length == | ||
echo ${#distro[@]} | echo ${#distro[@]} | ||
| + | |||
| + | == loop / iterate through array == | ||
| + | for i in ${array-name[@]} | ||
| + | do | ||
| + | print $i | ||
| + | done | ||
| + | |||
[[category:bash]] | [[category:bash]] | ||
Latest revision as of 19:53, 2 October 2013
Arrays do not to be declared. Bash allows on dimensional arrays.
Contents |
Accessing arrays
where array = array name
${array[*]} # All of the items in the array (single word)
${array[@]} # All items of array (separate words, add quotes if words have spaces)
${!array[*]} # All of the indexes in the array
${#array[*]} #Number of items in the array
or ${#array[@]} ???
${#array[0]} # Length of item zero
Example Array 1:
#!/bin/bash
function test_function {
color[1]=red # <<< array assignments
color[2]=white # <<< array assignments
color[3]=blue # <<< array assignments
# Using brace expansion ...
# Bash, version 3+.
for a in {1..3}
do
echo "${color[$a]}" #<<< curly braces needed !!!!
done
}
#main body
test_function # the function msut be invoked below or after it is defined
Example Array 2
#!/bin/bash
function test_function {
color=( zero one two three ) # <<< array assignments
# Using brace expansion ...
# Bash, version 3+.
for a in {1..3}
do
echo "${color[$a]}" #<<< curly braces needed !!!!
done
}
#main body
test_function # the function msut be invoked below or after it is defined
echo "original_array = ${color[@]}"
List all elements of original array.
echo "original_array = ${original_array[@]}"
Get array length
echo ${#distro[@]}
loop / iterate through array
for i in ${array-name[@]}
do
print $i
done
