$ cat test12 #!/bin/bash # returning an array value function arraydblr { local origarray local newarray local elements local i origarray=($(echo "$@")) newarray=($(echo "$@")) elements=$[ $# - 1 ] for (( i = 0; i <= $elements; i++ )) { newarray[$i]=$[ ${orig...
The example above,${fruits[@]}expands to the entire contents of the array and substitutes it into the compound assignment, then assigns the new value into thefruitsarray mutating its original value. Deleting elements from an array To delete an element from an array, use theunsetcommand: unset...
"helvetica="" pingfang=""> 本文目录 1 局部变量与环境变量 2 设置变量 3 环境变量 局部变量与...
the expanded value as the name of a file to read and execute. Bash behaves as if the fol‐ lowing command were executed: if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi but the value of the PATH variable is not used to search for the filename. If bash is invoked with the n...
Used to create an array of strings. ${array[0]} Used to get the first element of the array. ${array[*]} Used to get all values in the array. ${array[1]} Get the last value in the array. ${array[@]} Expand all of the array elements. shift Move argument from $2 to $1. ...
Creating an array The following creates an array with three elements and assigns the array to the variable named my_array. my_array=('Alex' 'Ada' 'Alexandra') Copy snippet Adding an element to an array The following uses the += operator to add an element with the value Soto to the arr...
To retrieve the array you need to useparameter expansion, which involves the dollar sign and curly brackets (${ }). The positions of the elements in the array are numbered starting from zero. To get the first element of this array use${plagues[0]}like so: ...
Adding and Removing Elements You can add elements to a Bash array using the+=operator. To remove elements, you can use theunsetcommand. Here’s an example: # Adding an elementcountries=("USA""UK""Canada")countries+=("Australia")# Printing the updated arrayecho${countries[@]}# Output:#...
So, let’s use aforloop to iterate over the original array in reverse order and add each element to thereversed_numbersarray: #!/bin/bash # Initialize the original array numbers_array=(1 2 3 4) # Create a new array to hold the reversed elements reversed_numbers=() # Get the length...
unsetting array elements cause aliases to be removed from the alias list.（然后傲娇地写了一个更好...