arrays bash

/via: http://www.thegeekstuff.com/2010/06/bash-array-tutorial/

array=(valor0 'valor uno' 'valor dos')

array[0]='valor0'
array[1]='valor uno'
array[2]='valor dos'

declare -a array=(valor0 'valor uno' 'valor dos')

• todo el array: echo ${array[@]}
• un elemento: echo ${array[n]}
• del elemento n al m: echo ${array[@]:n:m}
• del elemento n, subcadena a-b: echo ${array[n]:a:b}

• del array: echo ${#array[@]}
• del primer elemento: echo ${#array}
• del tercero: echo ${#array[2]}

• añadir elemento(s) a un array existente: array=(«${array[@]}» «valor 3» «valor 4»)
• eliminar un elemento n: unset array[n]
  • existe forma de eliminar el índice o eliminar por patrón
• eliminar un array: unset array
• cambiar string1 por string2: ${array[@]/string1/string2}
• copiar un array: new_array=(«${array[@]}»)
• concatenar arrays: new_new_array=(«${array[@]}» «${new_array[@]}»)

• array=(` cat file `)

• todos los items del array: ${array[*]}
• todos los índices del array: ${!array[*]}
• número de items: ${#array[*]}
• vía: http://www.linuxjournal.com/content/bash-arrays

#!/bin/bash

array=("first item" "second item" "third" "item")

echo "Number of items in original array: ${#array[*]}"
for ix in ${!array[*]}
do
    printf "   %s\n" "${array[$ix]}"
done
echo

arr=(${array[*]})
echo "After unquoted expansion: ${#arr[*]}"
for ix in ${!arr[*]}
do
    printf "   %s\n" "${arr[$ix]}"
done
echo

arr=("${array[*]}")
echo "After * quoted expansion: ${#arr[*]}"
for ix in ${!arr[*]}
do
    printf "   %s\n" "${arr[$ix]}"
done
echo

arr=("${array[@]}")
echo "After @ quoted expansion: ${#arr[*]}"
for ix in ${!arr[*]}
do
    printf "   %s\n" "${arr[$ix]}"
done

Number of items in original array: 4
   first item
   second item
   third
   item
 
After unquoted expansion: 6
   first
   item
   second
   item
   third
   item
 
After * quoted expansion: 1
   first item second item third item
 
After @ quoted expansion: 4
   first item
   second item
   third
   item