Shell-array summary

Shell-array summary array is often used in shell scripts. Sort out the common variable formats of arrays: 1. define an array: array (array1array2array3) // use spaces in parentheses to differentiate arrays. the third value of the output array: echo $ {array [2]}... shell-array summary array is often used in shell scripts. Sort out the common variable formats of arrays: 1. define an array: array = (array1 array2 array3) // use spaces in parentheses to differentiate arrays. the third value of the output array: echo $ {array [2]} // The subscript starts from 0. list all values in the array: echo $ {array [@]} echo $ {array [*]} // both can be 4. output array length: echo $ {# array [*]} echo $ {# array [@]} // both can be PS: a very stupid way to get the length by traversing the array: for I in $ {array [@]} do if [-n $ I] then I =$ ($ I + 1) fidoneecho $ I