Add a new element to an array without specifying the index in Bash

Question

Is there a way to do something like PHPs  array      foo   in bash vs doing   array 0   foo  array 1   bar

User · Answer

With an indexed array  you can to something like this   declare -a a    a    foo   bar

User · Answer

declare -a arr   arr   a     arr     arr       new     echo   arr     a new   arr     arr       newest     echo   arr     a new newest

User · Answer

As Dumb Guy points out  it s important to note whether the array starts at zero and is sequential  Since you can make assignments to and unset non-contiguous indices    array     is not always the next item at the end of the array     array  a b c d e f g h    array 42   i    unset array 2    unset array 3    declare -p array       dump the array so we can see what it contains declare -a array    0   a   1   b   4   e   5   f   6   g   7   h   42   i      echo    array     7   echo   array    array       h   Here s how to get the last index     end     array          put all the indices in an array   end   end     -1       get the last one   echo  end 42   That illustrates how to get the last element of an array  You ll often see this     echo   array    array     - 1   g   As you can see  because we re dealing with a sparse array  this isn t the last element  This works on both sparse and contiguous arrays  though     echo   array     -1  i

User · Answer

Yes there is   ARRAY    ARRAY    foo   ARRAY    bar     Bash Reference Manual      In the context where an assignment statement is assigning a value to a shell variable or array index  see Arrays   the          operator can be used to append to or add to the variable s previous value

User · Answer

If your array is always sequential and starts at 0  then you can do this   array    array       foo     gets the length of the array    array name       If you inadvertently use spaces between the equal sign   array    array         foo    Then you will receive an error similar to   array name 3   command not found

[bash] Add a new element to an array without specifying the index in Bash

Examples related to bash

Examples related to arrays