Home>

how to check exit status with substitution of command result in bash

I checked it out, but I can't do it easily.
Suppose you make the following substitution in a Bash script.

function () {
  result = $(command)
}


At this time, the result ofcommandis assigned toresult, and the exit status of thiscommandis checked at the same time.

In the article here , you can write it as follows It actually worked well. However, ifresultis a local variable, it will not work. Why is this so?

function () {
  status = 0
  result = $(command) || status = $?
  echo $status # This is displayed as 128
}
function () {
  local status = 0
  local result = $(command) || status = $?
  echo $status # will always be 0
}
bash
  • Answer # 1

    local itself seems to be a command, and when it succeeds in creating a local variable, it returns 0, so it seems to overwrite the exit status.
    So, it was necessary to create a local variable with local first and then assign it.

    function () {
  local status = 0
  local result = $(command) || status = $?
  echo $result # will always be 0
}

Related articles