Cara keluar dari fungsi di bash

Bagaimana Anda keluar dari suatu fungsi jika kondisi benar tanpa mematikan seluruh skrip, cukup kembali ke sebelum Anda memanggil fungsi.

Contoh

# Start script
Do scripty stuff here
Ok now lets call FUNCT
FUNCT
Here is A to come back to

function FUNCT {
  if [ blah is false ]; then
    exit the function and go up to A
  else
    keep running the function
  fi
}

Menggunakan:

return [n]

Dari help return

kembali : kembali [n]

Return from a shell function.

Causes a function or sourced script to exit with the return value
specified by N.  If N is omitted, the return status is that of the
last command executed within the function or script.

Exit Status:
Returns N, or failure if the shell is not executing a function or script.

Gunakan returnoperator:

function FUNCT {
  if [ blah is false ]; then
    return 1 # or return 0, or even you can omit the argument.
  else
    keep running the function
  fi
}

Jika Anda ingin kembali dari fungsi luar dengan kesalahan tanpa exiting, Anda dapat menggunakan trik ini:

do-something-complex() {
  # Using `return` here would only return from `fail`, not from `do-something-complex`.
  # Using `exit` would close the entire shell.
  # So we (ab)use a different feature. :)
  fail() { : "${__fail_fast:?$1}"; }

  nested-func() {
      try-this || fail "This didn't work"
      try-that || fail "That didn't work"
  }
  nested-func
}

Mencoba itu:

$ do-something-complex
try-this: command not found
bash: __fail_fast: This didn't work

Ini memiliki manfaat tambahan / kelemahan yang anda dapat mematikan fitur ini: __fail_fast=x do-something-complex.

Perhatikan bahwa ini menyebabkan fungsi terluar mengembalikan 1.