3.5 KiB
- Assignments escape special built-ins
- Temporary assignments escape special built-ins
- Updates of temporary assignments escape special built-ins
- Temporary assignments are not exported in special built-ins
- Temporary exports do not escape special built-ins
- Exports escape special built-ins
- Exports of temporary assignments escape special built-ins
- Assignments escape functions
- Temporary assignments do not escape functions
- Updates of temporary assignments do not escape functions
- Temporary assignments are not exported in functions
- Temporary exports do not escape functions
- Exports escape functions
- Exports of temporary assignments do not escape functions
- Read-only temporary assignments do not escape functions
;;; Gash – Guile As SHell ;;; Copyright © 2019 Timothy Sample <samplet@ngyro.com> ;;; ;;; This file is part of Gash. ;;; ;;; Gash is free software: you can redistribute it and/or modify ;;; it under the terms of the GNU General Public License as published by ;;; the Free Software Foundation, either version 3 of the License, or ;;; (at your option) any later version. ;;; ;;; Gash is distributed in the hope that it will be useful, ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;;; GNU General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with Gash. If not, see <http://www.gnu.org/licenses/>.
;; Special built-ins
Assignments escape special built-ins
eval 'X=foo'
echo $X
:STDOUT:
foo
Temporary assignments escape special built-ins
X=bar eval 'X=foo'
echo $X
:STDOUT:
foo
Updates of temporary assignments escape special built-ins
X=foo
X=bar eval 'X=baz'
echo $X
:STDOUT:
baz
Temporary assignments are not exported in special built-ins
X=foo eval 'guile -c '\''(format #t "~a~%" (getenv "X"))'\'
:STDOUT:
#f
Temporary exports do not escape special built-ins
X=bar
X=foo :
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
#f
Exports escape special built-ins
X=foo
eval 'export X'
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
foo
Exports of temporary assignments escape special built-ins
X=foo eval 'export X'
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
foo
;; Functions
Assignments escape functions
f() {
X=foo
}
f
echo $X
:STDOUT:
foo
Temporary assignments do not escape functions
f() {
X=foo
}
X=bar f
echo $X
:STDOUT:
Updates of temporary assignments do not escape functions
f() {
X=baz
}
X=foo
X=bar f
echo $X
:STDOUT:
foo
Temporary assignments are not exported in functions
f() {
guile -c '(format #t "~a~%" (getenv "X"))'
}
X=foo f
:STDOUT:
#f
Temporary exports do not escape functions
f() {
:
}
X=bar
X=foo f
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
#f
Exports escape functions
f() {
export X
}
X=foo
f
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
foo
Exports of temporary assignments do not escape functions
f() {
export X
}
X=foo f
guile -c '(format #t "~a~%" (getenv "X"))'
:STDOUT:
#f
Read-only temporary assignments do not escape functions
f() {
readonly X
}
X=foo f
echo $X
:STDOUT: