gash/tests/command-substitution.org

• for-substitution
• substitution-assignment-at
• substitution-assignment
• substitution-backtick
• substitution-redirect
• substitution
• substitution-word

;;; Gash – Guile As SHell ;;; Copyright © 2016, 2017, 2018 R.E.W. van Beusekom <rutger.van.beusekom@gmail.com> ;;; Copyright © 2018, 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> ;;; 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/>.

for-substitution

  for file in `echo foo.o bar.o`; do
      echo compiling $file...
  done

:STDOUT:

  compiling foo.o...
  compiling bar.o...

substitution-assignment-at

  cmdline=$(echo " $@")
  echo cmdline:$cmdline

:args: ("-s" "–long" "file0" "file1")

:STDOUT:

  cmdline: -s --long file0 file1

substitution-assignment

  echo=$(echo 1 2 3)
  echo echo=$echo

:STDOUT:

  echo=1 2 3

substitution-backtick

  echo `echo 1 2 3`

:STDOUT:

  1 2 3

substitution-redirect

  echo $(echo foo bar baz 2>/dev/null)

:STDOUT:

  foo bar baz

substitution

  echo $(echo 1 2 3)

:STDOUT:

  1 2 3

substitution-word

  echo foo $(echo bar)/baz

:STDOUT:

  foo bar/baz