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+#!/usr/bin/env bash
+
+# Copyright (C) 2016-2022 Ole Tange, http://ole.tange.dk and Free
+# Software Foundation, Inc.
+#
+# This program 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.
+#
+# This program 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 this program; if not, see <http://www.gnu.org/licenses/>
+# or write to the Free Software Foundation, Inc., 51 Franklin St,
+# Fifth Floor, Boston, MA 02110-1301 USA
+#
+# SPDX-FileCopyrightText: 2021-2022 Ole Tange, http://ole.tange.dk and Free Software and Foundation, Inc.
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+grepq() {
+ # grep -q for systems without -q
+ grep >/dev/null 2>/dev/null "$@"
+}
+
+installer() {
+ source="$1"
+ script="$2"
+ into="$3"
+ if grepq $script "$into"; then
+ true already installed
+ else
+ echo $source \`which $script\` >> "$into"
+ fi
+}
+
+while test $# -gt 0; do
+ key="$1"
+
+ case $key in
+ -i|--install)
+ installer . env_parallel.bash "$HOME"/.bashrc
+ installer . env_parallel.sh "$HOME"/.shrc
+ installer . env_parallel.zsh "$HOME"/.zshenv
+ installer source env_parallel.ksh "$HOME"/.kshrc
+ installer source env_parallel.mksh "$HOME"/.mkshrc
+ echo $SHELL | grepq /pdksh &&
+ installer . env_parallel.pdksh "$HOME"/.profile
+ echo $SHELL | grepq /ash &&
+ installer . env_parallel.ash "$HOME"/.profile
+ echo $SHELL | grepq /dash &&
+ installer . env_parallel.dash "$HOME"/.profile
+ installer source env_parallel.csh "$HOME"/.cshrc
+ installer source env_parallel.tcsh "$HOME"/.tcshrc
+ mkdir -p "$HOME"/.config/fish
+ grepq env_parallel.fish "$HOME"/.config/fish/config.fish ||
+ echo '. (which env_parallel.fish)' >> "$HOME"/.config/fish/config.fish
+ echo 'Installed env_parallel in:'
+ echo " " "$HOME"/.bashrc
+ echo " " "$HOME"/.shrc
+ echo " " "$HOME"/.zshenv
+ echo " " "$HOME"/.config/fish/config.fish
+ echo " " "$HOME"/.kshrc
+ echo " " "$HOME"/.mkshrc
+ echo " " "$HOME"/.profile
+ echo " " "$HOME"/.cshrc
+ echo " " "$HOME"/.tcshrc
+ exit
+ ;;
+ *)
+ echo "Unknown option: $key"
+ ;;
+ esac
+ shift # past argument or value
+done
+
+
+cat <<'_EOS'
+env_parallel only works if it is a function.
+
+Do this and restart your shell:
+
+bash: Put this in $HOME/.bashrc: . `which env_parallel.bash`
+ E.g. by doing: echo '. `which env_parallel.bash`' >> $HOME/.bashrc
+ Supports: variables, aliases, functions, arrays
+
+fish: Put this in $HOME/.config/fish/config.fish: . (which env_parallel.fish)
+ E.g. by doing:
+ echo '. (which env_parallel.fish)' >> $HOME/.config/fish/config.fish
+ Supports: variables, aliases, functions, arrays
+
+ksh: Put this in $HOME/.kshrc: source `which env_parallel.ksh`
+ E.g. by doing: echo 'source `which env_parallel.ksh`' >> $HOME/.kshrc
+ Supports: variables, aliases, functions, arrays
+
+mksh: Put this in $HOME/.mkshrc: source `which env_parallel.mksh`
+ E.g. by doing: echo 'source `which env_parallel.mksh`' >> $HOME/.mkshrc
+ Supports: variables, aliases, functions, arrays
+
+pdksh: Put this in $HOME/.profile: source `which env_parallel.pdksh`
+ E.g. by doing: echo '. `which env_parallel.pdksh`' >> $HOME/.profile
+ Supports: variables, aliases, functions, arrays
+
+zsh: Put this in $HOME/.zshrc: . `which env_parallel.zsh`
+ E.g. by doing: echo '. `which env_parallel.zsh`' >> $HOME/.zshenv
+ Supports: variables, functions, arrays
+
+ash: Put this in $HOME/.profile: . `which env_parallel.ash`
+ E.g. by doing: echo '. `which env_parallel.ash`' >> $HOME/.profile
+ Supports: variables, aliases
+
+dash: Put this in $HOME/.profile: . `which env_parallel.dash`
+ E.g. by doing: echo '. `which env_parallel.dash`' >> $HOME/.profile
+ Supports: variables, aliases
+
+csh: Put this in $HOME/.cshrc: source `which env_parallel.csh`
+ E.g. by doing: echo 'source `which env_parallel.csh`' >> $HOME/.cshrc
+ Supports: variables, aliases, arrays with no special chars
+
+tcsh: Put this in $HOME/.tcshrc: source `which env_parallel.tcsh`
+ E.g. by doing: echo 'source `which env_parallel.tcsh`' >> $HOME/.tcshrc
+ Supports: variables, aliases, arrays with no special chars
+
+To install in all shells run:
+
+ env_parallel --install
+
+In a script you need to run this before using env_parallel:
+
+bash: . `which env_parallel.bash`
+ksh: source `which env_parallel.ksh`
+mksh: source `which env_parallel.mksh`
+pdksh: source `which env_parallel.pdksh`
+zsh: . `which env_parallel.zsh`
+ash: . `which env_parallel.ash`
+dash: . `which env_parallel.dash`
+
+For details: see man env_parallel
+
+_EOS