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-rw-r--r--examples/functions/sort-pos-params69
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+#
+# Chet Ramey <chet.ramey@case.edu>
+#
+# Copyright 2001 Chester Ramey
+#
+# 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 2, or (at your option)
+# any later version.
+#
+# TThis 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, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+# Sort the positional paramters.
+# Make sure the positional parameters are passed as arguments to the function.
+# If -u is the first arg, remove duplicate array members.
+sort_posparams()
+{
+ local -a R
+ local u
+
+ case "$1" in
+ -u) u=-u ; shift ;;
+ esac
+
+ # if you want the case of no positional parameters to return success,
+ # remove the error message and return 0
+ if [ $# -eq 0 ]; then
+ echo "$FUNCNAME: argument expected" >&2
+ return 1
+ fi
+
+ # make R a copy of the positional parameters
+ R=( "${@}" )
+
+ # sort R.
+ R=( $( printf "%s\n" "${R[@]}" | sort $u) )
+
+ printf "%s\n" "${R[@]}"
+ return 0
+}
+
+# will print everything on separate lines
+set -- 3 1 4 1 5 9 2 6 5 3 2
+sort_posparams "$@"
+
+# sets without preserving quoted parameters
+set -- $( sort_posparams "$@" )
+echo "$@"
+echo $#
+
+# sets preserving quoted parameters, beware pos params with embedded newlines
+set -- 'a b' 'a c' 'x z'
+
+oifs=$IFS
+IFS=$'\n'
+set -- $( sort_posparams "$@" )
+IFS="$oifs"
+
+echo "$@"
+echo $#
+
+sort_posparams