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# 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/>.
#
POSIXLY_CORRECT=1
x=2
x+=5 eval printf '"$x "'
echo "$x"
unset x
typeset -i x=2
x+=5 eval printf '"$x "'
echo "$x"
a=1
a+=4
echo $a
# idiotically, ksh93 makes these two cases differ (?)
a+=5 printenv a
a+=5 eval printf '"$a "'
echo $a
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