wdir=$PWD
# this is needed because posix mode restricts tilde expansion to assignment
# statements preceding a command, instead of the default of expanding all
# assignment statements on the line (e.g., after `export').  Without this,
# the next-to-last test fails
set +o posix

HOME=/usr/xyz
SHELL=~/bash
echo ~ch\et
echo ~/"foo"
echo "~chet"/"foo"
echo \~chet/"foo"
echo \~chet/bar
echo ~\chet/bar
echo ~chet""/bar
echo ":~chet/"
echo abcd~chet
echo "SHELL=~/bash"
echo $SHELL
echo abcd:~chet
path=/usr/ucb:/bin:~/bin:~/tmp/bin:/usr/bin
echo $path

cd /usr
cd /tmp
echo ~-
echo ~+

XPATH=/bin:/usr/bin:.

# yes tilde expansion
PPATH=$XPATH:~/bin
echo "$PPATH"

# no tilde expansion
PPATH="$XPATH:~/bin"
echo "$PPATH"

# yes tilde expansion
export PPATH=$XPATH:~/bin
echo "$PPATH"
declare -x PPATH=$XPATH:~/bin
echo "$PPATH"

# no tilde expansion
export PPATH="$XPATH:~/bin"
echo "$PPATH"
declare -x PPATH="$XPATH:~/bin"
echo "$PPATH"

printf "%q\n" '~'

# more tests of tilde expansion when executing case commands
case ~ in
$HOME)	echo ok 1;;
*) echo bad 1 ;;
esac

case ~ in
~)	echo ok 2 ;;
\~)	echo bad 2a ;;
*)	echo bad 2b ;;
esac

case $unset in
"")	echo ok 3 ;;
*)	echo bad 3 ;;
esac

USER=root		# should exist just about everywhere
echo ~$USER

cd "$wdir"
exit 0
