echo "Single Quote"
echo 'foo
bar'
echo 'foo
bar'
echo 'foo\
bar'

echo "Double Quote"
echo "foo
bar"
echo "foo
bar"
echo "foo\
bar" 

echo "Backslash Single Quote"
echo `echo 'foo
bar'`   
echo `echo 'foo  
bar'`   
echo `echo 'foo\
bar'`  

echo "Backslash Double Quote"
echo `echo "foo
bar"`
echo `echo "foo
bar"`
echo `echo "foo\
bar"`

echo "Double Quote Backslash Single Quote"
echo "`echo 'foo
bar'`"
echo "`echo 'foo
bar'`"
echo "`echo 'foo\
bar'`"

echo "Dollar Paren Single Quote"
echo $(echo 'foo
bar')
echo $(echo 'foo
bar')
echo $(echo 'foo\
bar')

echo "Dollar Paren Double Quote"
echo $(echo "foo
bar")
echo $(echo "foo
bar")
echo $(echo "foo\
bar")

echo "Double Quote Dollar Paren Single Quote"
echo "$(echo 'foo
bar')"
echo "$(echo 'foo
bar')"
echo "$(echo 'foo\
bar')"

# old-style command substitution parsing compatibility tests -- post bash-3.1
recho 'foo \\
bar'

recho 'foo \
bar'

echo `recho sed -e 's/[	:]/\\
/g'`

echo `recho sed -e 's/[	:]/\
/g'`

echo `recho 'foo\\
bar'`

echo `recho 'foo\
bar'`  

echo $(recho 'foo\
bar')

a=`echo 'a b c' | sed 's/ /\\
/g' | grep 'b'`
echo $a
a=`echo 'a b c' | sed 's/ /\\
/g'`
echo "$a"

recho `echo 'a\' b`

recho `echo '\$' bab`
recho `echo '\$foo' bab`
recho `echo '$foo' bab`

recho `echo '\`' ab`

recho `echo '\\' ab`

echo `echo '${'`

recho `echo "(\\")"`
# produces no output
: `: "\\""`
# ultimate workaround
recho `echo "(\")"`