echo foo
history --help
#1339718290
export XVAR='exported'
#1339718298
echo supsup
#abcde
echo hello \
    second line \
    the `echo third` line \
    final line
another `command
    and arg` to skip
backticks `are not allowed`
a && echo valid construct
[[ x = y ]] && echo double brackets not allowed
(( 1 = 2 )) && echo double parens not allowed
posix_cmd_sub $(is not supported)
sleep 123