On Sun, Jul 24, 2011 at 10:30 PM, lolilolicon <loliloli...@gmail.com> wrote: > On Sun, Jul 24, 2011 at 10:08 PM, Christian Neukirchen > <chneukirc...@gmail.com> wrote: >> anonymous <p37si...@lavabit.com> writes: >> >>> On Sun, Jul 24, 2011 at 02:34:22PM +0800, lolilolicon wrote: >>>> > unset IFS >>>> > >>>> > cmd=$(dmenu "$@" < "$CACHE") && eval exec "$cmd" >>>> Yeah, I see you just hate backticks :P >>>> >>> >>> There is a difference: >>> >>> % echo `echo '\\'` >>> \ >>> % echo $(echo '\\') >>> \\ >> >> That must be a bashism, can't reproduce in dash, mksh, zsh. >> >> -- >> Christian Neukirchen <chneukirc...@gmail.com> http://chneukirchen.org >> >> >> > > The builtin echo may differ from /bin/echo. For example, here in dash: > > $ echo '\\' > \ > $ echo `echo '\\'` > \ > $ echo $(echo '\\') > \ > > $ /bin/echo '\\' > \\ > $ /bin/echo `/bin/echo '\\'` > \ > $ /bin/echo $(/bin/echo '\\') > \\ > > In fact the builtin echo really sucks: > > $ echo \\ > \ > $ echo \\\\ > \ >
Sorry, but please allow me to rephrase the issue. The `echo' builtin in dash by default behaves like `echo -e' in bash. So it's a bit tricky to reproduce the difference in dash: $ echo `echo '\\\\\\\\'` \ $ echo $(echo '\\\\\\\\') \\ Or, just use `printf %s': $ printf '%s\n' `printf '%s\n' '\\'` \ $ printf '%s\n' $(printf '%s\n' '\\') \\ For the record, the sucky `echo' is what POSIX defines: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html And thank you Szabolcs Nagy for pointing me to the lastes spec. Cheers.
