Re: extra slash in current path
俞颐超 <[email protected]> Thu, 23 Jun 2011 11:02:26 -0400
| Newsgroups | org.kernel.vger.linux-c-programming,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
On Thu, Jun 23, 2011 at 10:52 AM, Lars Täuber <[email protected]> wrote: > Am Thu, 23 Jun 2011 18:31:06 +0400 > Michael Tokarev <[email protected]> schrieb: >> 23.06.2011 18:11, yuyichao-mit wrote: >> >> >>>> $ cd // >> >>>> $ pwd >> >>>> // >> >> The current directory is cached in $PWD environment >> variable by shell (bash at least). This variable is >> checked in glibc (getcwd() et al) - if it is set and >> stat($PWD) is the same as stat("."), that value is used. > > It also is somehow cached inside bash/dash for it's built in commands. > $ cd // > $ export PWD=5 this PWD=5 is not necessary. > $ pwd > // > $ /bin/pwd > / $ export PWD=//// $ /bin/pwd / $ pwd // $ echo $PWD //// $ a.out (simply output get_current_dir_name()) //// so getcwd indeed use $PWD (for symlink?) but pwd and /bin/pwd both simplify the output although bash simplify it in a strange way~~~ ~~interesting > > > Regards > Lars > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >