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From: Beej Jorgensen on 6 May 2008 17:20 Man-wai Chang ToDie (33.6k) <toylet.toylet(a)gmail.com> wrote: >I meant... the cd command itself converts the dir name into inode >number internally, right? I would be surprised if it's not.... Very internally. inodes are quite deep down, and cd really doesn't have to know about them. Each process has a current working directory, which can be obtained from a call to getcwd(). This includes the bash shell, or whatever shell you're running. It changes its working directory by calling the system call chdir() when you issue a "cd" command. As such, cd isn't a program: $ which cd which: no cd in ( ... ) and it makes no sense to have it be a program. Because if the shell ran the external "cd" program, and cd changed its working directory, the shell's working directory would remain unchanged. So what happens is (basically with glossy details): 1. You type "cd foo" 2. The shell executes chdir("foo") 3. The system call chdir() runs the internal namei algorithm to convert the path to an inode. 4. chdir() sets this process's current working directory to namei's result. In bash, you can type "help cd" or "man bash" for the options, since it's an internal bash command. I'd expect the options to widely vary from shell to shell. $ help cd cd: cd [-L|-P] [dir] %cd -h Usage: cd [-plvn][-|<dir>]. -Beej
From: Bit Twister on 6 May 2008 08:36 On Tue, 06 May 2008 20:20:45 +0800, Man-wai Chang ToDie (33.6k) wrote: > > Oh no... where are cd' options? Install a distributions which has man pages. :) http://man.he.net/ http://www.win.tue.nl/~aeb/linux/man/ http://www.freebsd.org/cgi/man.cgi http://netbsd.gw.com/cgi-bin/man-cgi http://www.openbsd.org/cgi-bin/man.cgi
From: pk on 6 May 2008 08:38 On Tuesday 6 May 2008 14:36, Bit Twister wrote: > On Tue, 06 May 2008 20:20:45 +0800, Man-wai Chang ToDie (33.6k) wrote: >> >> Oh no... where are cd' options? > > Install a distributions which has man pages. :) If he's using bash, then the options are in man bash, since cd is builtin in bash. However, my system does have a proper man page for cd too.
From: Man-wai Chang ToDie (33.6k) on 6 May 2008 09:50 > If he's using bash, then the options are in man bash, since cd is builtin in > bash. However, my system does have a proper man page for cd too. Saw.... -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (Xubuntu 7.10) Linux 2.6.25.1 ^ ^ 21:49:01 up 3 days 2:14 3 users load average: 2.16 2.20 2.13 �� �� (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa/
From: Man-wai Chang ToDie (33.6k) on 6 May 2008 09:51
> If he's using bash, then the options are in man bash, since cd is builtin in > bash. However, my system does have a proper man page for cd too. How could I cd into a folder using its inode number? -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (Xubuntu 7.10) Linux 2.6.25.1 ^ ^ 21:50:01 up 3 days 2:15 2 users load average: 2.06 2.16 2.12 �� �� (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa/ |