On Friday, April 5, 2002, at 09:29 , Aman Raheja wrote:
> Hi All
> Why can't I move to the parent directory using
> system "cd ..";
> Actually cd command doesn't work at all with system !!! why ?
note: 'system' invokes a 'sub shell' - and that
sub shell changed directories - while the calling
code stayed put.
> Though I can do so by
> chdir("..");
this does not occur in a sub shell - but in the
code itself.
> Is there a way to physically move to another dir, for eg.
> [aman@aman /usr/home/aman]$./pdir.pl
> [aman@aman /usr/home]$
remember the command that you invoke here is running
in a sub shell of the login 'command line' shell ...
eg: [ /usr/home/bob ]$ cd ..
[ /usr/home/ ]$
whereas invoking it in a sub shell ala
[jeeves:~] drieux% /bin/sh -c 'cd .. ; pwd'
/home
[jeeves:~] drieux% pwd
/Users/drieux
[jeeves:~] drieux%
moves the sub_shell, but not the login shell.
What you appear to want is something that 'execs' over the current login
shell
[jeeves:~] drieux% exec /bin/sh -c 'cd .. ; pwd ; sh'
/home
jeeves% pwd
/home
jeeves%
So try to remember if YOU are moving or your code.
ciao
drieux
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