Re: How to change path

This snippet

$pwd=`pwd`;
print "\n pwd is $pwd";
`cd /usr/bin`;
$pwd=`pwd`;
print "\n pwd is $pwd\n";
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is not changing the dir "/usr/bin" , I reason I suppose is if we execute a command directly using back-ticks(`) it will execute in a new shell.But system() will execute the commands in same shell.Am I right??

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Comment on Re: How to change path Download Code

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Re^2: How to change path by snowhare (Friar) on Oct 25, 2007 at 11:16 UTC
No. You're not right. 'system' forks a new process to execute the requested command. 'exec' would execute the command in the same process, but that would have the effect of _ending_ the Perl program to launch the new one (IOW, the program would never 'return' to the Perl program because it would _replace_ it). As someone else said, to do what the OP appears to want to do, they should use the Perl function 'chdir'.	[reply]

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Re^2: How to change path
by snowhare (Friar) on Oct 25, 2007 at 11:16 UTC

No. You're not right. 'system' forks a *new* process to execute the requested command. 'exec' would execute the command in the same process, but that would have the effect of _ending_ the Perl program to launch the new one (IOW, the program would never 'return' to the Perl program because it would _replace_ it). As someone else said, to do what the OP appears to want to do, they should use the Perl function 'chdir'.

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