Create directory by mkdir

I want to create a folder named by the user name in 开发者_StackOverflow中文版/tmp/vnc/, I can create that folder in command line with perl -e 'mkdir("$ENV{USER}")', but for the following code cannot work.

chdir ("/tmp/vnc") or die -1;
mkdir ("$ENV{USER}", 0777) or die -1;

If I use mkdir -p /tmp/vnc/$ENV{USER} in command line to make folder, nothing happens and no error reports.

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It works for me. Maybe the /tmp/vnc directory does not exist, and the chdir fails. Or maybe the $USER environment variable is not defined, because you are running it from a init.d script, for example... Or maybe you do not have write permissions in the /tmp/vnc directory. Have you tried executing mkdir /tmp/vnc/$USER from the shell?

Impossible to know more without details.

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1. Please check special variable $! for text error message
2. Please check that variable $ENV{USER} doesn't contain extra quotes. I had similar problem in Windows OS for Activer Perl. My problem was in extra quotes

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Perhaps something is resetting your environment when you are running the script? Can you print the contents of $ENV{USER} and make sure it contains what you think it should?

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if $ENV{USR} is an absolute path (with the leading slash), then the chdir is useless since you are not using a relative path