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-   -   Create file using 'touch ./tmp.$$', file tmp.3941 is created, why? (http://www.linuxquestions.org/questions/linux-general-1/create-file-using-touch-tmp-%24%24-file-tmp-3941-is-created-why-169449/)

huangyanfeng 04-13-2004 03:09 AM

Create file using 'touch ./tmp.$$', file tmp.3941 is created, why?
 
Create file using 'touch ./tmp.$$', file tmp.3941 is created, why?

Tinkster 04-13-2004 03:36 AM

Because $$ is a bash-variable, it hold the PID of
the process invoking it, in other words, the pid of
the shell you used to touch. It will vary in other
shells ;)


Cheers,
Tink


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