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Top Forums Shell Programming and Scripting What is the meaning of file name ending with .$$? Post 302977744 by Scrutinizer on Thursday 21st of July 2016 04:35:08 PM
Old 07-21-2016
Hi, $$ is a variable that contains the process id of the shell. It is used in tmp directories, to make it less likely that one process interferes with a temporary file of another process and that the temporary files do not share the same name.

from the man page:
Code:
$$: Expands to the process ID of the shell.  In a () subshell, it expands  to  the process ID of the current shell, not the subshell.


Last edited by Scrutinizer; 07-21-2016 at 05:52 PM..
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CDBS-EDIT-PATCH(1)						CDBS Documentation						CDBS-EDIT-PATCH(1)

NAME
cdbs-edit-patch - create or edit a CDBS simple-patchsys.mk patch SYNOPSIS
cdbs-edit-patch patchname DESCRIPTION
cdbs-edit-patch creates or edits patches for use by the CDBS simple-patchsys.mk patch system. For more information about CDBS please see the documentation under /usr/share/doc/cdbs/. When patchname exists, cdbs-edit-patch will set up a temporary working source tree, apply all patches up to and including patchname in lex- icographic order, and spawn an interactive shell for the developer. The developer can then edit files in this working tree. When the developer is done and exits the shell, cdbs-edit-patch updates patchname to reflect the changes made. To abort the process from the inter- active shell, exit with a nonzero exit value. When patchname does not exist, cdbs-edit-patch will assume that a new patch should be created. As with the above scenario, cdbs-edit-patch will first create a temporary working source tree and apply all patches up to the new patch in lexicographic order. When the shell is quit, cdbs-edit-patch will create patchname. AUTHOR
CDBS was written by Colin Walters and others. cdbs-edit-patch was written by Martin Pitt. This manual page was written by Peter Eisen- traut based on the dpatch-edit-patch(1) manual page. SEE ALSO
CDBS documentation in /usr/share/doc/cdbs/, /usr/share/cdbs/1/rules/simple-patchsys.mk, dpatch-edit-patch(1), quilt(1) Debian 5 Feb 2006 CDBS-EDIT-PATCH(1)
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