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Full Discussion: $$ value changes often
Top Forums UNIX for Dummies Questions & Answers $$ value changes often Post 302659481 by Scrutinizer on Thursday 21st of June 2012 03:41:19 AM
Old 06-21-2012
Notice that 4100348 does not change, as this is your current shell. The other numbers are the PID or the various perl interpreter processes that get started..
 
KILL(1) 							   User Commands							   KILL(1)

NAME
kill - send signals to processes, or list signals SYNOPSIS
kill [-s SIGNAL | -SIGNAL] PID... kill -l [SIGNAL]... kill -t [SIGNAL]... DESCRIPTION
Send signals to processes, or list signals. Mandatory arguments to long options are mandatory for short options too. -s, --signal=SIGNAL, -SIGNAL specify the name or number of the signal to be sent -l, --list list signal names, or convert signal names to/from numbers -t, --table print a table of signal information --help display this help and exit --version output version information and exit SIGNAL may be a signal name like `HUP', or a signal number like `1', or the exit status of a process terminated by a signal. PID is an integer; if negative it identifies a process group. NOTE: your shell may have its own version of kill, which usually supersedes the version described here. Please refer to your shell's docu- mentation for details about the options it supports. AUTHOR
Written by Paul Eggert. REPORTING BUGS
Report kill bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
kill(2) The full documentation for kill is maintained as a Texinfo manual. If the info and kill programs are properly installed at your site, the command info coreutils 'kill invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 KILL(1)
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