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BASHPID

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Process ID (pid) of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result. This is new in Bash 4 and doesn’t work in Bash 3. 

~> $ echo "\$\$ pid = $$  BASHPID = $BASHPID"
$$ pid = 9265  BASHPID = 9265
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Internal variables:
* Internal variables
* Bash internal variables at a glance
*
*
* HOME
* etc...
*
* FUNCNAME
*
*
* PWD
* HISTSIZE
* IFS
*
* OLDPWD
* PATH
* OSTYPE
* MACHTYPE
* PPID
* HOSTTYPE
* SECONDS
* SHELLOPTS
* HOSTNAME
* EDITOR
* BASH VERSION
* BASH VERSINFO
* BASH ENV
* BASHPID
*
* RANDOM
* SHLVL
* LINENO
* GROUPS
* UID
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