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| Advanced Bash-Scripting Guide: | ||
|---|---|---|
| Prev | Chapter 9. Another Look at Variables | Next |
Process ID of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result.
bash4$ echo $$ 11015 bash4$ echo $BASHPID 11015 bash4$ ps ax | grep bash4 11015 pts/2 R 0:00 bash4 |
#!/bin/bash4 echo "\$\$ outside of subshell = $$" # 9602 echo "\$BASH_SUBSHELL outside of subshell = $BASH_SUBSHELL" # 0 echo "\$BASHPID outside of subshell = $BASHPID" # 9602 echo ( echo "\$\$ inside of subshell = $$" # 9602 echo "\$BASH_SUBSHELL inside of subshell = $BASH_SUBSHELL" # 1 echo "\$BASHPID inside of subshell = $BASHPID" ) # 9603 # Note that $$ returns PID of parent process. |
An environmental variable pointing to a Bash startup file to be read when a script is invoked
A variable indicating the subshell level. This is a new addition to Bash, version 3.
See Example 21-1 for usage.
A 6-element array containing version information about the installed release of Bash. This is similar to $BASH_VERSION, below, but a bit more detailed.
# Bash version info:
for n in 0 1 2 3 4 5
do
echo "BASH_VERSINFO[$n] = ${BASH_VERSINFO[$n]}"
done
# BASH_VERSINFO[0] = 3 # Major version no.
# BASH_VERSINFO[1] = 00 # Minor version no.
# BASH_VERSINFO[2] = 14 # Patch level.
# BASH_VERSINFO[3] = 1 # Build version.
# BASH_VERSINFO[4] = release # Release status.
# BASH_VERSINFO[5] = i386-redhat-linux-gnu # Architecture
# (same as $MACHTYPE).
|
$BASH_VERSION
The version of Bash installed on the system
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