# Current User:
getuid()
# Current UserGroup:
getgid()
# Current UserGroup:
geteuid()
# Current UserGroup:
getegid()
# Process ID
getpid()
# parent PID:
getppid()
# Process group id:
getpgid()
# Detach process group
setpgid(0)
getpgid()
# Process priority:
getpriority()
# Decrease priority
setpriority(getpriority() + 1)
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