08-13-2014
What's the exact contents of each file?
Right now, you're literally running millions of greps, comparing each ID to every other ID. That's a huge waste of time, obviously. You only really need to compare each ID to itself.
Because it seems to me that you're just looking for IDs that are in both files. If each ID only occurs once in each file, pull the IDs out of each file, combine them into one file, sort them, and only count IDs that are duplicated in the combined file.
Or you can figure out how to use the "join" utility, though that may not be any faster than what you're already doing, although it does have the huge advantage of not having to fork() and exec() a new process millions of times.
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LEARN ABOUT HPUX
setregid
setregid(2) System Calls Manual setregid(2)
NAME
setregid - sets the real and effective group IDs
SYNOPSIS
DESCRIPTION
sets the real and effective group IDs of the calling process.
Only a privileged process can set the real group ID and/or the effective group ID to any valid value. A nonprivileged process can set the
real group ID to the saved set-group-ID from one of the exec family of functions, or the effective group ID to either the saved set-group-
ID or the real group ID.
Any supplementary group IDs of the calling process remain unchanged.
Argument rgid is the read group ID value to be set with. If rgid is set to the real group ID is not be changed.
Argument egid is the effective group ID value to be set with. If egid is set to -1, the effective group ID is not changed.
The real and effective group IDs may be set to different values in the same call.
Security Restrictions
Some or all of the actions associated with this system call require the privilege (CHSUBJIDENT). Processes owned by the superuser will
have this privilege. Processes owned by other users may have this privilege, depending on system configuration.
See privileges(5) for more information about privileged access on systems that support fine-grained privileges.
RETURN VALUE
Upon successful completion is set to Otherwise, errno is set to indicate the type of error and neither group IDs are changed.
ERRORS
is set to one of the following values if the corresponding condition is detected.
The value of the
rgid or egid argument is invalid or out-of-range.
The process does NOT have all the appropriate privileges other
than to change the real group ID to the saved set-group-ID, or to change the effective group ID to either the real group ID
or the saved set-group-ID.
AUTHOR
was developed by the University of California, Berkeley and HP.
SEE ALSO
exec(2), geteuid(2), getgid(2), getuid(2), setegid(2), setgid(2), setreuid(2), setuid(2).
setregid(2)