Lookup a user or group info via user uid/name or group gid/name.
user_info(uid = getuid())group_info(gid = getgid())
group_info(gid = getgid())
user ID (integer) or name (string)
group ID (integer) or name (string)
GETPWNAM(3) GETGRNAM(3)
# NOT RUN { # Get info current user user_info() group_info() # }
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