Real UID: $<
Effective UID: $>
Real GID: $(
Effective GID: $)
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In addition, you can find the associated name using getgrgid()/getpwuid(). Also look at the related functions under the same perlfunc section.
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Fetching user and group info
"endgrent", "endhostent", "endnetent", "endpwent", "getgrent",
"getgrgid", "getgrnam", "getlogin", "getpwent", "getpwnam", "getp-
wuid", "setgrent", "setpwent"
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