whoami - display the effective current username
whoami displays the login name corresponding to the current effective
user ID. If you have used su to temporarily adopt another user, whoami
will report the login name associated with that user ID. whoami gets its
information from the geteuid and getpwuid library routines (see getuid
and getpwent, respectively).
/etc/passwd username data base
su(1), who(1), getuid(2), getpwent(3)
The whoami command provided in versions of IRIX prior to 5.0 was a
symbolic link to /usr/bin/id(1).
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