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Old 08-20-2007
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radoulov radoulov is offline
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Join Date: Jan 2007
Location: Milano, Italia/Варна, България
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Code:
$ who
oracle     pts/1        Aug 21 04:57    (...)
oracle     pts/4        Aug 21 04:57    (...)
$ who|awk '!x[$1]++'
oracle     pts/1        Aug 21 04:57    (...)

If you want only the first field to be displayed:

Code:
who|awk '!x[$1]++{print $1}'

Use nawk on Solaris.
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