How can I get ps to print %MEM and %CPU?

Prior to Solaris 2.4, the OS didn't do the bookkeeping
necessary to obtain these values. In Solaris 2.4 the code
was added to kernel and /usr/ucb/ps can now show these values.

Under Solaris 2.3 and earlier your only recourse is using
the public domain utility top (See 2.4).
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