Figure 1: Finding users

#
# fuser
#
# The first command displays the process numbers of the
# processes using the file "/opt/lib/data1". The second
# command shows more information on the running processes.

bellona:~ 203% fuser -u /opt/lib/data1
/opt/bin/tcsh:  13396t(shelly)  11012t(lynn)  10055t(joe)

bellona:~ 204% ps -ef | egrep  -e '13396 | 11012 | 10055'
lynn     11012 10986 80 12:05:56 pts/6    0:01 pgm1
joe      10055 10035 80 10:08:28 pts/5    0:02 pgm2
shelly   13396 13394 74 16:48:49 pts/4    0:01 pgm3