其中f1 是表示分钟，f2 表示小时，f3 表示一个月份中的第几日，f4 表示月份，f5 表示一个星期中的第几天。program 表示要执行的程序。
当 f1 为 * 时表示每分钟都要执行 program，f2 为 * 时表示每小时都要执行程序，其馀类推
当 f1 为 a-b 时表示从第 a 分钟到第 b 分钟这段时间内要执行，f2 为 a-b 时表示从第 a 到第 b 小时都要执行，其馀类推
当 f1 为 */n 时表示每 n 分钟个时间间隔执行一次，f2 为 */n 表示每 n 小时个时间间隔执行一次，其馀类推
当 f1 为 a, b, c,... 时表示第 a, b, c,... 分钟要执行，f2 为 a, b, c,... 时表示第 a, b, c...个小时要执行，其馀类推
-F <filename> same as -f but user supplied filename
-c <number> number of snapshots
-d requests disk service and wait times (DISKSERV and DISKWAIT)
-i <percent> Ignore processes using less than this amount of CPU when generating TOP section – useful for reducing data volumes
-g <filename> file containing disk group definitions
-l <dpl> number of hdisks per sheet - defaults to 150, maximum 250. See notes
-m <dir> NMON changes to this directory before saving the file
-r <runname> goes into spreadsheet file [default hostname]
-s <seconds> interval between snap shots
-x capacity planning (15 mins for 1 day = -fdt -s900 -c96)
-t include top processes in the output
-T as –t plus saves command line arguments in UARG section
-A include data for async I/O (PROCAIO) sections
-D prevents DISK sections being produced (useful when Disk Groups are being used because there are too many hdisks to process)
-E stops ESS sections being produced (necessary when Disk Groups are being used because there are too many vpaths to process)
-J prevents JFS sections being produced (prevents Excel errors when you have more than 255 filesystems)
-L includes LARGEPAGE section
-N include NFS sections
-S include WLM sections with subclasses
-W include WLM sections without subclasses
-Y include SUMMARY section (very efficient alternative to –t if PID level data is not required)