If no switches are used on the command line, inuse produces a table of those rows which are in use at that moment.

-d

(debug). A 3 column table of logical record number, row disposition flag, and row offset is produced on the standard output. When the row is displayed on a user's screen, it is considered to be in use, and the flag field will be -1. If the row has been modified and the overall row length has changed, then flag will be the negative value of the logical row at which the modified version resides. The flag column at the new logical row will be either the original logical row number or 0, if the row is deleted. flag is 0 when the row at that offset has either been deleted or has been modified more than once. As rows are modified or deleted, their contents at the original locations are blanked out, to prevent inaccurate search results.

-v

(verbose). This option causes a single-row table to be produced on the standard output. Information in the row includes the table name; the exact time of execution; the field separation character (in octal representation); whether or not the table has been modified and what the next automatic record number assignment is.

-u

(users). This option produces nothing on the standard output but returns the number of users as its exit status.

$ inuse inventory
Item    Amount  Cost    Value   Description
----    ------  ----    -----   -----------
2       100     5.23    500     test tubes

$ inuse -d inventory
record  flag    offset
------  ----    ------
1       -11     70
2       2       96
3       3       114
4       4       133
5       5       161
6       6       191
7       0       210
8       8       222
9       9       234
10      10      247
11      1       260

$ inuse -v inventory
table      time          fs   mod  users   recno
---------  ------------  ---  ---  -----   -----
inventory  940908154804  011  y    1       12

$ inuse -u inventory
$ echo $?
1