Here is a neat one !

     mtlib

     Usage: mtlib -[acdfiklmnqstvCDV?]
     Arguments: -f[filename]   device special Filename, i.e. "/dev/rmt0".
                -x[number]     device number, i.e. "518350".
                -l[filename]   Library special filename, i.e. "/dev/lmcp0".
                -q[type]       Query library information option.
                               type should be one of the following:
                                    V  Volume data.
                                    L  Library data.
                                    S  Statistical data.
                                    I  Inventory data.
                                    C  Category inventory data.
                                    D  Device data.
                                    E  Expanded volume data.
                                    K  inventory volume count data.
                                    R  Reserved Category List
                                    A  Category Attribute List
                                    M  All Mounted Volumes
                -m             Mount option.
                -d             Demount option.
                -D             List of devices in library.
                -c[request id] Cancel pending request option.
                -i[request id] Query request id status option.
                -C             Change the category of a volume.
                -a             Audit the specifed volume.
                -k[flags]      Assign a category to a device in the Library.
                               flags should be the following:
                                    O  Enable Category Order
                                    C  Clear out ICL
                                    G  Generate First Mount
                                    A  Enable Auto Mount
                                    X  Remove category assignment from drive
                                    Valid combinations: OG, OA, GA, OGA
                               Loader associated with the Library.
                -r             Reserve a category
                -R             Release a category
                -S             Set category attribute
                -s[category]   Source or starting category.
                -t[category]   Target category.
                -L[list]       List of Volume serial numbers
                -V[volser]     Volume serial number
                -N[name]       Category Name Attribute to assign to category.
                -h[hostid]     host id for reserve/release category
                               or R/A option for query command
                -#[number]     Category sequence number or number of
                               categories to reserve.
                -?             this help text.

     NOTE:   The  -l argument is required.