Controlling The Files In The Library - IBM 5110 User Manual

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CONTROLLING THE FILES IN THE LIBRARY
Once you have stored several workspace and data files on a tape or
diskette (your library), you might want to know what files you have in
your library. You can use the )LlB command to display the file headers
for a specified tape or diskette. The file headers provide you with
such information as the file number, the file ID, the file type, and so
on. See The )L18 Command in the IBM 5110 APL Reference Manual,
SA21-9303, for a description of the information contained in the file
header.
When there are files on tape or diskette that contain data that is no
longer required, you can mark these files unused by issuing the )DROP
command. Once a file is marked unused, any data in the file can no
longer be read into the 5110 and the file is available for other uses.
Also, if a diskette file is no longer required, you can make the file
space available for reallocation by issuing the )FREE command. This
allows the file space on the diskette to be used for other numbered
files by the )MARK command. See Diskette Concepts for more
information on how files are allocated on a diskette.