MPE CI Programming for 7.5

July 22, 2008
Page 10
hp e3000
strategy
UDCs vs. scripts (cont.)
• maintenance / flexibility / security
• SETCATALOG opens UDC file, cannot edit without un-cataloging file, but
difficult to accidentally purge UDC file
• UDC commands grouped together in same file, easier to view and
organize
• UDC file can be lockword protected but users don’t need to know
lockword to execute a UDC
• scripts opened while being executed (no cataloging), can be purged and
edited more easily than UDCs
• scripts can live anywhere on system. Convention is to place general
scripts in a common location that grants read or eXecute access to all,
e.g. “XEQ.SYS” group
• if script protected by lockword then it must be supplied each time the
script is executed