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Date: September 11, 1991 21:45
From: GAWD::SHEPPERD
To: @SYS$MAIL:ENGINEER
CC: SHEPPERD
Announcing an update to the TAIL utility. Now it has a -f option (or /F if you prefer) which lets you monitor the input file. TAIL with the -f option, will display the last n lines (defaults to the pagesize of your terminal) and add new ones as they show up in the input file. It samples the input file once every 5 seconds to see if anything changed. You quit out of TAIL in monitor mode by typing a(or some other terminting character) on you terminal. If you put wildcards on the input filename and select the monitor mode, then typing a return will cause TAIL to advance to the next file. After all files have been displayed, then it'll exit. This feature can be used to do something like TAIL /PAGE where it'll show you the tail of a file and wait for you to type return to see the next one, etc. Typing TAIL with no parameters displays a small help screen. Normally, the job controller updates a batch log file only once every minute or when it's buffers overflow. You can change that with the DCL command SET OUTPUT_RATE=time. I've modified the BATCH and AT procedures to output to the log file once every 5 seconds which will make the BATCH.LOG and ??.LOG files reflect more timely information when using TAIL -F. ds
Sep 11, 1991