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PX(1) General Commands Manual PX(1)

px — Pascal interpreter

px [obj [argument ...]]

Px interprets the abstract machine code generated by pi(1). The first argument is the file to be interpreted, and defaults to obj; remaining arguments are available to the Pascal program using the built-ins argv and argc. Px is also invoked by pix when running `load and go'.

If the program terminates abnormally an error message and a control flow backtrace are printed. The number of statements executed and total execution time are printed after normal termination. The p option of pi suppresses all of this except the message indicating the cause of abnormal termination.

obj
default object file
pmon.out
profile data file

pi(1), pix(1)

Berkeley Pascal User's Manual.

Most run-time error messages are self-explanatory. Some of the more unusual ones are:

Reference to an inactive file
A file other than input or output was used before a call to reset or rewrite.
Statement count limit exceeded
The limit of 500,000 executed statements (which prevents excessive looping or recursion) has been exceeded.
Bad data found on integer read
 
Bad data found on real read
Usually, non-numeric input was found for a number. For reals, Pascal requires digits before and after the decimal point so that numbers like `.1' or `21.' evoke the second diagnostic.
panic:
Indicates an internal inconsistency detected in px probably due to a Pascal system bug.

The Px comman appeared in 3.0BSD.

Post-mortem traceback is not limited; infinite recursion leads to almost infinite traceback.

BSD 3 August 7, 1991 PX(1)