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4.3. COMMANDS 113

casech FROM/A,TO/A,DICT/K,U/S,L/S,A/S CIN:y, POS:y, NAT:y

This command systematically converts all reserved words of a BCPL program to

upper case and changing all identiﬁers to upper case (U), lower case (L, or in the form

given by a speciﬁed dicti onar y (DICT). The A switch causes all letters i nc l udi n g those

in strings to be converted to upper case.

changepri TASK/N/A,PRI=PRIORITY/N CIN:n, POS:y, NAT:n

This Cintpos command changes the priority of the speciﬁed task to a speciﬁed

value. If two arguments are given the ﬁrst identiﬁes the task and the second the new

priority. If on l y one argument is given it is treated as t he new priority of the current

task. A Cintpos priority can be any positive integer but there is the restiction that no

two tasks can have the same priority.

checksum FROM/A,TO/K CIN:y, POS:y, NAT:y

This command calculates a check sum for the ﬁle speciﬁed by the FROM argument,

sending the result to the ﬁle speci ﬁe d by the TO argument.

cmpltest CIN:y, POS:y, NAT:y

This is a t e st program that checks for errors in the BCPL compiler and Cintcode

interpreter.

cobench CIN:y, POS:y, NAT:y

This is a benchmark program to test the eﬃciency of coroutines.

cobounce CIN:y, POS:y, NAT:y

This is a simple coroutine benchmark that bounces a message between two corou-

tines.

compare FILE1/A,FILE2/A,TO/K,OPT/K CIN:y, POS:y, NAT:y

This command compares two ﬁles outputting a description of how they diﬀer to the

TO ﬁle if speciﬁed, or to st andar d output if not. The OPT str i n g consists of items of the

form Wn, Mn and Rn, separated by spaces or commas. Each n is a number greater than

zero. Wn means truncate all input lines to no more than n characters. Mn search for up

to n mismatching lines. Rn means that n lines must match before synchronisation is

restored after a mismatch.

cosim -n/n,-s/n,-p/n,-r/n,-t/s CIN:y, POS : y, NAT:y

This is a demonstration program showing how to write a discrete event simulator

using coroutines, and it is also be used as a benchmark. Its arguments can set the

variables n, s, p and r that conﬁgure the test, and the -t switch turns on ru n time

tracing to check that the simulator is behaving correctly. For a full description and

listing of this program see Section 3.7.3.

dat CIN:y, POS:y, NAT:y

This commands output the current dat e and time to the TO ﬁle, if speciﬁed, other-