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Invokes a shell to run <external-command> from within FreeM. This temporarily disables SIGALRM handling in FreeM, which may interrupt the use of event-driven M programming commands including ESTART and ESTOP.
If the < character is supplied immediately preceding <external-command>, FreeM will append the contents of M local variable % to <external-command> as standard input.
If the > character is supplied immediately preceding <external-command>, FreeM will take the standard output stream of <external-command> and store it in M local variable %.
% contains the number of lines in the input or output. %(1)..%(n) contains the data for lines 1-n.
This document was generated by John P. Willis on August 12, 2021 using texi2html 1.82.