src/usr.bin/m4/m4.1 - diff

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version 1.65, 2021/03/08 02:47:28

version 1.66, 2022/03/31 17:27:25

Line 74

parenthesis

.Pq Sq \&( .

If the macro name is not followed by an open

parenthesis it is processed with no arguments.

parenthesis, it is processed with no arguments.

.Pp

Macro names consist of a leading alphabetic or underscore

possibly followed by alphanumeric or underscore characters, e.g.,

Line 332

.Ic index(the quick brown fox jumped, fox)

returns 16).

If the second

argument is not found index returns \-1.

argument is not found, index returns \-1.

.It Fn indir macro arg1 ...

Indirectly calls the macro whose name is passed as the first argument,

with the remaining arguments passed as first, ... arguments.

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.It Fn substr string offset length

Returns a substring of the first argument starting at the offset specified

by the second argument and the length specified by the third argument.

If no third argument is present it returns the rest of the string.

If no third argument is present, it returns the rest of the string.

.It Fn syscmd cmd

Passes the first argument to the shell.

Nothing is returned.