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FreeBSD 11.0 - man page for grog (freebsd section 1)

GROG(1) 						      General Commands Manual							   GROG(1)

grog - guess options for groff command
grog [ -option ... ] [ files ... ]
grog reads files and guesses which of the groff(1) options -e, -man, -me, -mm, -mom, -ms, -mdoc, -mdoc-old, -p, -R, -g, -G, -s, and -t are required for printing files, and prints the groff command including those options on the standard output. A filename of - is taken to refer to the standard input. If no files are specified the standard input will be read. Any specified options will be included in the printed command. No space is allowed between options and their arguments. The only options recognized are -C (which is also passed on) to enable compatibility mode, and -v to print the version number. For example, `grog -Tdvi` will guess the appropriate command to print and then run it after adding the -Tdvi option.
doctype(1), groff(1), troff(1), tbl(1), pic(1), eqn(1), refer(1), grn(1), grap(1), soelim(1) Groff Version 1.19.2 23 March 2013 GROG(1)