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Useful use of cat(1)
Rather special example: This was useful for me on a Redhat Linux, where man(1) otherwise annoyingly would intersperse the output with headers and footers for a print version, which is rarely used, though... I tried: ( echo -e ".pl 1100i"; cat "$1"; echo ".pl \\n(nlu+10\n" ) | tbl | nroff -man