Hi I stumbled upon the same file size limitation of "look" today (incidentally, doing a similar thing as Stephane).
I believe the bug in the file size check can be fixed by patching the Makefile so that the correct define is used. SIZE_MAX was introduced in C99 for this purpose: --- a/usr.bin/look/Makefile 2017-12-29 10:02:09.000000000 +0100 +++ b/usr.bin/look/Makefile 2018-10-06 17:36:49.010093578 +0200 @@ -1,6 +1,6 @@ PROG = look LIBS += -lbsd -FLAGS = -include bsd/err.h -DSIZE_T_MAX=INT_MAX +FLAGS = -include bsd/err.h -DSIZE_T_MAX=SIZE_MAX topdir=../.. include $(topdir)/config.mk After a quick look at the code I couldn't find any problems with that. All relevant variables indeed seem to be using size_t, not int. "look" from bsdmainutils 11.1.2 with this patch applied on Debian Stretch seems to work as expected on a file roughly 22 GiB in size. It will correctly find lines at the start as well as at the end of the file. Best regards Tomaž
