Command Reference Guide

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1/!!!intro.1
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d
diff(1) diff(1)
WARNINGS
Editing scripts produced by the -e or -f option are naive about creating lines consisting of a single dot
(.).
When comparing directories with the -b, -w,or -i options specified, diff first compares the files in the
same manner as cmp, then runs the diff algorithm if they are not equal. This may cause a small
amount of spurious output if the files are identical except for insignificant blank strings or
uppercase/lowercase differences.
The default algorithm requires memory allocation of roughly six times the size of the file. If sufficient
memory is not available for handlinglarge files, the -h option or bdiff can be used (see bdiff(1)).
With other options if sufficient memory is not available, then either the swap or maxdsiz values can be
increased.
When run on directories with the -r option, diff recursively descends sub-trees. When comparing deep
multi-level directories, more memory may be required than is currently available on the system. The
amount of memory required depends on the depth of recursion and the size of the files.
AUTHOR
diff was developed by AT&T, the University of California, Berkeley, and HP.
FILES
/usr/lbin/diffh used by -h
option
SEE ALSO
bdiff(1), cmp(1), comm(1), diff3(1), diffmk(1), dircmp(1), ed(1), more(1), nroff(1), rcsdiff(1), sccsdiff(1),
sdiff(1), terminfo(4).
STANDARDS CONFORMANCE
diff: SVID2, SVID3, XPG2, XPG3, XPG4, POSIX.2
Section 1−−180 − 3 − HP-UX Release 11i: December 2000
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