FC

Supported DOS versions:	All versions
How easy to use?	Moderate
How safe to use?	Very safe
How common?	Fairly common
Internal or external command?	External

Compares two files or sets of files and displays differences between them.

FC [/a] [/c] [/l] [/lbn] [/n] [/t] [/w] [/nnnn] file1 file2

FC [/b] file1 file2

/a displays only the first and last lines of each set of differences
/b performs a binary comparison and displays bytes as hexadecimal numbers. This applies to EXE, COM, SYS, OBJ, LIB and BIN files automatically. Only the /nnnn switch works with this option.
/c ignores case of characters (that is, "a" is the same as "A")
/l compares the files line by line (in ASCII mode).
/lbn sets the number of consecutive mismatches in the difference report to the number of lines specified by the n parameter (the default is 100 lines)
/n displays line numbers
/t treats tab characters as tab characters instead of eight spaces.
/w ignores leading spaces and tabs, and treats other spaces and tabs as single spaces
/nnnn specifies the number of consecutive lines that must match after a mismatch (the default is two)

FC replaces COMP for comparing files.