diff¶

compare two files line by line
NAME
    diff - compare two files line by line

SYNOPSIS
    diff old new

DESCRIPTION
    Compares two files. It skips the common leading and trailing lines
    and reports the differing middle: lines only in the first file are
    prefixed "< ", lines only in the second "> ". Identical files produce
    no output. This is a prefix/suffix-anchored diff that isolates one
    changed block, not a minimal-edit diff. Holds up to 96 lines of 79
    chars per file. diff is a /bin program.

EXAMPLES
    diff OLD.TXT NEW.TXT
    diff a.asm b.asm

SEE ALSO
    cat, grep