different between diff vs iff

English

Pronunciation

• IPA^(key): /d?f/
• Rhymes: -?f

Noun

diff (plural diffs)

1. (slang) Abbreviation of difference.

   A peach and an apricot? What's the diff?

2. (computing) Any program which compares two files or sets of files and outputs a description of the differences between them.
3. (computing) The output of a diff program. A diff file.
   • 2004, Paul Graham, Great Hackers, Essay:

     I didn't want to waste people's time telling them things they already knew. It's more efficient just to give them the diffs.

4. (medicine) Abbreviation of differential: differential of types of white blood cell in a complete blood count.
5. (rock climbing) A difficult route.

Verb

diff (third-person singular simple present diffs, present participle diffing, simple past and past participle diffed)

1. (transitive, computing) To run a diff program on (files or items) so as to produce a description of the differences between them, as for a patch file.
2. (transitive, computing) To compare two files or other objects, manually or otherwise.

Proper noun

diff

1. (computing) A program, historically part of the Unix operating system, which compares two files or sets of files and outputs a description of the differences between them.

Related terms

• (computing) diff file

See also

• (computing) patch

English

Pronunciation

• Read as “if and only if”

Conjunction

iff

1. (mathematics, logic) If and only if; used to show that the truth values of two statements are the same.
2. (mathematics, logic) logically equivalent to rephrases:

   A rectangle is a square iff all four of its sides have the same length.

   1. biconditionally
   2. just in case or just in the case that
   3. equal
   4. that is to say
   5. XNOR
3. Obsolete spelling of if.

Related terms

• if
• implies
• not
• and
• or
• xor
• nand
• nor

See also

• formal logic

Translations

Anagrams

• FFI, FIF, Fif.