Related:

• idempotent adj. [from mathematical techspeak] Acting as if used only once, even if used multiple times.
  This term is often used with respect to C header files, which contain common definitions and declarations to be included by several source files....
• opic drift n. Term used on GEnie, Usenet and other electronic fora to describe the tendency of a thread to drift away from the original subject of discussion (and thu
  from the Subject header of the originating message), or the results of that tendency....
• link farm: [UNIX] n. A directory tree that contains many links to files in a master directory tree of files.
  Link farms save space when one is maintaining several nearly identical copies of the same source tree --- for example, when the only difference is architecture-dependent object files....
• diff: /dif/ n. 1. A change listing, especially giving differences between (and additions to) source code or documents (the term is often used in the plural `diffs').
  Send me your diffs for the Jargon File!" Compare {vdiff}....
• magic number n. [Unix/C; common] 1. In source code
  some non-obvious constant whose value is significant to the operation of a program and that is inserted inconspicuously in-line (hardcoded), rather than expanded in by a symbol set by a commented #define....
• foo /foo/ 1. interj. Term of disgust. 2. [very common] Used very generally as a sample name for absolutely anything, esp.
  programs and files (esp. scratch files). 3. First on the standard list of metasyntactic variables used in syntax examples....
• wallpaper: n. 1. A file containing a listing (e.g., assembly listing) or a transcript, esp.
  a file containing a transcript of all or part of a login session....
• link farm n. [Unix] A directory tree that contains many links to files in a master directory tree of files.
  Link farms save space when one is maintaining several nearly identical copies of the same source tree -- for example, when the only difference is architecture-dependent object files....
• diff /dif/ n. 1. A change listing, especially giving differences between (and additions to) source code or documents (the term is often used in the plural `diffs').
  Send me your diffs for the Jargon File!" Compare vdiff....