<operating system> 1. An undigested and voluminous mass of information about a problem or the state of a system, especially one routed to the slowest available output device (compare core dump), and most especially one consisting of hexadecimal or octal runes describing the byte-by-byte state of memory, mass storage, or some file.

In elder days, debugging was generally done by "groveling over" a dump (see grovel); increasing use of high-level languages and interactive debuggers has made such tedium uncommon, and the term "dump" now has a faintly archaic flavour.

2. A backup.

This usage is typical only at large time-sharing installations.

Unix manual page: dump(1).

[Jargon File]

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Dual Tone Multi Frequency
Duff's device
dumbed down
dumb terminal
backup software
Berkeley Quality Software
brain dump
dumpster diving
dup killer
Duplex High Speed Data