internal field separators

<operating system>

($IFS) A predefined environment variable in the Unix Bourne shell whose default value is the three-character string containing space, tab and line feed. Any string of one or more of these characters separates the command and each of its arguments in a command line.

$IFS also tells the shell's built-in read command where to split an input line when reading into multiple variables. E.g. setting IFS=: would be appropriate for reading a file with ':'-separated fields, such as /etc/passwd.

Last updated: 1999-04-07

Internal Translator

<language, mathematics>

(IT) An early compiler for mathematics developed by A.J. Perlis et al at Carnegie Tech ca 1957. IT was originally written for the Burroughs 205, then the IBM 650.

IT was the forerunner of RUNCIBLE, GATE, CORRELATE and GAT. IT source code was converted to PIT, thence to SPIT.

IT-2 produced machine language directly, IT-3 developed at Carnegie added double-precision floating-point.

[Sammet 1969, pp. 139-141].

[CACM 1(5):22 1958].

Last updated: 1994-11-30

Nearby terms:

intermodulation distortioninternal field separatorsInternal Translator

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