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UNIX in a Nutshell: System V Edition

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UNIX Commands
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dc

dc [file]

An interactive desk calculator program that performs arbitrary- precision integer arithmetic (input may be taken from a file). Normally you don't run dc directly, since it's invoked by bc (see bc). dc provides a variety of one-character commands and operators that perform arithmetic; dc works like a Reverse Polish calculator; therefore, operators and commands follow the numbers they affect. Operators include + - / * % ^ (as in C); some simple commands include:

p

Print current result.

q

Quit dc.

c

Clear all values on the stack.

v

Take square root.

i

Change input base; similar to bc's ibase.

o

Change output base; similar to bc's obase.

k

Set scale factor (number of digits after decimal); similar to bc's scale.

!

Remainder of line is a UNIX command.

Examples

3 2 ^ p	Evaluate 3 squared, then print result.
9 
8 * p	Current value (9) times 8, then print result.
72 
47 - p	Subtract 47 from 72, then print result.
25
v p	Square root of 25, then print result.
5
2 o p	Display current result in base 2.
101

Note: Spaces are not needed except between numbers.


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