dc

Desk calculator

SYNTAX
        dc <options>

OPTIONS

-e EXPR
--expression=EXPR
     Evaluate EXPR as DC commands.

-f FILE
--file=FILE
     Read and evaluate DC commands from FILE.

-h
--help
     Print a usage message summarizing the command-line options, then
     exit.

-V
--version
     Print the version information for this program, then exit.

To exit, use 'q'.

The desk calculator works with postfix notation; rather like many HP Calculators.
Basic arithmetic uses the standard + - / * symbols but entered after the digits

so entering:

100
0.5
*
p

will return 50

"The best way to destroy the capitalist system is to debauch the currency" ~ John Keynes

Related linux commands:

cal - Display a calendar.
expr - Evaluate expressions.
factor - Print prime factors.
units - Convert units from one scale to another.
wc - Print byte, word, and line counts.
Equivalent Windows command: SET /A Display, set, or remove Windows environment variables.