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+.Dd June 7, 2019
+.Dt BIT 1
+.Os
+.
+.Sh NAME
+.Nm bit
+.Nd a calculator
+.
+.Sh SYNOPSIS
+.Nm
+.
+.Sh DESCRIPTION
+.Nm
+is an integer calculator.
+Its syntax resembles that of C expressions,
+with the following changes:
+.
+.Bl -bullet
+.It
+Underscores are allowed in integer literals.
+.It
+The
+.Sy 0b
+prefix is used for binary literals.
+.It
+The
+.Sy ->
+operator is used for arithmetic shift.
+.It
+The postfix operators
+.Sy K ,
+.Sy M ,
+.Sy G ,
+.Sy T
+are used as constant multipliers.
+.It
+Single-letter (lower case) variables
+can be assigned.
+The variable
+.Sy _
+stores the previous result.
+.El
+.
+.Sh SEE ALSO
+.Xr operator 7