bc-calc

Use the Unix bc calculator to evaluate arbitrary arithmetic expressions. The skill accepts the expression as a command‑line argument or via standard input.

When This Skill Applies

This skill activates when the user's request involves:

• Basic or advanced arithmetic calculations (addition, subtraction, multiplication, division, modulus)
• Full bc expressions (including scale, sqrt, pi, etc.)
• Any math expression evaluation request

How It Works

1. Parse the mathematical expression from the request or stdin.
2. Pass the expression to bc and capture the output.
3. Return the result, or the bc error message if the expression is invalid.

Usage Examples

# As a CLI command with a single expression
bc-calc "12+34*5"

# With piped input and scale
printf "scale=2; 1/3" | bc-calc

Installation

The skill can be installed with the ClawHub CLI:

openclaw install bc-calc

Or simply place the bc-calc directory under ~/.openclaw/workspace/skills.

Dependencies

• node (>=12)
• bc command‑line tool (usually pre‑installed on Linux/macOS)

Optional Flags

# Show help
bc-calc --help

The help flag displays usage instructions.

NOTE: The math‑library flag -l is now enabled by default, giving access to trigonometric and other advanced functions.

Available functions:

• s(x) : sine, in radians.
• c(x) : cosine, in radians.
• a(x) : arctangent, in radians.
• l(x) : natural logarithm.
• e(x) : e^x.
• j(n,x) : Bessel function of integer order n for x.