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Execution

• Command is bc
• To have float answers, ie: 1/100 we need to execute with mathlib using bc -l
• Most users don't execute the app directly, but rather pipe the expression string into bc, ie: echo "300/7" | bc -l.
• We can control the precision with the use of scale Environment variable and removal of the numbers before the . similar to this answer.

Recall previous operation

• Within bc, we may use the . special character to capture the previous value

1+5
.-2

The answer is 4.

References

• This linux journal article has many tips already