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Handy use of bc in the command line. No need to get 'into' the bc to perform calculations
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bc
hmm, it seems as if that triple less ran into trouble. Let's see if this works:
bc <<< 2+3I use
calc() { echo $@ | bc -ql; }
bash is already the calculation
echo $((2+3))
5
nice, but bash already has built-in math, also via `expr` and `let`
still up-voting because bc is the bomb-diggity
<<< 2+3 bc