Not mine and I don’t remember the source, but really useful: # Simple calculator function calc() { local result="" result="$(printf "sc

Not mine and I don’t remember the source, but really useful: # Simple calculator function calc() { local result="" result="$(printf "scale=10;$*\n" | bc --mathlib | tr -d '\\\n')" # └─ default (when `--mathlib` is used) is 20 # if [[ "$result" == *.* ]]; then # improve the output for decimal numbers printf "$result" | sed -e 's/^\./0./' `# add "0" for cases like ".5"` \ -e 's/^-\./-0./' `# add "0" for cases like "-.5"`\ -e 's/0*$//;s/\.$//' # remove trailing zeros else printf "$result" fi printf "\n" }