echo $((20.0/7))
zcalc
bc <<< 20+5/2
bc <<< ‘scale=4;20+5/2’
expr 20 + 5
calc 2 + 4
node -pe 20+5/2 # Uses the power of JavaScript, e.g. : node -pe 20+5/Math.PI
echo 20 5 2 / + p | dc
echo 4 k 20 5 2 / + p | dc
perl -E “say 20+5/2”
python -c “print 20+5/2”
python -c “print 20+5/2.0”
clisp -x “(+ 2 2)”
lua -e “print(20+5/2)”
php -r ‘echo 20+5/2;’
ruby -e ‘p 20+5/2’
ruby -e ‘p 20+5/2.0’
guile -c ‘(display (+ 20 (/ 5 2)))’
guile -c ‘(display (+ 20 (/ 5 2.0)))’
slsh -e ‘printf(“%f”,20+5/2)’
slsh -e ‘printf(“%f”,20+5/2.0)’
tclsh <<< ‘puts [expr 20+5/2]’
tclsh <<< ‘puts [expr 20+5/2.0]’
sqlite3 <<< ‘select 20+5/2;’
sqlite3 <<< ‘select 20+5/2.0;’
echo ‘select 1 + 1;’ | sqlite3
psql -tAc ‘select 1+1
R -q -e ‘print(sd(rnorm(1000)))’
r -e ‘cat(pi^2, “\n”)’
r -e ‘print(sum(1:100))’
smjs
jspl