bash/shell 數學計算

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$ 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

REF:
http://unix.stackexchange.com/questions/40786/how-to-do-integer-float-calculations-in-bash-or-other-languages-frameworks