# yacas > Yet Another Computer Algebra System. > More information: . - Start an interactive `yacas` session: `yacas` - While in a `yacas` session, execute a statement: `{{Integrate(x)Cos(x)}};` - While in a `yacas` session, display an example: `Example();` - Quit from a `yacas` session: `quit` - Execute one or more `yacas` scripts (without terminal or prompts), then exit: `yacas -p -c {{path/to/script1 path/to/script2 ...}}` - Execute and print the result of one statement, then exit: `echo "{{Echo( Deriv(x)Cos(1/x) );}}" | yacas -p -c /dev/stdin`