How to pass the value of a variable to the stdin of a command?

Question

I\'m writing a shell script that should be somewhat secure i.e. does not pass secure data through parameters of commands and preferably does not use temporary files. How can

Answer 1

I liked Martin's answer, but it has some problems depending on what is in the variable. This

your-command <<< """$your_variable"""

is better if you variable contains " or !