从C程序执行Shell命令

Question

Is it possible to write to the stdin of a running shell (Bash) using a C program? Actually I want to execute commands using bash from my C program without using one of the exec*() system calls.

Answer 1

/bin/echo is a C program, usually.

/bin/echo ls | sh

Voilà! AC program just wrote to the standard input of a running shell, and a command was executed. This is demonstrably possible.

man popen is now your friend. (Any more is really beyond SuperUser's scope, as is discussion of other things such as system() and the need for quoting.)