html - how to avoid printing 'echo' output with system command in C -

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system("echo 'abcpasswd' | su - newusr -c 'ls -ltr'");

above code embedded in 'c' code generats binary , later called html page. above code prompts 'password' piped in command. end seeing prompt 'password:' in html rendered page.

how around ?. don't want prompt 'password:' seen on webpage.

for security reasons, su doesn't takes password everywhere else interactive terminal. option - full login not standard input reading.

you may use sudo can control better (read os manual it), beware using such in non interactive mode considered harmful...


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