Three Methods to Automate Password Input for sudo, ftp, and ssh Commands
This article explains three techniques—using echo with a pipe, here‑document redirection, and an Expect script—to supply passwords automatically for sudo, ftp, and ssh commands, enabling non‑interactive execution of privileged or remote operations on Linux systems.
Method 1: Use echo to pipe the password into a sudo command, for example echo "123456" | sudo rm -rf /*, allowing a script such as clear.sh to run without interactive password entry.
Method 2: Use input redirection (here‑document) to feed both username and password to commands that accept them via standard input, such as
ftp -i -n 192.168.21.46 <<EOF<br/>user username password<br/>EOF.
Method 3: Use an expect script to handle interactive prompts, setting a timeout, spawning the ssh command, waiting for the "password:" prompt, sending the password, and optionally keeping the session interactive, as shown in the example code.
Explanation of the Expect script: set timeout 30; spawn ssh -l username 10.125.25.189; expect "password:"; send "the_password"; interact.
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