summary: This article introduces how to use the scp command to automatically enter passwords in Linux environment, including three methods: using SSH key authentication, sshpass tool and expect scripts.
text：
1. Authenticate with SSH key
Step 1: Generate an SSH key pair
ssh-keygen -t rsa -b 4096
Step 2: Copy the public key to the remote server
ssh-copy-id username@Remote server address
Through the above steps, the scp command will no longer prompt for a password when transferring the file.
2. Use the sshpass tool
Install sshpass
sudo apt-get install sshpass #Debian Systemsudo yum install sshpass # RHELsystem
Automatic password entry using sshpass
sshpass -p 'Your password' scp document username@Remote server address:Target path
3. Use expect scripts
Expect script example
#!/usr/bin/expect -f set timeout -1 spawn scp document username@Remote server address:Target path expect "password:" send "Your password\r" expect eof
Run the expect script
chmod +x Script name./Script name
Summarize: Although there are many ways to automatically enter a password, please be sure to pay attention to password security. SSH key authentication is recommended to ensure the security of data transmission.
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