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Ssh shell scripting5/6/2023 ![]() ![]() rw-rw-r- 1 tools tools 168 Oct 4 12:20 get_host_info.shĪs a useful tip, we can also add a couple of clean-up commands like rm, mv to make the destination clean after proper exiting. Remote-machine# sshpass -p ' ' scp -r :/home/tools/cw/baeldung/get_host_info.sh. Remote-machine# cd /home/tools/baeldung/auto-test Remote-machine# mkdir -p /home/tools/baeldung/auto-test Finally, it safely terminates the communication channel using the exit command: local-machine#. The program executes the copied get_host_info.sh using the BASH command in the remote box. (when not using the Remote - SSH extension) or for some complex shell setups. Here, sshpass is used to send the password inline to the scp command for copying the main script. By default, the shell integration script should automatically activate on. The program creates the test environment by creating a directory and copying the main script from the source machine. Depending on the CLI pattern, it sends the password for successful login. In the first step, it spawns a new ssh session with the remote server. The credentials and IP address of the remote box are the input arguments to the program: local-machine# chmod 755 get_host.exp Īpply the executable permissions on the created expect program using the chmod command. Sshpass -p ' ' scp -r :/home/tools/cw/baeldung/get_host_info.sh. To better assimilate, let’s write an expect the program to run a script in the remote machine from the localhost.Ī simple expect script is explained below that login to the remote box first, copies the script from the source to the remote machine, and subsequently executes it: #!/usr/bin/expect Usually, expect scripting in Linux enables the automation of multiple CLI terminal-based processes. The option -pw in unison with the option -m bolsters its faster integration with Windows batch scripts for better management of remote servers: C:\Users\baeldung.01\Downloads>.\plink.exe -m get_host_info.sh -pw Hence, plink supports the inline password feature using the option -pw. Obviously, it will be tedious to type the password at all times. Now, plink launches the subshell in the remote machine for executing the get_host_info.sh in our local Windows machine. Lastly, we have to provide the password to authenticate the session. Further on, communication is fully encrypted using AES-256 and HMAC-SHA1 algorithms. Thirdly the Diffie-Hellman key exchange algorithm is used for exchanging the cryptographic keys between two machines. Initialised HMAC-SHA1 server->client MAC algorithm Initialised AES-256 SDCTR server->client encryption Initialised HMAC-SHA1 client->server MAC algorithm Initialised AES-256 SDCTR client->server encryption So I need to solve either one of two problems:Ĭan I somehow create a "virtual" tty with a specific width to use in the shell script? I've been looking into "screen" but have yet to see how to specify a width of 160.Using Diffie-Hellman with standard group "group14"ĭoing Diffie-Hellman key exchange with hash SHA-1 The command SEEMS to have completed correctly, "eof" and all, but somehow the output to stdout isn't always completely flushed? SOMEtimes the "expect" command's output is truncated at the end, and the last few lines are missing (with the final visible entry usually shortened). While that lets me specify the screen size appropriately, there's a weird intermittent issue. Send - "/interface print stats without-paging detail\r" I've tried using "expect" instead, which. And for my needs, it works best when my tty is 160 characters wide.Īnd a MAJOR issue is that when issued from within my cshell script, since there's no tty at all (just stdin/stdout), the mikrotik just gives NO output. One annoyance about that second command, it somehow knows how wide your terminal is and adjusts its output accordingly. Sshpass -f /path/to/pass.txt ssh '/ppp active print terse without-paging' > $/ssh2.out There are two commands on the mikrotik, I can parse their outputs fine. For simplicity's sake my examples below use "sshpass" instead of key generation, but you do you. I'm having a weird time setting up a cshell script that monitors the bandwidth used for pppoe clients on a mikrotik router. ![]()
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