how to run commands like ftp or sftp or scp in background? Also how to setup password less connection for running these command?
Look for manual pages for scp or rsync, which both can do this job well, if not being forced you don't want to use sftp or even the non encrypted ftp file transfer!
something like the following, for example:
rsync [some other parameters] -e ssh SOURCE TARGET
Assuming these commands are coming from a bash script , you would need to make sure that the two (or more ) systems have ssh certificates generated that allow you to access said systems without providing a "password" per se.
Briefly, you could do it by running this command on one system:
ssh-keygen
following through, this will generate a key. Then run:
ssh-copy-id user#some-remote-system
to copy it to the remote system, which will allow passwordless access, enabling scripts to go about their business without stalling for password prompts.
Related
I am developing a number of applications that need a bit more power than my local machine has. So I'd like to run them on a remote machine. This is all fairly straightforward and runs something like: 1) rsync the files in the current directory to the remote machine in some location, 2) ssh to remote machine run the command. In some cases, if the remote command generates a file, I'd need to pull that back locally also.
It feels to me like such a common set of tasks that should be a nice command that puts it all together. Say something like
## Run make on the the files in the current directory on big-server-box
rrun big-server-box make
## Do the same, but pull output.txt back afterward
rrun big-server-box -f output.txt make
## Open a shell, having synced files first
rrun big-server-box --shell
Is there any tool that achieves this?
There is already a mechanism for accomplishing what you’re looking for: ssh.
If you want your specific syntax, you could very easily write a wrapper script. The only things different from your syntax above is the -f flag to copy files back to your local machine (which would be easy to implement with scp) and the --shell flag, which can be omitted since that behavior is implied with ssh. Other than that, the syntax is identical: call ssh instead of rrun and you have what you’re looking for.
I am developing a script that will automatically keep a folder on two workstations synchronized using rsync. So far, I have gotten everything to work but I have one small thing I haven't figured out. Once, the rsync command is executed, it prompts for the password of the other workstation. However, I haven't been able to find a way to automatically enter that password once prompted in the terminal. I tried using the expect command, but that didn't work as the command didn't execute until after I enter the password.
Is there a solution to this?
Here is my script. I have two instances of the same VM, hence the same usernames
#!/bin/bash
LOCAL="/home/rams/Documents/"
RSYNC_OPTIONS="-avh --progress /home/rams/Documents/ rams#192.168.1.39:/home/rams/Downloads/"
PASSWORD="rams2020"
while true
do
inotifywait -e modify $LOCAL
rsync $RSYNC_OPTIONS
done
Solution shown here:
https://stackoverflow.com/a/3299970/8860865
TL;DR - Use an SSH keygen to generate a keyfile that will authenticate upon using the rsync command and the password is prompted. https://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/
Hi I have been given a task of copying files from a given server to local machine. Even I can do it manually using the command line but I need to write a script to automate it. I dont have any clue how to do it using shell, how to give the password which we would have done manually. I went through other posts but did not get the precise answer.
Are there better ways than using SCP command?
Thanks in advance
The preferred + more secure way to do this is to set up ssh key pairs
That being said, if there's a specific need to supply passwords as part of your shell script, you can use pscp, which is part of putty-tools:
If you are on ubuntu, you can install it by:
sudo apt-get install putty-tools
(Or use equivalent package managers depending on your system)
Here's an example script of how to use pscp:
#!/bin/bash
password=hello_world
login=root
IP=127.0.0.1
src_dir=/var/log
src_file_name=abc.txt
dest_folder=/home/username/temp/
pscp -scp -pw $password $login#$IP:$src_dir/$src_file_name $dest_folder
This copies /var/log/abc.txt from the specified remote server to your local /home/username/temp/
I am fully aware that this question has been asked many times but I cant able to find any solution which satisy my requirement.
Task -> I need to transfer files from machine A to machineB and remotely execute scripts on Machine B. Due to my limitation I cant able to use keygen, expect utility or any other utility which requires to install packages. To Transfer the file I need to give password and I want to give password in Url. as this will run inside bash script and requires no user interference .
My investigation- I thought of using scp but realise, its not possible to give password at command prompt. So i wondering , if there is any other alternative from rsync .
below is the small attempt
#!/bin/bash
PATH=/usr/bin:/usr/sbin:/bin:/sbin
USER="bob"
RSYNC_PASSWORD="blue"
MACHINE_B="192.168.200.2"
if ping -c 1 -W 1 $MACHINE_B
then
echo "There is machine b as well"
echo " cheking to transfer file to machine b"
rsync lol.sh 192.168.200.2:/home/bob/
fi
Thanks and regards,
Sam
I have tried various option mentioned above ,, but unfortunately none of them works in my case. But I would like to thanks everyone for helping me and surely I have learned few new things specially rsync.
In my case, I have to rely on ssh keys to make it work.
From the rsync man page:
Some modules on the remote daemon may require authentication. If so, you will receive a password prompt when you connect. You can avoid the password
prompt by setting the environment variable RSYNC_PASSWORD to the password you want to use or using the --password-file option. This may be useful
when scripting rsync.
I try to create my own linux bash script that calls truecrypt for mounting. As option a need to set the password for the truecrypt file. I can do this inside the bash script but if someone open it, they can see the password. The script will later run automatically.
My question: Is there some safe way to hide/encrypt the password?
Example:
truecrypt --mount --password="testing" /home/username/test.tc /home/username/mount/
Thanks for any help!
Use SHC. It encrypts shell scripts using RC4 and makes an executable binary out of the shell script which you can run.
Download SHC(http://www.datsi.fi.upm.es/~frosal/) and install it.
Create a shell script with in "truecrypt --mount --password="testing" /home/username/test.tc /home/username/mount/" andsave it as "yourfilename.sh".
Now, run the command :
shc -f yourfilename.sh
The switch "-f" specifies the source script to encrypt. The above command will create two files: yourfilename.sh.x.c and yourfilename.sh.x.
The program "shc" creates C source code out of your shell script then encrypts it (yourfilename.sh.x.c). The encrypted shell script is: yourfilename.sh.x. Run that binary and it executes your commands:
./script.sh.x
There is no safe way to store the password without someone being able to read it. The only options you have are to use user rights to limit who can see it. You can make the script readable only to the user who's password is in it as one options. Another is to have the script read the password from a file which has a similar permission set (this just gives you more flexibility with updating the script and such).
Ultimately though any admin/superuser can read the file anyways so this isn't something you can do safely. The thing most people suggest is to have the script run automatically and present a GUI for the user to input their password. These vary based on your distribution but they are usually there.