bash 如何将变量传递给远程 bash 脚本

Question

I have local bash script which is used to invoke a bash script in the remote server and get some reports from remote server.

The way I call this script currently in local_script.sh is:

ssh remoteuse@ip "/bin/bash remote_script.sh"

Now, I want to set a date variable in local_script.sh file and variable needs to available in remote_script.sh files also.

Please give some ideas.

EDIT :

Please see my test script:

[user@localserver]$ ssh remoteusr@ip "/bin/bash remote_script.sh $test_var"

And my remote script:

[user@remoteserver]$ cat remote_script.sh
#!/bin/bash
echo $test_var > test_var.log

But test_var.log file on remote server is empty after running the script

Answer 1

远程服务器不知道您的本地变量，您只能在 ssh 行使用额外的参数将变量的值从本地传递到远程：

ssh remoteuse@ip "/bin/bash remote_script.sh $variable"

Answer 2

You have to add the variable to the environment of the executed command. That can be done with the var=value cmd syntax .

But since the line you pass to ssh will be evaluated on the remote server, you must ensure the variable is in a format that is reusable as shell input . Two ways come to mind depending on your version of bash :

1. With bash 4.4 or newer, you can use the Q operator in ${parameter@operator} :

   local script:

    foo="abc'def \\"123\\" *" ssh remoteuse@ip "foo=${foo@Q} /bin/bash remote.sh"

   remote script:

    printf '<%s>\\n' "$foo"

   output:

    $ ./local_script.sh <abc'def "123" *>

2. If you don't have bash 4.4 or newer, you can use the %q directive to printf :

    ssh remoteuse@ip "foo=$(printf '%q' "$foo") /bin/bash remote.sh"