Usage notes for Command

Usage notes

When you use Command to deploy applications with Alibaba Cloud Toolkit, note the following:

• Commands are executed by the root user. To run a command as a different user, switch the user within the script.

• Do not use the sleep command in your script.

• Do not use non-terminating commands, such as tail -f, in your script.

Example

The following script was used in an attempt to deploy an application, but the script failed to execute.

#! /bin/shell
pkill -f test.jar
sleep 5
rm -rf test.log 
nohup java -jar test.jar > test.log &
tail -f test.log
            

Analysis:

• The script contains a sleep command, which must be removed.

• The script contains the non-terminating command tail -f. This command must be removed.

Modify the script as follows to ensure that it runs successfully. These changes are based on the usage notes for Command.

#! /bin/shell
source /etc/profile
pkill -f test.jar
rm -rf /home/test.log
nohup java -jar /home/test.jar > /home/test.log &