问题
I am in MySQL and would like to change the current working directory. I tried to execute:
mysql> system cd './my_dir'
However, this does not seem to work. Has anyone run into a similar problem?
回答1:
System is going to spawn a child process to run a shell command.....
Current working directory is a process level property....so you can't change it in the parent from a child process. That's why it doesn't work.
I briefly scanned the MySQL docs at http://dev.mysql.com/doc/refman/5.5/en/mysql-commands.html but didn't see a direct CD command that changes the working directory. I think an adventurous person could write one....
回答2:
If you want to change your current working directory for a script, then use the && between the CD and script so it will change directory and then if that's successful it will execute the second command.
mysql> SYSTEM cd /home && ls
回答3:
What you're looking for is the escape to shell command: \!
mysql>\! cd ./my_dir
You can even use it to escape to the shell completely and then come back to the mysql environment.
mysql>\! bash
bash>cd ./my_dir
bash>exit
mysql>SELECT * ALL FROM <table>;
来源：https://stackoverflow.com/questions/7457056/mysql-system-command