MySQL命令未从Bash文件运行

Question

I have the following command

  mysql -u root -ppass myDB -e "select * from table limit 10;"

which when I run it from a linux server it works normally (10 tuples are displayed)

When the following is added in a bash file

  echo 'mysql -u root -ppass myDB -e select * from table limit 10;' >> /root/test.log

nothing happens. In the log file, only the echo string is being displayed. Can someone please help me in this?

Answer 1

that is because you just echo your command as a string and redirect the output of echo to the log file. You do nothing else ;-)

Just run the command as you would do on the command line and redirect the output of mysql command (instead of echo ) to your logfile:

#!/bin/sh
mysql -u root -ppass myDB -e "select * from table limit 10;" >> /root/test.log

Answer 2

This is because

mysql -u root -ppass myDB -e "select * from table limit 10;"

Is not the same as

mysql -u root -ppass myDB -e select * from table limit 10;

Try using this:

echo 'mysql -u root -ppass myDB -e "select * from table limit 10;"' >> /root/test.log

And then actually invoke the command

mysql -u root -ppass myDB -e "select * from table limit 10;" >> /root/test.log