CODEWITHSUNDEEP
shell
liam xu
liam xu

Reputation: 3030

What does this shell script mean? mysqld_safe --user=mysql &

mysqld_safe --user=mysql & was used to startup mysql. I want to know how does shell script receive parameter like --user=mysql.

And what does & signal mean here?

Upvotes: 0

Views: 378

Answers (1)

fedorqui
fedorqui

Reputation: 289775

& means that the process will be working on background.

From man bash:

If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0.

In practice, it means that you can launch the mysqld_safe --user=mysql command and keep working on that terminal.

Test

$ sleep 5
                ### 5 seconds
$ 


$ sleep 5 &
[1] 4009
$ jobs          ### shows current background processes
[1]+  Running                 sleep 5 &
$ 
[1]+  Done                    sleep 5
$

Upvotes: 1

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