"Operation Control Series"-"Linux command five-minute series" Ten

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I haven't made this series in a long time. have been looking at Perl. Now return. Because all scripts are found to be based on Linux commands ...= =In Layman's words, a Job control command is used to control a task. 1 I want to put the updatedb command (the command to re-establish the whole index) to run in the background. Because I don't want to watch the machine build the index, I want to make a program:# UpdateDB &[1] 23336Note: Add a space after the command you want to execute, plus the & symbol to enable background execution. The returned [1] indicates that this is the first task you put into the background. 23336 is the process number for this task.

2 I forgot to add & when I executed updatedb, what do I do? There are ways to:Press the Ctrl-z key on the keyboard, you can throw the foreground task to the backstage! But it is important to note that, with ctrl-z words, this task to the backstage but stopped state. (You have ruthlessly ctrl-z it to the backstage, how can it still work hard to continue working in the background? )3 I learned this trick, I put a lot of programs in the background to execute. I'd like to check:# Jobs[1]+ Running UpdateDB &Note: A list of tasks that are running in the background is displayed4 I'm finished with programming. Want to put the updatedb back to the front desk to see. # FG%1Note: The F in FG indicates the meaning of front, the foreground. %1 represents a task number 1th listed in the Jobs command. If it's task number 2nd, I guess you know how to write it. 5 If you use the jobs command to find a task that shows [stopped] (the task number is 2), I want this task to continue executing in the background:# bg%2Note: The status of stopped usually occurs after the user ctrl-z. 6 I want the background task number to be 3 for the task to be canceled:# Kill%3Note: This kills a background task with task number 3.

"Operation Control Series"-"Linux command five-minute series" Ten