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You can place more than one command in the background. Each is classified as a job and given a name and a job number. The command jobs lists the jobs being run in the background. Each entry in the list consists of the job number in brackets, whether it is stopped or running, and the name of the job. The + sign indicates the job currently being processed, and the - sign indicates the next job to be executed. In the next example, two commands have been placed in the background. The jobs command then lists those jobs, showing which one is currently being executed.
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$ lpr intro & [1] 547 $ cat *.c > myprogs & [2] 548 $ jobs [1] + Running lpr intro [2] - Running cat *.c > myprogs $
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If you wish, you can place several commands at once in the background by entering the commands on the command line, separated by an ampersand, &. In this case, the & both separates commands on the command line and executes them in the background. In the next example, the first command, to sort and redirect all files with a .l extension, is placed in the background. On the same command line, the second command, to print all files with a .c extension, is also placed in the background. Notice the two commands each end with &. The jobs command then lists the sort and lpr commands as separate operations.
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$ sort *.l > ldocs &; lpr *.c & [1] 534 [2] 567 $ jobs [1] + Running sort *.l > ldocs [2] - Running lpr $
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After you execute any command in Linux, the system tells you what background jobs, if you have any running, have been completed so far. The system does not interrupt any operation, such as editing, to notify you about a completed job. If you want to be notified immediately when a certain job ends, no matter what you are doing on the system, you can use the notify command to instruct the system to tell you. The notify command takes a job number as its argument. When that job is finished, the system interrupts what you are doing to notify you the job has ended. The next example tells the system to notify the user when job 2 has finished:
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You can bring a job out of the background with the foreground command, fg. If only one job is in the background, the fg command alone will bring it to the foreground. If more than one job is in the background, you must use the job's number with the command. You place the job number after the fg command, preceded with a percent sign. A bg command also places a job in the background. This command is usually used for interrupted jobs. In the next example, the second job is brought back into the foreground. You may not immediately receive a prompt again because the second command is now in the foreground and executing. When the command is finished executing, the prompt appears and you can execute another command.
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If you want to stop a job running in the background, you can force it to end with the kill command. The kill command takes as its argument either the user job number or the system process number. The user job number must be preceded by a percent sign, %. You can find out the job number from the jobs command. In the next example, the jobs command lists the background jobs; then job 2 is canceled:
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$ jobs [1] + Running [2] - Running $ kill %2 $ lpr intro cat *.c > myprogs
You can also cancel a job using the system process number, which you can obtain with the ps command. The ps command displays a great deal more information than the jobs command does. It is discussed in detail in 29 on systems administration. The next example lists the processes a user is running. The PID is the system process number, also known as the process ID. TTY is the terminal identifier. The time is how long the process has taken so far. COMMAND is the name of the process.
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