Detailed Linux background running commands (4)

Running commands cron, crontab, at, and & in the Linux background run when the account is logged on. If you are not an administrator, you may want to exit the account, but if the process fails to run when it exits, this Linux background command will be very useful.

Nohug

If you are running a process and you think the process will not end when you exit the account, you can use the n o h u p command. This command can continue running the corresponding process after you exit the account. N o h u p means no hang up ).

The command is generally in the following format:

Code:

Nohup command &

Use the Linux background to run the command nohup to submit a job

If you use the n o h u p command to submit a job, all the output of the job is redirected to a job named n o h u p by default. unless the output file is specified separately in the o u t file:
Code:

Nohup command> myout. file 2> & 1

In the preceding example, the output is redirected to the m y o u t. f I l e file.

Let's take a look at an example to verify whether the job can continue running after you exit the account. We will first submit a log clearing process named p s 1:
Code:

$ Nobup ps1 &

Now exit the s h e l, log on again, and then execute the following command:
Code:

$ Ps x | grep ps1

We can see that the script is still running. If the system does not support the ps x command, run the ps-ef | grep ps1 command.

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