Bird Brother Linux Private vegetable Note (c): System Management

Disk quotas

The real disk quota is read/etc/mtab, which needs to be restarted before it can be rewritten with/etc/fstab's new data.

Establishment of a routine order

Only once with the AT command: at [-m] time where-m when the job is completely notified to the user by mail. At [-m] time, the at prompt appears and the user can execute multiple commands.

/etc/at.allow and/etc/at.deny can be used to limit the use of at.

ATQ can query the current host at task, ATRM [Jobnumber] can cancel the task.

Routine commands with Crontab:crontab [-u username] [-l |-E |-r] where-u establishes, deletes crontab,

-e Edit crontab,-l View crontab,-r delete content from crontab.

Similarly, there are files/etc/cron.allow and/etc/cron.deny to restrict the use of at.

Crontab can use commands, and scripts can be used in/etc/crontab:

Chapter 17th procedure and resource management

Observe the current background job status: Jobs [-lrs] Where-l lists all,-R lists running (run),-s list paused (stop).

Take the background job to the foreground processing: FG%jobnumber where "%" is optional.

Let the job run in the background: BG

Kill-signal%jobnumber. KILL-L lists the available signal, where 1 re-reads the parameter's settings file (similar to reload),

-2 means that ctrl+c,-9 is forced to delete,-15 is terminated in the normal way.

Top [-d] [-BNP] where-D after the number of seconds, that is, update the number of seconds, the default is 5 seconds,

-B performs top,-n with-B in batch mode, specifies the output of several top commands, and-p specifies a PID for observation monitoring.

Basically, each PID is stored in the/proc in the directory type.

Bird Brother Linux Private vegetable Note (c): System Management