Shulou(Shulou.com)06/02 Report--

In the course of actual operation, we often encounter repeated execution of the same command to observe the change of the result. In the past, it was often the way of the arrow and arrow keys plus enter, or Ctr+p and then enter.

Watch-execute a program periodically, showing output fullscreen

SYNOPSIS

Watch [- dhvt] [- n] [--differences [= cumulative]] [--help]

[--interval=] [--no-title] [--version]

Watch repeatedly executes a command to display the result on full screen. This allows you to monitor program output over time, with a default interval of two seconds, using parameters

-n or-interval can specify the time interval.

-d highlight the place where the transition was successful

-t does not display the title title

The commands used in comparison are as follows:

Watch-n 3-d free / / monitors memory usage

Watch-n 1 "df-I" DF "/ / Monitoring the number of disks inode and block

Watch-n 60 from / / Monitoring mail

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