Filter the process PID using SED and cut.

All maintenance cluster users know that they often need to start or stop processes on all nodes. This requires that the PID be obtained first, and the PID can be obtained through PS output, however, information except the PID must be filtered out. This can be done in combination with SED and cut:

Sed supports extended regular expression. You only need to use the-r option in the SED command, for example:

PS aux | grep ypbind | sed-r's // + // G'

This command can be used to cut all spaces in the PS output information into one space, and then:

PS aux | grep ypbind | sed-r's // + // G' | cut-F2-d ""

You can use cut to retrieve the PS fields one by one, because-d "in cut specifies that Delimiter is a space rather than multiple spaces, use sed to convert multiple spaces into one space. In this way, cut will be processed.