Linux Common Command Collection

Linux Common commands: If, for, which, PS, grep, Netstat, lsof, head, tail, sed, awk, cut, Sort, uniq, Dos2unix, find, Xargs, kill)

First, Linux view memory/cpu the highest process situation (note: You can use the command to check the memory of the top 10 processes)

1. View the processes that occupy the highest CPU

PS Aux|head-1;ps aux|grep-v pid|sort-rn-k +3|head

2. View the most memory-intensive processes

PS Aux|head-1;ps aux|grep-v pid|sort-rn-k +4|head

Comments:

This combination of commands is actually the following two lines of command:

PS Aux|head-1

PS Aux|grep-v pid|sort-rn-k +3|head

The first sentence is primarily to get the title (USER PID%cpu%MEM VSZ RSS TTY STAT START time COMMAND).

The next grep-v PID is to remove the title of the PS aux command, that is, grep does not contain the three-letter combination of the PID line, and then the result is sorted using sort.

Sort-rn-k +3 the-rn R in this command is ordered in reverse order, n is sorted by numeric size, and-K +3 is sorted for the contents of column 3rd, and the first 10 rows of data are obtained by using the Head command. (where | represents a pipeline operation)

Supplemental: Content Interpretation

PID: ID of the process

USER: Process Owner

PR: The priority level of the process, the smaller the higher the priority is executed

Ninice: Value

VIRT: Virtual memory consumed by the process

RES: The physical memory occupied by the process

SHR: Shared memory used by the process

S: The state of the process. s for hibernation, R for running, Z for Zombie, n for the process priority value is negative

%CPU: Process Consuming CPU utilization

%MEM: The percentage of physical memory and total memory used by the process

Time+: The total CPU time that is consumed after the process is started, which is the cumulative value of the CPU usage time.

Command: Process start name

Second, the Linux grep command-find multiple conditions

Example: Grep-e "ipaddr| HWADDR "

Linux Common Command Collection