Common commands for Linux system patrol

Linux system needs regular inspection to check server hardware and software usage, the equivalent of physical examination, to ensure timely detection of problems, solve problems, reduce losses, commonly used patrol command as follows:

# uname-a # View kernel/Os/cpu information

# head-n 1/etc/issue # view OS version

# cat/proc/cpuinfo # View CPU Information

# hostname # View computer name

# LSPCI-TV # list all PCI devices

# LSUSB-TV # list all USB devices

# lsmod # List of loaded kernel modules

# env # View Environment variables

# free-m # View memory usage and swap area usage

# df-h # View the usage of each partition

# du-sh < directory name > # View the size of the specified directory

# grep Memtotal/proc/meminfo # View Total Memory

# grep Memfree/proc/meminfo # View the amount of free memory

# uptime # View System uptime, number of users, load

# cat/proc/loadavg # View System load

# Mount | COLUMN-T # Viewing the status of a mounted partition

# fdisk-l # View all partitions

# swapon-s # View all swap partitions

# hdparm-i/dev/hda # View disk parameters (for IDE devices only)

# DMESG | grep IDE # View IDE device detection status at startup

# ifconfig # View the properties of all network interfaces

# iptables-l # View firewall settings

# route-n # View the routing table

# netstat-lntp # View all listening ports

# NETSTAT-ANTP # View all established connections

# netstat-s # View Network statistics

# ps-ef # View All Processes

# top # Real-time display of process status

# w # View active Users

# ID < user name > # view specified user information

# last # View user log in log

# cut-d:-f1/etc/passwd # View All users of the system

# cut-d:-f1/etc/group # View all system groups

# crontab-l # View all user's scheduled tasks