Shell to view system information

System
# Uname-A # view kernel/operating system/CPU Information
# Head-N 1/etc/issue # view the operating system version
# Cat/proc/cpuinfo # view CPU Information
# Hostname # view the computer name
# Lspci-TV # list all PCI devices
# Lsusb-TV # list all USB devices
# Lsmod # list loaded Kernel Modules
# Env # view environment variables
Resources
# Free-M # view memory usage and swap zone usage
# DF-h # view the usage of each partition
# Du-SH <Directory Name> # view the size of a specified directory
# Grep memtotal/proc/meminfo # view total memory
# Grep memfree/proc/meminfo # view the Amount of idle memory
# Uptime # view system running time, number of users, and load
# Cat/proc/loadavg # view system load
Disks and partitions
# Mount | column-T # view the status of the mounted Partition
# Fdisk-L # view all partitions
# Swapon-s # view all swap partitions
# Hdparm-I/dev/hda # view disk parameters (only applicable to ide devices)
# Dmesg | grep ide # view the IDE Device Detection Status at startup
Network
# Ifconfig # view the attributes of all network interfaces
# Iptables-L # view firewall settings
# Route-N # view the route table
# Netstat-lntp # view all listening ports
# Netstat-antp # view all established connections
# Netstat-s # view network statistics
Process
# Ps-Ef # view all processes
# Top # display Process status in real time
User
# W # view active users
# Id <User Name> # view specified user information
# Last # view User Logon logs
# Cut-D:-F1/etc/passwd # view all users in the system
# Cut-D:-F1/etc/group # view all groups in the system
# Crontab-L # view the scheduled tasks of the current user
Service
# Chkconfig -- list # list all system services
# Chkconfig -- list | grep on # list all started system services
Program
# Rpm-Qa # view all installed software packages

Use the find command to search for recently modified files
This article is reproduced from the network base camp: [url] http://www.xrss.cn/dev/linux/200751213231.html#/url]

On Linux terminals, there is no graphic interface tool as useful as Windows Search, but the find command is indeed very powerful.
For example, you can use find/-name targetfilename to find a file by name. Alas, if you only know the name and the location, this is also a brutal and effective method.
The parameter-atime access time-ctime indicates the time when the status is changed-the time when the mtime is modified. Note that the time here is in 24 hours. After you view the man manual, you will be confused:-mtime N: file <A1> <af> S data was last modified N * 24 hours ago. literally, it is the last modification of the file that occurred N 24 hours ago, but in fact
Find./-mtime 0: returns the file modified in the last 24 hours.
Find./-mtime 1: the first 48 ~ Files modified within 24 hours. Instead of files modified within 48 hours.
What files have been modified in the last 10 days? Find also supports expression relational operations, so we can add up data from the past few days day by day:
Find./-mtime 0-o-mtime 1-o-mtime 2 ...... Although it is relatively earthy, it is also a method.
There is no better way, I want to know...
In addition, the-mmin parameter-Cmin/-Amin is similar.