uname -a View all kernel information system
View uname -r kernel
cat / etc / redhat-release version View System
cat / proc / meminfo memory information view
free -m view is M units
free -g view of the unit of information is the G
mkdir Create a directory Example: mkdir java
Create a file touch cases: touch go
rm -rf / delete a route path
rm -ri / path delete a path (whether) Note: there will be prompted before deleting
cd to a directory
vi / vim to edit files
ps -ef | grep name need to view a process
top all processes similar to windows task manager
ss -tanl View all listening ports
lsof -i: port number to see whether or not a port monitor
curl ip: port if the port can pass ping Example: curl 120.119.110.315:8001
nc -w 1 ip port </ dev / null && echo "tcp port ok" if you can see through
例：nc -w 1 132.121.213.41 8611 < /dev/null && echo "tcp port ok"
echo "UID of this script: $ UID" get user id
id | awk '{print substr ($ 1,5,4)}' taken (acquisition system user and group id)
Detailed parameters: $ 1 represents the first group of words that is user id $ 2
The first indicates the start of a $ 5 cut from a few, the second 4 bits represent the number of cut
id |awk '{split($2,a,"=");print a[2]}'|awk '{split($1,b,"(");print b[1]}'
Parameters: The first is to take $ 2 represents the group id, user id becomes take $ 1
usermod -u id number of the user name set user id number Example: usermod -u 1001 tele
groupmod -g id number to set the user name of the user group id Example: groupmod -g 1001 tele
View thread handles:
ulimit -a
more /proc/sys/fs/file-max
lsof|awk '{print $2}'|wc -l
Linux single largest file modification process connections:
vi /etc/security/limits.conf add
* Soft nofile 65536
* Hard nofile 65536
Log in again, ulimit -a execution
lsof | wc -l to see all processes of the number of open files
lsof -p pid | wc -l to see the number of files a process opens
echo 3> / proc / sys / vm / drop_caches clean up all caches
systemctl stop firewalld.service 停止firewall
systemctl disable firewalld.service prohibit firewall boot
ifconfig to view ip address
View all ifconfig -a native ip address
ip addr view the virtual machine IP address
curl ifconfig.me query Internet public network ip
ip link set-- change the properties of the device, abbreviation: set, s
ip link show- Display Specifications abbreviation: show, list, lst, sh, ls, ls option appears two or more times, ip will output more detailed error information statistics
ip address add-- add a new protocol address
ip address delete-- delete a protocol address;
ip address show-- display protocol address;
ip address flush-- clear protocol address;
ip neighbour add-- add a new neighbor entry, ip neighbour change-- modify an existing entry, ip neighbour replace-- replace an existing entry, abbreviation: add, a; change, chg; replace, repl;
ip neighbour delete-- delete a neighbor entry;
ip route add-- Add a new route. ip route change-- modify the route. ip route replace-- replace the existing route;
ip route delete-- delete routes, abbreviation: delete, del, d;
ip route show-- routing lists, abbreviation: show, list, sh, ls, l.
Set synchrony timedatectl set-timezone Asia / Shanghai
cp / usr / share / zoneinfo / Asia / Shanghai / etc / localtime set consistent results synchrony supra
ln -sf / usr / share / zoneinfo / Asia / Shanghai / etc / localtime && echo 'Asia / Shanghai'> / etc / timezone time zone setting NOTE: docker vessel with consistent physical area required to machine
hostnamectl set-hostname hostname set the hostname
Set user password never expires
vi / etc / shadow
Find a user needs to modify the last third of the 90 was changed to 99999
sudo usermod -aG docker gdeop
echo -e 'old password \ n new password \ n New Password' | passwd
chmod -R 777 path that is granted permissions for all users 777linux system with root privileges highest
chown -R telecom path telecom users grant
chgrp -R telecom telecom path grant User Group
chmod u + s nginx by permission
Creating user groups groupadd gdeop gdeop
useradd -d path -m user name and user name to create a path
useradd -d path -m gdeop -g group of users to create a path to the user name and join user groups
chown -R gdeop:gdeop /data1/gdeop
useradd gdeop
usermod -a -G gdeop gdeop
passwd username password example: passwd gdeop
Setting a user with root privileges sudo
vi /etc/sudoers
gdeop ALL=(ALL) NOPASSWD: ALL
uname -a # View kernel / linux system operating system / CPU information information command
head -n 1 / etc / issue # check the OS version, not the letter L is the number 1
cat / proc / cpuinfo # View system information linux command CPU information
hostname # View the computer name of the linux command information system
lspci -tv # list all PCI devices
lsusb -tv # lists all USB devices linux command information system
lsmod # listed loadable kernel modules
env # viewing environment variable resources
free -m # View the amount of memory usage and swap
df -h # see how each partition usage
Du -sh * View the size of directories and files
grep MemTotal / proc / meminfo # view the amount of 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 disk and partition
mount | column -t # View articulated partition status
See all partitions fdisk -l #
swapon -s # View all swap partitions
hdparm -i / dev / hda # View disk parameters (only for IDE devices)
dmesg | grep IDE # view when you start the IDE device detects network conditions
ifconfig # view properties for 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 process
ps -ef # view all processes
top # display real-time status of the user process
w # View active users
View information about a specified user id #
View user login log last #
cut -d: -f1 / etc / passwd # View all system users
cut -d: -f1 / etc / group # View all system groups
crontab -l # to view the current user's scheduled tasks service
chkconfig -list # lists all system services
chkconfig -list | grep on # lists all system services program starts
rpm -qa # View all the packages installed
cat / proc / cpuinfo: View CPU-related parameters linux system commands
cat / proc / partitions: View System Information command linux hard disk and partition information
cat / proc / meminfo: memory information see linux system linux system command
cat / proc / version: Check version, similar to the uname -r
cat / proc / ioports: View io port equipment
cat / proc / interrupts: View interrupt
cat / proc / pci: View information pci device
cat / proc / swaps: View information for all swap partitions
cat / proc / meminfo | grep MemTotal view memory size
fdisk -l | grep Disk Check the hard disk size
cat / proc / cpuinfo | grep "model name" && cat / proc / cpuinfo | grep "physical id" view system information clocked
find -type d -empty search for empty folders
docker docker info View details
systemctl daemon-reload reload
systemctl start docker 开启容器systemctl stop docker 停止容器sytemctl enable docker 设置开机启动systemctl status docker 查看docker运行状态systemctl restart docker 重启docker
docker the Inspect CONTAINER_NAME | grep Mounts -A 20 View docker container working directory path
docker info | grep "Docker Root Dir" View docker working directory (mirrored storage container path)
docker diff to see what subfolders affected
docker system prune Remove close container volumes and useless data network, without tag mirror.
docker system prune -a command to clean more thoroughly, the vessel will not use the Docker image are deleted. Note: These two commands will take you temporarily closed containers, as well as temporarily unused Docker image are deleted
Disk Usage docker system df for viewing Docker similar df command on Linux
du -hs / var / lib / docker / command to view disk usage
docker rmi -f `docker images | grep '<none>' | awk '{print $ 3}'` delete a name or label for the mirror none
docker rm `docker ps -a | grep Exited | awk '{print $ 1}'` deleted abnormally stopped container docker
docker images -q --filter "dangling = true" | xargs -t --no-run-if-empty docker rmi remove all mirrors useless
docker exec -it container id / bin / bash into the container
ctrl + p + q exit vessel
docker rm $ (docker ps -aq) remove all containers
docker stop $ (docker ps -a -q) Stop all containers
docker run container tail -f / dev / null to keep the vessel running in the foreground
docker ps view of the container has been running
docker ps -a to view all containers (stop running)
docker inspect the vessel name | grep Address see one container ip
docker inspect --format = '{{Name}.} - {{range .NetworkSettings.Networks}} {. {IPAddress}} {{end}}' $ (docker ps -aq) show all IP addresses containers
ocker container Log Viewer command:
docker logs --tail -f [容器id]
docker logs -f -t --tail rows vessel name
docker logs -f -t --since = "Date" --tail = number of rows of the container name (id)
docker exec -it [vessel id] sh
Creating the groupadd docker docker group
gpasswd -a $ {USER} docker docker users join group
usermod -aG docker telecom telecom users to user groups added to the docker
cat / var / log / log name to view the log
systemctl restart rsyslog restart rsyslog service
man 3 syslog log level view
rpm -q rsyslog logging software
rpm rsyslog log file list -ql
rpm -qc rsyslog View profile
cd / into the root directory
find -name filename example:.. find -name api_center.log
The local directory copied to the remote:
scp -r directory name username @ computer IP or computer name: display details # remote path, add -v parameter
From the remote copy back to the local directory:
scp -r username @ computer IP or computer name: the name of the local directory path
Unzip command:
tar xvf FileName.tar decompression
tar cvf FileName.tar DirName package
gunzip FileName.gz decompression
gzip -d FileName.gz decompression
gzip FileName compression
extracting tar zxvf FileName.tar.gz
tar zcvf FileName.tar.gz DirName 压缩
bzip2 -d FileName.bz2 decompression
bunzip2 FileName.bz2 decompression
bzip2 -z FileName compression
extracting tar jxvf FileName.tar.bz2
compressed tar jcvf FileName.tar.bz2 DirName
bzip2 -d FileName.bz decompression
bunzip2 FileName.bz decompression
bzip2 -z FileName compression
extracting tar jxvf FileName.tar.bz
compressed tar jcvf FileName.tar.bz2 DirName
uncompress FileName.Z decompression
compression compress FileName
extracting tar Zxvf FileName.tar.Z
compressed tar Zcvf FileName.tar.Z DirName
extracting tar zxvf FileName.tgz
tar -zcvf examples.tgz examples (examples of the implementation of the current directory path) compression
extracting tar zxvf FileName.tar.tgz
FileName.tar.tgz FileName compression
unzip unzip FileName.zip
zip FileName.zip DirName compression
rar a FileName.rar decompression
rar e FileName.rar compression
View locale coding system
/ Etc / sysconfig / i18n, such as coding into Chinese:
code show as below:
LANG = en_US.UTF-8
Changed
. code show as below:
LANG="zh_CN.GBK"
After the restart it
export LANG = zh_CN.GBK encoding format set
View Task jobs
nohup and> / dev / null 2> & 1 uses: nohup represents permanent operation. & Means running in the background
In applying Unix / Linux, we generally want a program running in the background, nohup ./start-mysql.sh &