System
see redhat edition
cat /etc/redhat-release
uname -a
cat /proc/version
Check the system startup parameters
cat ~/.bash_profile
Modify system startup parameters
vi ~/.bash_profile
vi /etc/rc.local
vi /etc/profile
The amendment will take effect immediately
. ~/.bash_profile
. /etc/rc.local
. /etc/profile
Synchronization system time
/usr/sbin/ntpdate time.windows.com
Modify system time
date -s "11/20/2003 12:48:00"
date +%Y%m%d%T -s "20081225 10:05:00"
see cpu Information
cat /proc/cpuinfo
Check the system IO bottleneck
sudo iotop -Pm /
Check the space occupied by each disk in the directory
du --max-depth=1 -h /apps/tomcat8/ROOT
rpm install 、 uninstall 、 Lists and queries mysql install
rpm -ivh
rpm -ev --nodeps
rpm -ql xxx.rpm
rpm -qa|grep -i mysql
The Internet
Inquire about 80 Which programs occupy the port
netstat -antp|grep 80
see 8100 Port access statistics
netstat -na |grep 8100 |wc -l
netstat -tunlap|grep 80
edit iptables
vi etc/sysconfig/iptables
Modify NIC IP, And restart
vi /etc/sysconfig/network-scripts/ifcfg-eth0
service network restart
Tools
tar Packaging and decompression
tar -cvfz ***.tar /sourcefolder
tar -xvfz ***.tar -C targetfolder
see tomcat At the end of the log file 200 That's ok
tail -n 200 /apache_tomcat-5.5.20/logs/catalina.out
Modify the current default language
export LANG=en_US
export LC_ALL=en_US
Delete /data/projects/myproject/ Catalog （ And its subdirectories ） All of the .svn Catalog
find /data/projects/myproject/ -name .svn |xargs rm -rf
load and unload U disc
fdisk -l
mount /dev/sdc1 /mnt
umount /mnt
umount -l /mnt （ Unload when idle ）
