Linux Common commands View logs

Cat
Tail-f
Log file description

1 /var/log/message and error log after system startup is one  of the most commonly used logs in red Hat Linux 2 /var/ log/Secure  Security-related log information 3 /var/log/maillog Message-related log information   4 / var/log/cron log information  related to timed tasks 5 /var/log/Spooler Log information  related to UUCP and news devices 6 /var

System:

1 # uname-a # view kernel/OS/CPU information   2 # cat/etc/issue  3 # Cat/etc/redha T-Release # view OS  version 4 # cat/proc/cpuinfo # View CPU  information 5# hostname # view computer name   6 # LSPCI-TV # list all PCI devices   7 # LSUSB-TV # list all USB devices  /c19>8# lsmod # list loaded kernel modules   9

Resources:

1 # free-M # View memory usage and swap  usage 2 # DF-  H # View each partition usage 3 # du-sh < directory name >  # View the size of the specified directory 4 # grep memtotal/proc/meminfo # View  Total Memory 5 # grep MEMFR ee/proc/Meminfo #  View idle memory 6# uptime # View System uptime, number of users, load   7 # CAT/ PROC/LOADAVG # Viewing system load

Disks and partitions:

1 # Mount | Column-t # view  attached partition status 2 # fdisk-L # View all partitions   3 # swapon-S # view all swap partitions  /c7>4 # hdparm-i/dev/hda # View disk parameters (IDE device only)  5 # DMESG | grep IDE # view IDE device detection at startup  

Internet:

1 # ifconfig # View the properties  of all network interfaces  2 # iptables-L # View firewall settings   3 # route-N # View route table   4 # netstat-LNTP # View all listening ports   5 # netstat-ANTP # View all established connections   6

Process:

1 # PS-EF # View All Processes 2 # top # Real-time display process status (in another article there is a detailed introduction)

User:

1 # w # view active Users   2 # ID < user name > # View specified user information   3# Last # View user log on  log 4 # cut-d:-f1/etc /passwd # View system All users   5 # cut-d:-f1/etc/Group# View system all groups   6

Service:

1 # chkconfig–list # list all system services 2 # Chkconfig–list | grep on # list all started system services

Program:

1 # rpm-qa # View all installed packages

Linux Common commands View logs