Common commands for viewing logs in Linux

Common commands for viewing logs in Linux systems because in daily work, it is the habit of every administrator to view logs when a problem occurs. as a beginner, for future needs, I will share the following command to www.2cto today. description of the comcattail-f log file...
Common commands for viewing logs in Linux systems because in daily work, it is the habit of every administrator to view logs when a problem occurs. as a beginner, for future needs, today, I will share the following viewing commands with www.2cto.com cattail-f log file description/var/log/message information and error logs after the system is started, it is one of the most common logs in Red Hat Linux./var/log/secure and security-related log information/var/log/maillog and mail-related log information/var/log/cron and logs related to scheduled tasks/var/log/spooler logs related to UCP and news devices/var/log/boot. log daemon starts and stops the relevant log message system: www.2cto.com # uname-a # View kernel/OS/CPU information # cat/etc/issue # cat/etc/redhat-release # 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 loaded kernel modules # env # view the environment variable resources: # free-m # View memory usage and swap zone usage # df-h # view the usage of each partition # du-sh <目录名> # View the size of a specified directory # grep MemTotal/proc/meminfo # view the total memory # grep MemFree/proc/meminfo # view the amount of idle memory # uptime # view the system running time, number of users, and load # cat/proc/loadavg # view the system load disk and partition: # 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 parameter (applicable only to IDE devices) # dmesg | grep IDE # view the network of IDE device detection status at startup: # ifconfig # view the attributes of all network interfaces # iptables-L # View firewall settings # route-n # View route tables # netstat-lntp # View all listening ports # netstat-antp # View all established connection # netstat-s # View network statistics process: www.2cto.com # ps-ef # View all processes # top # real-time display of process status users: # w # View active users # id <用户名> # Viewing specified user information # last # viewing user logon logs # cut-d:-f1/etc/passwd # viewing all users in the system # cut-d: -f1/etc/group # View all groups in the system # crontab-l # view the scheduled task service of the current user: # chkconfig-list # list all system Services # chkconfig-list | grep on # list all started System Service programs: # rpm-qa # View all installed software packages