Linux IDE RedHat firewall activity.
cat
tail -f
Log file
description /var/log/message Information and error logs after system startup, which is one of the most commonly used logs in Red Hat Linux
/var/log/secure Security-related log information
/var/log/maillog Mail-related Log information
/var/log/cron Log information related to scheduled tasks
/var/log/spooler Log information related to UUCP and news devices
/var/log/boot.log Log information related to daemon start and stop
System:
# 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 environment variable
resources:
# free -m # View memory usage and swap usage Volume
# df -h # View the usage of each partition
# du -sh <directory name> # View the size of the specified directory
# grep MemTotal /proc/meminfo # View the total amount of memory
# grep MemFree /proc/meminfo # View the amount of free memory
# uptime # View system running time, number of users, load
# cat /proc/loadavg # View system load
disks and partitions:
# mount | column -t # View mounted partition status
# fdisk -l # View all partitions
# swapon -s # View all swap partitions
# hdparm -i /dev/hda # View disk parameters (only for IDE devices)
# dmesg | grep IDE # View IDE device detection status at startup
Network:
# ifconfig # View properties of all network interfaces
# iptables -L # View firewall Setting
# route -n # View 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 process status in real time (detailed in another article)
User:
# w # View active users
# id <username> # View specified user information
# last # View user login log
# 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 task
services 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 packages