Linux Commands

Aug 20, 2015

fs -du -s -h FILE_PATH: show the current file size.

System

Command	Purpose
`uname -a`	Kernel, operating system, and CPU information
`head -n 1 /etc/issue`	Operating-system version
`cat /proc/cpuinfo`	CPU information
`hostname`	Computer name
`lspci -tv`	All PCI devices
`lsusb -tv`	All USB devices
`lsmod`	Loaded kernel modules
`env`	Environment variables

Resources

Command	Purpose
`free -m`	Memory and swap usage
`df -h`	Partition usage
`du -sh <DIRECTORY>`	Size of a directory
`grep MemTotal /proc/meminfo`	Total memory
`grep MemFree /proc/meminfo`	Free memory
`uptime`	Uptime, users, and load
`cat /proc/loadavg`	System load

Disks and Partitions

Command	Purpose
`mount \| column -t`	Mounted partitions
`fdisk -l`	All partitions
`swapon -s`	Swap partitions
`hdparm -i /dev/hda`	Disk parameters, for IDE devices
`dmesg \| grep IDE`	IDE detection during boot

Networking

Command	Purpose
`ifconfig`	Network-interface properties
`iptables -L`	Firewall settings
`route -n`	Routing table
`netstat -lntp`	Listening ports
`netstat -antp`	Established connections
`netstat -s`	Network statistics

Processes

Command	Purpose
`ps -ef`	All processes
`top`	Live process status

Users

Command	Purpose
`w`	Active users
`id <USERNAME>`	A user's information
`last`	Login history
`cut -d: -f1 /etc/passwd`	All users
`cut -d: -f1 /etc/group`	All groups
`crontab -l`	Current user's scheduled tasks

Services

Command	Purpose
`chkconfig --list`	All system services
`chkconfig --list \| grep on`	Enabled system services

Packages

rpm -qa: list installed packages.

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