Linux command to gathers up information about a Linux system
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uname -a
cat /proc/version Dump or display memory information and swap information: free -m Network card and IP address information: ifconfig -a
ifconfig -a|less Debian / Ubuntu Linux network configuration file (all interface eth0,eth1,...ethN) more /etc/network/interfaces Redhat / CentOS / Fedora Linux network configuration file (eth0) more /etc/sysconfig/network-scripts/ifcfg-eth0
route Display list of all open ports netstat -tulpn View login related logs tail -f /var/log/secure
vi /var/log/secure
grep 'something' /var/log/secure View mail server related logs tail -f /var/log/maillog
vi /var/log/maillog
grep 'something' /var/log/maillog Find how long the system has been running uname
w Show who is logged on and what they are doing w
who Display list of tasks top Display all running process ps aux
ps aux | grep process-name Display list of all installed software on Redhat / CentOS / Fedora rpm -qa
rpm -qa | grep 'software-name'
rpm -qa | less Display list of all installed software on Debian / Ubuntu dpkg --list
If you are developing an application for Linux desktop and would like to automatically find out more information about system, use the following commands in shell scripts to gather information about system. Recently I was involved in project where I need to collect information about running GUI, browser and other information such as disk space, running kernel etc.
Find out KDE Desktop version: konqueror --version Find out Gnome Desktop version: gnome-panel --version Find out Mozilla browser version: mozilla --version Find out Firefox browser version: firefox --version Find out current Language: set | egrep '^(LANG|LC_)' Find out disk space usage: df -h Find/Estimate file space usage: du -h Find out version of Linux glibc: ls -l /lib/libc-*.so /lib/libc.so* Find out user limits: ulimit -a Find out installed device drivers (modules) lsmod Find out information about an X server: xdpyinfoIt can find out:
- Name of display:
- Version number
- Vendor name (such as The XFree86 Project)
- Vendor release number
- And XFree86 version number
OR
free -mOR
free -g Find out user shell name: ps -p $$ | tail -1 | awk '{ print $4 }'Dump Linux kernel variables
/sbin/sysctl -a Find out running Linux kernel version: uname -mrsuname -a
cat /proc/version Dump or display memory information and swap information: free -m Network card and IP address information: ifconfig -a
ifconfig -a|less Debian / Ubuntu Linux network configuration file (all interface eth0,eth1,...ethN) more /etc/network/interfaces Redhat / CentOS / Fedora Linux network configuration file (eth0) more /etc/sysconfig/network-scripts/ifcfg-eth0
Note replace eth1 for 2nd network card and so on.
Display routing information route -nroute Display list of all open ports netstat -tulpn View login related logs tail -f /var/log/secure
vi /var/log/secure
grep 'something' /var/log/secure View mail server related logs tail -f /var/log/maillog
vi /var/log/maillog
grep 'something' /var/log/maillog Find how long the system has been running uname
w Show who is logged on and what they are doing w
who Display list of tasks top Display all running process ps aux
ps aux | grep process-name Display list of all installed software on Redhat / CentOS / Fedora rpm -qa
rpm -qa | grep 'software-name'
rpm -qa | less Display list of all installed software on Debian / Ubuntu dpkg --list
