Linux command to gathers up information about a Linux system

Posted on in Categories CentOS, Debian Linux, Gentoo Linux, Howto, Linux, Networking, RedHat/Fedora Linux, Sys admin, Tips, Ubuntu Linux last updated December 15, 2005

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:

xdpyinfo

It can find out:

  • Name of display:
  • Version number
  • Vendor name (such as The XFree86 Project)
  • Vendor release number
  • And XFree86 version number

Find out information about Linux CPU

cat /proc/cpuinfo

Find out information about Linux Memory

cat /proc/meminfo

OR

free -m

OR

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 -mrs
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

Note replace eth1 for 2nd network card and so on.

Display routing information

route -n
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

Once information collected it can be easily send as an email to help desk. You can use all above command to gathers information about a remote Linux system over secure ssh session (see related functions that gathers up information about a Linux and FreeBSD system). Best part is all above commands runs in non privileged mode.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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44 comment

  9. There’s mistake on one of the entries. To monitor how long a system has been up; use these commands:

    “uptime” or “top” or “w”

    The word uptime; mentally, is usually the easiest to remember which is funny considering it’s a bigger word than the rest, hehe.

    Reply Report comment

  25. The “Find how long the system has been running” section is wrong.
    It says that the commands are : “uname” and “w”, but it should list the commands:
    “uptime” and “top”

    Reply Report comment

  26. Very Information information on this website.

    I think google should first find this site in its search engine and than rest of others.

    I have always found too many of my needs or commands for day to day task from this site.

    keep up…

    Reply Report comment

  35. dmidecode will give you hardware info on the system. All of it, including make and model of the pc, chassis, N/SB. Like this:
    Handle 0x0002, DMI type 2, 8 bytes. Base Board Information
    Manufacturer: Intel
    Product Name: C440GX+
    Version: 727281-001
    Serial Number: INCY92700942
    Read man dmidecode for more.

    Reply Report comment

  36. Hey i’m gonna devolop an operating system.At this time i already gathered minimal info but i cn’t understnd after completing kernel,then what to to for other program applications….so plz help me.plz help me how to arrenge all programs upon kernel…..plzzzzz…….

    Reply Report comment

  39. Does anyone know of a Linux command to obtain the server model number/name?

    I am not speaking of the dmidecode info as that all points to the actual internal hardware components…..I need the model number/name of the actual server all hardware components are installed into…not sure if Linux can provide this information or not??

    Any assistance is appreciated.

    Reply Report comment

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