Linux command to gathers up information about a Linux system
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