Useful commands to get information about your system on Linux...! pwd This comma

Useful commands to get information about your
system on Linux...!
pwd
This command is short for ‘print working directory’,
which is exactly what it does.
hostname
The machine that is currently being worked on is
known as the local host. The command ‘netconf’
can be used to change the name of the local host
and ‘hostname’ is used to print the local host’s
name.
whoami
As the name suggests, this command prints the
user’s login name.
id username
Unlike the above command, this one prints the user
id of the user along with his group id, effective id
and all the supplementary groups that are
involved.
date
This command can be used for both printing and
changing the date and time of the operating
system.
time
The amount of time that a particular process is
allowed to take can be changed using this
command. It’s different from the date command.
who
This command tells the user who all are logged
into the machine.
rwho -a
This is the same as the above, but it tells you the
users that are logged into the network. In order for
this to run, the rwho service has to be enabled.
finger user_name
This command gives the system information of a
particular user.
last
This one gives a list of users that were last logged
in to the system that you are using.
history | more
As the name suggests, the history command shows
the previous commands that had been executed on
the account that you are on. The | more is used to
make the display stop whenever the screen is full.
uptime
This command gives you the time elapsed after the
last reboot.
ps
The print status command lists the processes that
are being run on the system by the user.
ps axu | more
This lists all the processes that are running.
top
This command keeps on listing the processes that
are running currently.
uname -a
This command stands for Unix name with option
‘all’. It displays all the information about your
local server.
free
This gives information about available memory,
which is displayed in kilo bytes.
df -h
This one gives information about the file systems
in a form that is understandable outside the
machine.
du / -bh | more
This command starts at the root level and prints
the disk usage information for each subdirectory
available.
cat /proc/cpuinfo
There is a file called cpuinfo and this command
shows the content in it.
cat /proc/version
This command will tell you the Linux version that
you are using and then some other information as
well.
cat /proc/filesystems
This command is responsible for showing the type
of file systems, which are being used currently.
cat /etc/printcap
This command can be used to see the printer
setup.
lsmod
This command should be used when you are a
non-root user for the system. It shows the Kernel
modules.