This article explains some of the most used Linux commands and their basic usage which will be more helpful for beginners. All these commands should be entered at the command prompt and you must press the ENTER button to execute the desired command. Please note that all Linux commands are case sensitive.
11. cat - Concatenate and print (display) the content of files.
12. echo - Display message on screen.
13. clear - Clear terminal screen.
14. df - Display free disk space of whole file system.
15. df -h - Display free disk space of whole file system in human readable.
16. du -h - Display space used by specific directory in human readable and list what all files,sub-directory available in that directory and all there space used in details .
17. du -csh - Display only total space used by specific directory in human readable.
18. exit - Exit the command prompt shell.
19. free - Display memory usage.
20. free -m - Display memory usage in human readable(MB).
root@linuxstorage:~# cat newfile
This file have list of data.
12. echo - Display message on screen.
root@linuxstorage:~# echo newfile
newfile.
13. clear - Clear terminal screen.
14. df - Display free disk space of whole file system.
root@linuxstorage:~#df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 151189708 9336308 134173400 7% /
tmpfs 1858556 216 1858340 1% /dev/shm
/dev/sda1 3120456 97448 2864496 4% /boot
15. df -h - Display free disk space of whole file system in human readable.
root@linuxstorage:~#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 145G 9.0G 128G 7% /
tmpfs 1.8G 216K 1.8G 1% /dev/shm
/dev/sda1 3.0G 96M 2.8G 4% /boot
16. du -h - Display space used by specific directory in human readable and list what all files,sub-directory available in that directory and all there space used in details .
root@linuxstorage:~#df -h
8.0K ./.gnome2/keyrings
16K ./.gnome2/accels
4.0K ./.gnome2/panel2.d/default/launchers
8.0K ./.gnome2/panel2.d/default
12K ./.gnome2/panel2.d
44K ./.gnome2
4.0K ./Templates
4.0K ./Pictures
324M .
17. du -csh - Display only total space used by specific directory in human readable.
root@linuxstorage:~#df -csh
324M .
324M total
18. exit - Exit the command prompt shell.
19. free - Display memory usage.
root@linuxstorage:~#free
total used free shared buffers cached
Mem: 3717116 1837284 1879832 0 225776 1041684
-/+ buffers/cache: 569824 3147292
Swap: 8290296 0 8290296
20. free -m - Display memory usage in human readable(MB).
root@linuxstorage:~#free -m
total used free shared buffers cached
Mem: 3629 1794 1835 0 220 1017
-/+ buffers/cache: 556 3073
Swap: 8095 0 8095
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