Bad Sector/Bad Block
A bad sector is a sector on a computer’s disk drive that cannot be used due to permanent damage to the disk surface.
There are two ways to detect bad sectors in Linux: you can use the Disk Utility GUI, or use the command line. You can use the badblocks command to check your hard disk for bad sectors:
$ sudo badblocks -v /dev/sdb1 For more info type the following command: $ man badblocks
Badblocks will give us the number of bad sectors in our hard disk drive.
System Information Commands
df: The df command displays filesystem disk space usage for all mounted partitions. “df -h” is probably the most useful – it uses megabytes (M) and gigabytes (G) instead of blocks to report. (-h means “human-readable”)
-h, –human-readable print sizes in human readable format (e.g., 1K 234M 2G)
-T, –print-type print file system type
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 10G 5.1G 4.5G 52% /home /dev/sdb1 25G 23G 2.2G 92% /media/Label $df -hT Filesystem Type Size Used Avail Use% Mounted on /dev/sda1 ext4 10G 5.1G 4.5G 52% /home /dev/sdb1 fuseblk 25G 23G 2.2G 92% /media/Label For more info type the following command: $df --help
du: The du command displays the disk usage for a directory. It can either display the space used for all subdirectories or the total for the directory you run it on.
-h, –human-readable print sizes in human readable format (e.g., 1K 234M 2G)
–si like -h, but use powers of 1000 not 1024
-s, –summarize display only a total for each argument
$ du -h /home/user 1024k /home/user/files 5.1G /home/user $du -sh /home/user 5.1G /home/user For more info type the following command: $du --help
Symbolic Links
NAME
ln – make links between files
SYNOPSIS
ln [OPTION]… [-T] TARGET LINK_NAME (1st form)
ln [OPTION]… TARGET (2nd form)
ln [OPTION]… TARGET… DIRECTORY (3rd form)
ln [OPTION]… -t DIRECTORY TARGET… (4th form)
In the 1st form, create a link to TARGET with the name LINK_NAME. In the 2nd form, create a link to TARGET in the current directory. In the 3rd and 4th forms, create links to each TARGET in DIRECTORY. Create hard links by default, symbolic links with –symbolic. When creating hard links, each TAR? GET must exist. Symbolic links can hold arbitrary text; if later resolved, a relative link is interpreted in relation to its parent directory.
$ ln -s source file or directory (then the) link-name
$ ln -s ~/source-folder/sourcefile /backupfile
How to find your MAC address
There are several ways to open up your Terminal and view your MAC address. And I’ll show some of them. Now, let’s go to Applications > Accessories then startup Terminal.
Type the following in to your Terminal to display your MAC Address.
$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:4c:51:gf:38:5e
inet addr:192.168.100.100 Bcast:192.168.255.255 Mask:255.255.255.0
inet6 addr: fe80::34c:51ff:fegf:385e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:97015 errors:0 dropped:0 overruns:0 frame:0
TX packets:140964 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:41803450 (41.8 MB) TX bytes:121567347 (121.5 MB)
Interrupt:18 Base address:0xb800
$ ifconfig | grep HWaddr eth0 Link encap:Ethernet HWaddr 00:4c:51:gf:38:5e --- It will display a list of your Ethernet card and their MAC address
$ ifconfig | grep Ethernet eth0 Link encap:Ethernet HWaddr 00:4c:51:gf:38:5e --- It will display a list of your Ethernet card and their MAC address
Thanks for dropping by!
How to display your dns via terminal command:
$ cat /etc/resolv.conf nameserver 208.67.123.456 – primary nameserver 208.67.654.321 – secondary
It will display something similar in your screen.
Project.Zeorymer™ 
You must be logged in to post a comment.