Redhat Linux Interview Questions and Answers part 6

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Q: – What kind of files or nodes /dev/ directory contains and how do I access or see device files?

 

Block Device Files:-

Block device files talks to devices block by block [1 block at a time (1 block = 512 bytes to 32KB)].
Examples: – USB disk, CDROM, Hard Disk

# ls /dev/sd*

brw-rw—- 1 root root 8, 0 Mar 15  2009 sda
brw-rw—- 1 root root 8, 1 Mar 15  2009 sda1
brw-rw—- 1 root root 8, 2 Mar 15  2009 sda2
brw-rw—- 1 root root 8, 3 Mar 15  2009 sda3
brw-rw—- 1 root root 8, 4 Mar 15  2009 sda4
brw-rw—- 1 root root 8, 16 Mar 15  2009 sdb

Character Device Files:-

Character device files talk to devices character by character.
Examples: – Virtual terminals, terminals, serial modems, random numbers

#ls /dev/tty*

crw-rw—- 1 root root 4, 64 Mar 15  2009 ttyS0
crw-rw—- 1 root root 4, 65 Mar 15  2009 ttyS1
crw-rw—- 1 root root 4, 66 Mar 15  2009 ttyS2
crw-rw—- 1 root root 4, 67 Mar 15  2009 ttyS3
 
Q: – How to install Linux software’s by RPM?

rpm -ivh test-1.0-1.i386.rpm

Q: – If a file associated with test-1.0-1.i386.rpm deleted, than How we will recover that file?

We can reinstall this rpm again.

Q: – Which options are required to upgrade a RPM?

Upgrading a package is similar to installing one. Type the following command at a shell prompt:
rpm -Uvh test-2.0-1.i386.rpm

Q: – In which directory RPM database stored?

 

/var/lib/rpm

 Q: – Tell me the name of device file for PS/2 mouse connection.

 

/dev/psaux

Q: – If you are getting error "package is already installed" but you have to install package any how. what option you will use?

rpm -ivh test-1.0-1.i386.rpm

Preparing… ########################################### [100%] package test-1.0-1 is already installed
In this case you can use "–replacepkgs" option.
rpm -ivh –replacepkgs   test-1.0-1.i386.rpm

Q: – Explain the command "rpm -qa"?

 

It will queries all currently installed packages.

 Q: – Tell me the name of device file for parallel port (Printers).

 

/dev/lp0

Submitted By:-Parveen Kumar            Email-ID: – parveen.antil@gmail.com

 

 

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