Tag: operating systems

Questions Related to operating systems

What does lspv do?

technology operating systems

  1. List all physical volumes

  2. List all physical partitions

  3. List all logical partitions

  4. List PP size

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Correct Option: A

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) List all physical volumes - This option is correct because lspv is a command in Linux/Unix systems that lists all the physical volumes (disks or disk partitions) on the system.

Option B) List all physical partitions - This option is incorrect because lspv does not list physical partitions. To list physical partitions, you would use the fdisk or parted command.

Option C) List all logical partitions - This option is incorrect because lspv does not list logical partitions. To list logical partitions, you would use the lvdisplay or lvscan command.

Option D) List PP size - This option is incorrect because lspv does not list the PP (Physical Partition) size. To view the PP size, you would use the lspv -l command.

The correct answer is Option A) List all physical volumes. This option is correct because lspv is a command that lists all the physical volumes on the system.

What is the importance of environment variable PS2?
technology operating systems

  1. Its gets displayed when a command continues to next line.

  2. It is reserved for root user

  3. It is used for defining the default character used to commenting a line for a particular shell.

  4. None of these

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Correct Option: A

The /etc/passwd file does not have write permission for others and group. Still the non root users when use the command 'passwd' are actually updating the /etc/passwd file . How does unix allow this?

technology operating systems

  1. Because of the principle of SUID

  2. Because the passwd command lies in /usr/bin

  3. /etc/passwd is a special file and so it is allowed

  4. None of these

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Correct Option: A

What will happen if I execute a shell script with -x options

technology operating systems

  1. Will only show a preview of the execution and will not actually execute the script

  2. Show verbose messages of the execution and helps in debugging

  3. This is called safe-execution.

  4. None of these

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Correct Option: B

Can I change hostname of my AIX server without reboot?
technology operating systems

  1. Yes, use smitty hostname and reboot is not required

  2. No, We have to change and to make it permanent we have to reboot the server

  3. Depends on the runlevel

  4. None of these

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Correct Option: A

What wil be the output of this command?$ for i in 1 2 3;do echo "$i\c";done; Tell without trying on a server.

technology operating systems

  1. 1c2c3c

  2. 123

  3. 1\c2\c3\c

  4. None of these

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Correct Option: B

I am in a directory /tmp/test. $ pwd /tmp/test Now I deleted this directory from another session and fired the command pwd on the previous session. What will be the output of the pwd command?

technology operating systems

  1. /tmp/test

  2. Directory does not exist

  3. /tmp

  4. None of these

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Correct Option: A

$ i=1 $ j=A $ A1=hello These 3 variables are defined. Which of the following commands will display hello?

technology operating systems

  1. eval echo ${j}${i}

  2. eval echo $${j}${i}

  3. eval echo \$${j}${i}

  4. None of these

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Correct Option: C

$ find . -type f -mtime 1
technology operating systems

  1. List all ordinary files in current directory that have been modified within the last 1 minute

  2. List all ordinary files in current directory that have been modified within the last 1 hour

  3. List all ordinary files in current directory that have been modified within the last 24 hours

  4. List all ordinary files in current directory that have been modified within the last 48 hours

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Correct Option: C

Unlike Windows, in UNIX we cannot create a directory named 'a box' i.e. space is not allowed in UNIX for file and directory naming.
technology operating systems

  1. True

  2. False

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Correct Option: B