Tag: operating systems

Questions Related to operating systems

if[ -f filename ]

technology operating systems

  1. checks for the existence of a file

  2. checks for existence of a directory

  3. checks for read permission on a file

  4. checks for write permission on a file

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Correct Option: A

How to display first 10 lines of all files ending with ".txt"?
technology operating systems

  1. cat *.txt -length=10

  2. disp 10 .txt

  3. head -10 *.txt

  4. print 10 *.txt

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Correct Option: C

How do you get help about the command "mv"?
technology operating systems

  1. help mv

  2. man mv

  3. mv ?

  4. mv help

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Correct Option: B

How to search all files in current directory for the word "test"

technology operating systems

  1. grep test *

  2. lookup test *

  3. search test *

  4. dir test .

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Correct Option: A

How to rename "FILE1" to "FILE2" ?
technology operating systems

  1. ren FILE1 FILE2 - i

  2. ren FILE1 FILE2

  3. cp FILE1 FILE2

  4. mv FILE1 FILE2

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Correct Option: D

How to list all files in the current directory?

technology operating systems

  1. dir *

  2. dir .

  3. list all

  4. ls -a

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Correct Option: D

In which system call we have to use file descriptor to identify the file.

technology operating systems

  1. fchmode()

  2. fchmod()

  3. chmod()

  4. All the above.

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Correct Option: B

which command gives the operating system's version number?

technology operating systems

  1. uname -v

  2. uname -p

  3. uname -s

  4. uname -r

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Correct Option: D

Which command is used to create recursive directories.2) mkdir -v x/y x/y/z3) mkdir -p x/y x/y/z4) mkdir x x/y x/y/z
technology operating systems

  1. i and ii

  2. i,ii,iv

  3. iii,iv

  4. All the above.

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Correct Option: C

Which command is used to get the entire line using awk?
technology operating systems

  1. $1

  2. $0

  3. $*

  4. $#

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Correct Option: B