Tag: operating systems

Questions Related to operating systems

"A user types history command and gets the following output 141 cd .tcs 142 ll tcs.lst 143 pwd 144 vi tcs.lst 145 ll -lrt | awk '{ print $NF }' 146 echo ""Test"" 147 ps -ef | grep lsnr 148 grep a * 149 ls 150 echo $PWD Refering to the scenario above, which one of the following is not a method for recovering the pwd command"

technology operating systems

  1. r 143

  2. fc -e -r p

  3. fc -e 143

  4. r -8

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Correct Option: B

Consider the script "beach.sh" for i in $1; do if (( ${#i} > 4 )); then print -n "#$i " fi done beach.sh "On the beach at night, stands a child with her father" What is the output of this script?
technology operating systems

  1. #On the beach at night, stands a child with her father

  2. #On #the #at #a #with #her

  3. #beac #nigh #stan #chil #fath

  4. #beach #night, #stands #child #father

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Correct Option: D

Which of the following command sets the previously undefined variable x to 40?
technology operating systems

  1. typset x=32+8

  2. set x=32+8

  3. let x=32+8

  4. x=32+8

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Correct Option: C

Consider the script let i=2 while (( i <= ($l - 1) )); do if (( ($l % i ) == 0 )); then print $? break; fi let i=i+1 done What is the program all about and what are the possible outputs
technology operating systems

  1. checks prime number; returns one when not prime and zero when prime

  2. checks prime number; returns none when not prime and zero when prime

  3. checks prime number; returns zero when not prime and one when prime

  4. checks prime number; returns zero when not prime and none when prime

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Correct Option: D

Which one of the following command shows the last 50 commands the user has entered.
technology operating systems

  1. fc -l 50

  2. fc -l -50

  3. history 50

  4. history $$

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Correct Option: B

Which one of the following is the syntax for a pattern that matches the null string or a filename beginning with a or A
technology operating systems

  1. ?([A-a].*)

  2. ?([aA]*)

  3. ?([aA].*)

  4. ?([aA]$)

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Correct Option: B

Consider the following case echo * We know that the output will be the list of all the files in current directory or equivalent to ls output. Which of the following command gives the ouput as * for the above script.
technology operating systems

  1. set -t

  2. set -m

  3. set -f

  4. set -l

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Correct Option: C

#! /bin/ksh for i in 1 2 3 4 ......... 50 # loop from 1 to 50 do let i=i+1 done echo $i What is the output of the above script.
technology operating systems

  1. 2450

  2. 1275

  3. 1225

  4. 2550

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Correct Option: B

Crown margin mode can be done using which command?
technology operating systems

  1. nroff

  2. mm

  3. tbl

  4. fmt

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Correct Option: D

Which key allows to append the script in next line
technology operating systems

  1. back slash

  2. Single quote

  3. full stop (dot)

  4. frontslash

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Correct Option: A