Computer Science · all questions

UNIX
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Q641

What is cron?

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Q642

Which built-in variable is used by the awk to specify the line numbers?

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Q643

POSIX is a set of standards specified for establishing compatibility between operating systems.

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Q644

Which command is used for killing a line?

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Q645

Which option is used with pr command for printing multi-columnar output?

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Q646

Which control unlocks the keyboard?

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Q647

To remove write permission from group and others, which one of the following commands will be used?

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Q648

Which of the following is not a valid option of uname?

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Q649

For moving two level up in the file hierarchy system using cd command once, we separates ( . . ) by which symbol?

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Q650

-t option prints the title on the first page.

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Q651

Character class is used for matching a group of characters enclosed within a pair of . . . . . . . .

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Q652

To find out how efficiently a program a used the system resources, which command is used?

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Q653

The . . . . . . . . allows us to read data from the same file containing the script.

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Q654

The command bg %2 is valid.

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Q655

What does the following command do?

$ chmod ugo +w  file01.txt

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Q656

Which of the following offset is used with lseek system call to set the offset pointer to the end of the file?

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Q657

test statement cannot . . . . . . . .

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Q658

Which of the following command will be used to locate those files that have not been modified for more than a year?

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Q659

What are escape sequences?

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Q660

What is the correct syntax for using sed?

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