Answer Posted / arvind kumar

Sudo -U Postgres psql Database_name;
It will prompt you for password give correct password and
you can access the given database if it exist.

What command is used to check the current users?

780

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Give the command for finding the current date.

756

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Differentiate cmp command from diff command.

792

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Explain the terms ‘system calls’ and ‘library functions’ with respect to unix commands?

888

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Explain the steps that a shell follows while processing a command.

906

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What are the unix commands?

744

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What is the use of the command 'ls -x chapter[1-5]' ?

888

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What is the use of the tee command?

804

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Explain command to display different lines that are found when compare two files?

880

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How can we use grep command in unix?

829

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How do I use nslookup?

754

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What are the differences among a system call, a library function, and a unix command?

792

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What do chgrp command do?

818

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What is the use of find command in unix?

751

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What does the command '$ls | wc –l > file1' do?

893

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