Write a note on file permissions on linux, Basic Computer Science

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Question

1 Write a note on advantages and disadvantages of Linux
2 Write a note on "File Permissions" on linux
3 Explain the usage of following Linux commands

Cd
kill

4 Write a short note on the following

bash
ksh

5 Explain the usage of following special characters used in string search

$
^
[]
\<
\>

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