Shell Scripts to Control Your OS

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1. What is the correct statement about #!/bin/bash

It is a comment which is ignored by the shell

It instructs where the shell interpreter is located

It instructs where to save the results of the program

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2. What is the "incorrect" statement

Encapsulating the variable name with ${} is used to avoid ambiguity

Backslash "\" is used for escape special characters

echo file_$(/bin/date +%Y-%m-%dT%H%M).txt will show always show the same output

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3. What is the right command to count the number of lines of a given file

wc -l test.sql

cat test.sql

wc -l cat test.sql

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4. chmod +x <file> command is used for

execute the given file

set permission to execute the file

check the mode of the file is executable

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5. (Search internet to answer this question) What is the inCSH was developed by Bill Joy in the late 1970s

Bash is a a free software replacement for the "Bourne shell"

CSH was developed by "Bill Joy"

CSH has more features than Bash.

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