题目内容

In an if statement, the ____ operator is used with a name as argument to check if it exists and is a directory.

A. -e
B. -d
C. -f
D. -s

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Which of the following are correct conditional options that can be used to test for file attributes? Select all answers that apply.

A. -e
B. -z
C. -d
D. -r

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Which of the following statements can be used to compare two strings? Select all answers that apply.

A. if [ $STR1 == $STR2 ] ; then echo match found ; fi
B. if [ $STR1 -eq $STR2 ] ; then echo match found ; fi
C. if [[ $STR1 = $STR2 ]] ; then echo match found ; fi
D. All of the above

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Which are possible correct commands to add two numbers? Select all answers that apply.

A. expr 2 + 3
B. echo expr 2 + 3
C. let x=( 1 + 2 ); echo $x
D. echo (expr(2 + 3))

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What commands are used to write the output of the free command to /tmp/free.out? Select all answers that apply.

A. free >> /tmp/free.out
B. free
C. free > /tmp/free.out
D. free

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In an if statement, the ____ operator is used with a name as argument to check if it exists and is a directory.

A. -e B. -d C. -f D. -s

Which of the following are correct conditional options that can be used to test for file attributes? Select all answers that apply.

Which of the following statements can be used to compare two strings? Select all answers that apply.

Which are possible correct commands to add two numbers? Select all answers that apply.

What commands are used to write the output of the free command to /tmp/free.out? Select all answers that apply.

A. -e
B. -d
C. -f
D. -s