Basic Bash Linux Text

A file begins with #!/bin/sh. This means:

• C Shell compatibility mode is enabled

• Running the script will invoke /bin/sh to interpret the rest of the file

• This is a Perl script

• Nothing, this is a comment

What does this shell script do?

• Nothing, since there is a problem with the conditions in the if statement

• Creates /tmp/foo if it does not exist

• Outputs a message to the screen

• Creates /tmp/foo and raises an error if there is a problem

Which of the following are correct about for and while loops?

Choose Two

• for loops require a variable over which to iterate

• while loops have a test each cycle to determine if it should run again

• while loops operate over a fixed list of items

• for loops operate over a fixed list of items

Given the following part of a script:

What is the meaning of $1?

• t is a special variable that indicates the exit code of the command before it

• It is the first argument passed to the script

• It is a file called $1

• It is a list of files that gets interpolated

Given the following script that is run through ./test.sh hello goodbye:

When will “I am here” be printed?

• If a file called "goodbye" exists in the current directory

• If a file called "hello" exists in the current directory

• The script will always print “I am here”

• Never

What is the correct way to assign the word "Hello" to a variable?

• $A="Hello"

• A = "Hello"

• A="Hello"

• echo $A "Hello"

What is the correct way to save the current directory to a variable?

• A=$(pwd)

• A=pwd

• pwd $A

• pwd | $A

Which shell command accepts input from the user’s keyboard?

• input

• read

• echo

• $1

Given the following script:

Which of the following are true? Choose Two

• If a file called /tmp/foo exists, process_data won’t be run

• process_data will be called at most once

• The screen will fill with dots.

• process_data will never be run

A conditional that lets you make multiple comparisons with a pattern is called:

• branch

• if

• case

• test