IT340 CHAPTER 1

Front

You type a command into bash and pass a long filename to it, but after you enter the command, you receive a File not found error message because of a typo in the filename. How might you proceed? Options: Retype the command, and be sure you type the filename correctly, letter by letter. Retype the command, but press the Tab key after typing a few letters of the long filename to ensure that the filename is entered correctly. Press the Up arrow key, and use bash’s editing features to correct the typo. Any of the above. None of the above.

Back

Any of the above.

Front

Which of the following commands is implemented as an internal command in bash? cat, less, tee, sed, echo

Back

echo

Front

You type echo $PROC, and the computer replies Go away. What does this mean?

Back

You, one of your configuration files, or a program you’ve run has set the $PROC environment variable to Go away.

Front

What does the pwd command accomplish?

Back

It prints the name of the working directory

Front

What is the surest way to run a program (say, myprog) that’s located in the current working directory?

Back

Type ./ followed by the program name: ./myprog.

Front

How does man display information by default on most Linux systems?

Back

using the less pager

Front

You want to store the standard output of the ifconfig command in a text file (file.txt) for future reference, and you want to wipe out any existing data in the file. You do not want to store standard error in this file. How can you accomplish these goals?

Back

ifconfig > file.txt

Front

What is the effect of the following command?
$ myprog &> input.txt

Back

Standard output and standard error from myprog are written to input.txt.

Front

How many commands can you pipe together at once?

Back

>16

Front

You want to run an interactive script, gabby, which produces a lot of output in response to the user’s inputs. To facilitate future study of this script, you want to copy its output to a file. How might you do this? Options: gabby > gabby-out.txt, gabby | tee gabby-out.txt, gabby < gabby-out.txt, gabby &> gabby-out.txt, gabby `gabby-out.txt`

Back

gabby | tee gabby-out.txt