UNIX/Linux Exam 2
The line in the script for setting the Bash shell is: ____.
#!/bin/bash
To access the name of the script being executed you have to use positional variable ____.
$0
To access the first argument passed to a function you have to use positional variable ____.
$1
To access the whole list of arguments passed to a function as individual parameters you have to use positional variable ____.
$@
When using the printf function, ____ indicates that the output is to appear in decimal digits.
%d
The ____ option of the diff command ignores blanks that repeat.
-b
The ____ option of the diff command shows lines surrounding the line that differs
-c
The ____ option of the paste command is used to specify a different separator as a delimiter.
-d
The ____ option of the find command displays files that have been changed within the last n minutes.
-mmin n
The ____ operator of the test command, combines two expressions and tests a logical OR relationship between them.
-o
When you use find, it is useful to note that some UNIX versions require the ____ option after the file name to display the names of files.
The cp ____ option creates a symbolic link or name at the destination rather than a physical file.
-s
The ____ option of the uniq command instructs it to generate as output only the lines of the source file that are not duplicated successively.
-u
The ____ option of the grep command displays only lines that do not contain the search pattern.
-v
The ____ option of the diff command is used to display the differences side-by-side in columns.
-y
One way to run a shell script is to make it executable by using the x permission and then typing ____ prior to the script name when you run the script itself.
./
The ____ file is run each time you log in or give the command to set Bash as your current shell, but not when you run a subshell.
.bash_profile
The ____ file runs when you log in using the Bash shell as the default, and each time you start a Bash shell within a Bash shell.
.bashrc
For your own account, the shell that is set up by default is established by the system administrator in the ____ file.
/etc/passwd
You can use the ____ operator to redirect commands or program error messages from the screen to a file.
2>
By default, pr formats the specified files into single-column pages of ____ lines.
66
The ____ shell, when compared to the other shells, has a more powerful programming interface.
Bash
____ variables are used to store information about the setup of the operating system, and after they are set up, you typically do not change them.
Configuration
A popular use of pr is to convert lowercase characters to uppercase characters.
False
In UNIX/Linux, all shells support the same commands and programming statements.
False
Shell scripts can automatically access variables created and assigned on the command line.
False
Shell scripts run more quickly than compiled programs.
False
The command rmdir can be used to delete a directory that is not empty.
False
When using wc, you cannot specify all three options (-l, -w and -c) in the command line at the same time.
False
When you are moving files, using the -o option with the mv command can be a good idea so that you don't unexpectedly overwrite a destination file with the same name.
False
When you use cat to combine two files into a third file, the first line of the output contains the first line of the first file followed by the first line of the second file.
False
You can use the < operator to redirect a command's output from the screen to a file.
False
____ variables are those you create at the command line or in a shell script.
Shell
A .bash_logout file in each Bash user's home directory executes commands when the user logs out.
True
A high-level language is a computer language that uses English-like expressions
True
Moving and renaming a file are essentially the same operation.
True
Pseudocode is a design tool only, and is never processed by the computer.
True
The pipe operator can connect several commands on the same command line
True
The program development cycle begins with creating specifications for a program
True
UNIX/Linux store data, such as letters, product records, or vendor reports, in flat ASCII files.
True
You can complete a project using awk that you cannot complete using a combination of paste, cut, sort, and join.
True
You can use the less command with a directory to view its contents one screen at a time, such as less /sbin.
True
You should omit spaces when you assign a variable without using single or double quotation marks around its value.
True
To append new lines in sed, you must use the ____ command
a\
In a flowchart, a(n) ____ is used to indicate process flow.
arrow
The ____ statement simplifies the selection of a match when you have a list of choices.
case
The ____ command locates identical lines within two identically sorted files.
comm
The command > accountsfile ____.
creates an empty file called accountsfile
To reference a variable, you use a dollar sign ($) in front of it or enclose it in ____.
curly brackets ({ })
In a flowchart, a(n) ____ is used to represent a decision.
diamond
When you assign a value to a variable, you might want to evaluate it by displaying its contents via a(n) ____ operator.
evaluating
By default, each page in the output of pr has a ____-line header, which, by default, contains the current file's name, its last modification date, the current page, and a trailer consisting of blank lines.
five
Wildcard characters are also known as ____ characters.
glob
You use the ____ command to search for a specified pattern in a file, such as a particular word or phrase.
grep
The UNIX/Linux shell acts as a(n) ____ when reading script files.
interpreter
A sorting ____ is a field position within each line
key
The join command is used to associate information in two different files on the basis of a common field or ____ in those files
key
To redirect the list of the files in a directory to a file called homedir.list, you enter ____.
ls > homedir.list
A function name differs from a variable name because a function name is followed by a set of ____.
parentheses
You use the ____ character in script files to mark comments.
pound (#)
The ____ command prints a listing of environment and configuration variables.
printenv
The ____ function within the awk command is used to format output.
printf
In UNIX/Linux, text files and binary files are considered to be ____ files.
regular
When you no longer need a file, you can delete it using the ____ command
rm
A simple way to delete a record using ____ is with the -d (delete) option.
sed
____ is NOT a selection command.
sed
With no options, ____ displays the current listing of Bash environment and shell script variables.
set
If you execute ____, the contents of file1 are sorted and the results are stored in file2.
sort file1 > file2
A program's high-level language statements are stored in a file called the ____ file.
source
System administrators and programmers refer to standard input as ______.
stdin
Each step in the program is represented by a(n) ____ in the flowchart.
symbol
A ____ is a name consisting of letters, numbers, or characters and is used to reference the contents of a variable.
symbolic name
If a source file contains ____ errors, it cannot be converted into an executable file.
syntax
The second step in the program development cycle is ____.
the design process
When you create a script, you should include the command that sets the particular shell to use on ____.
the first line of the script
You can use the ____ command to create empty files.
touch
The ____ command enables you to initialize the terminal display or terminal window, to place text and prompts in desired locations, and to respond to what the user selects from the menu.
tput
The ____ command is useful when you want your shell program to automatically remove any temporary files that are created when the shell script runs.
trap
The ____ command removes duplicate lines from a file.
uniq
The ____ statement continues to loop and execute commands or statements as long as a given condition or set of conditions is true.
while
The .bashrc file is a hidden file contained in ____ directory.
your home
