ch. 7: working with Bash shell
true
Can you combine redirection and piping together?
\f
The ____ escape sequence represents a form feed.
wc
The ____ command counts the number of lines, words, and characters in a file.
false
Given the syntax command && command, the command on the left of the && construct is executed only if the command on the right of the && construct completed successfully.
false
When performing a pipe, do you need to have spaces around the | metacharacter?
true
You are limited to using one pipe | metacharacter on the command line to pipe information from one command to another command.
|[ A -gt B ]
The test statement ____ would be used to determine if A is numerically greater than B.
read and execute
If you have ____ permission to a shell script, you can execute the shell script like any other executable program on the system.
colon
Most configuration files on Linux systems are delimited using ____ characters.
2
The file descriptor stderr is represented by the number ____.
0
The file descriptor stdin is represented by the number ____.
env
To see a list of all exported environment and user-defined variables in the shell, you can use the ____ command.
<
You can redirect a file to the standard input of a command using the ____ metacharacter.
|
You can send the standard output of one command to another command as standard input using the ____ shell metacharacter.
true
You can use the sed command to remove unwanted lines of text.
awk
The ____ command can be used to extract, manipulate, and format text using pattern-action statements.
true
Any command that can be executed on the command line can also be placed inside any environment file.
false
To prevent a file from being cleared by the BASH shell and append output to the existing output, you can specify three > metacharacters alongside the file descriptor.
set
To see a list of the environment variables and their current values on a system, you can use the ____ command.
true
When redirecting both standard output and standard error to a file, does using the same filename for both result in a loss of data?