What does >> accomplish when entered on the command line after a command?
It redirects both Standard Error and Standard Ouput to the same location
. It does not accomplish anything. It redirects Standard Error and Standard Input to the same location.
What is wrong with the command ls etc hosts Listofhostfile?
What is wrong with the following command string ls /etc/hosts >listofhostfile?
Nothing is wrong
. Which of the following is not necessarily generated by every command on the system? Which construct can be used in a shell script to read Standard Input and place it in a variable?
What would be the effect of using the alias command to make?
What would be the effect of using the alias command to make an alias for the date command named cat in honor of your favorite pet? … You did not append the stderr to the Error file, and, as a result,
it was overwritten when the command was run a second time
.
Which command could you use to see a list of all environment and user defined shell variables as well as their current values?
| Term | Definition A shell metacharacter used to pipe Standard Output from one command to the Standard Input of another command. | Term Which command could you use to see a list of all environment and user-defined shell variables as well as their current values? a. ls /var b. env c. set d. echo Definition |
|---|
Which construct can be used in a shell script to read stdin?
Which construct can be used in a shell script to read stdin and place it in a variable? A for construct is
a loop construct
that processes a specified list of objects. As a result, it is executed as long as there are remaining objects to process.
Which which which command?
In computing, which is a command for various operating systems used to identify the location of executables. The command is available in Unix and Unix-like systems, the AROS shell, for FreeDOS and for Microsoft Windows.
How do you Unalia a command?
What you need to do is type the word alias then use the name you
wish to use to execute a command followed by “=” sign and quote the command you wish to alias
. You can then use “wr” shortcut to go to the webroot directory. The problem with that alias is that it will only be available for your current terminal session.
What two commands will display the first or last respectively 10 lines of a file when using default options?
Text Processing Commands
To display the first or last ten lines of a file, use head or tail , respectively.
Which command can be used to repair an XFS filesystem?
You can use
the xfs_repair command
to attempt to repair an XFS file system specified by its device file. The command replays the journal log to fix any inconsistencies that might have resulted from the file system not being cleanly unmounted.
Which command searches for and displays any text contents of a binary file group of answer choices?
| Term ~ metacharacter Definition A metacharacter used to represent a user’s home directory. | Term . Which command searches for and displays any text contents of a binary file? a. text b. strings c. od d. less Definition strings |
|---|
Which command displays all the environment variables defined in the shell?
In Unix and Unix-like systems, the names of environment variables are case-sensitive.
The command env
displays all environment variables and their values. The command printenv can also be used to print a single variable by giving that variable name as the sole argument to the command.
How do I access environment variables?
Right-click the Computer icon and choose Properties, or in Windows Control Panel, choose System. Choose Advanced system settings. On the Advanced tab,
click Environment Variables
. Click New to create a new environment variable.
How can I see environment variables?
- Open the Control Panel.
- Navigate to the following applet: Control PanelSystem and SecuritySystem.
- Click the “Advanced System Settings” link on the left. …
- The Environment Variables window will appear on the screen.
Which command displays the users who are currently logged in to the Linux system?
The w command
shows information about the Linux users currently on the server, and their running processes.
Which command can be used to count the number lines words and characters in a file?
The wc command
stands for “word count” and has a quite simple syntax. It allows you to count the number of lines, words, bytes, and characters in one or multiple text files.
Which of the following enables you to redirect standard output as well as errors to a file?
Which of the following enables you to redirect standard output as well as errors to a file? Explanation : Answer B shows the
correct syntax
. The 2 redirects error messages, and &1 makes sure that the same is done for STDOUT.
