Chapter 4 Practice Quiz
-c
this option prevents the touch command from creating a file, if it does not already exist
-r
when deleting a directory with rm, this option is used to recursively delete its files and subdirectories
key
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.
stdout
The paste command normally sends its output to ____.
mv
To move a file, you use the ____ command along with the source file name and destination name.
ls > homedir.list
To redirect the list of the files in a directory to a file called homedir.list, you enter ____.
./myscript
To run the myscript shell script located in the current directory, you should enter: ____.
gt;
can be used with cat to combine the contents of two files
paste
combines files side by side
-name
is an option of the find command
-i
option of the cp command that provides a warning before an existing file with the same name is overwritten
-d
option of the cut command used to indicate that a specific character separates the fields
-u
option of the mv command that overwrites a destination file with the same name, if the source file is newer than the one in the destination
-t
option of the sort command used to indicate that a specific character separates the fields
creates an empty file called accountsfile
The command > accountsfile ____.
raw
Character special files are used by input/output devices for communicating one character at a time, providing what is called ____ data.
True
The command rmdir can be used to delete a directory that is not empty.
-s
The cp ____ option creates a symbolic link or name at the destination rather than a physical file.
sort file1 > file2
If you execute ____, the contents of file1 are sorted and the results are stored in file2.
regular
In UNIX/Linux, text files and binary files are considered to be ____ files.
stdin
System administrators and programmers refer to standard input as ____.
stdout
System administrators and programmers refer to standard output as ____.
awk
The ____ command is used to look for patterns in files.
-mtime n
The ____ option of the find command displays files that have been changed within the last n days.
-mmin n
The ____ option of the find command displays files that have been changed within the last n minutes.
-d
The ____ option of the paste command is used to specify a different separator as a delimiter.
True
UNIX/Linux store data, such as letters, product records, or vendor reports, in flat ASCII files
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.
rmdir
When you no longer need a directory, you can use command ____ to remove it.
rm
When you no longer need a file, you can delete it using the ____ command.
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.
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.
False
When you use the paste command, by default, the pasted results appear in columns separated by commas.
True
You can complete a project using awk that you cannot complete using a combination of paste, cut, sort, and join.
touch
You can use the ____ command to create empty files
2>
You can use the ____ operator to redirect commands or program error messages from the screen to a file.