What command can be used to confirm which directory you are in at a command line prompt?

The current working directory is the directory from which you invoke commands in your terminal. The pwd command is used to display the current working directory.

Which command can be used to provide a long listing for each file in a certain directory?

Use the ls command to display the contents of a directory. The ls command writes to standard output the contents of each specified Directory or the name of each specified File, along with any other information you ask for with the flags.

What command can be used to display the last five lines of a text file group of answer choices?

Now, tail command gives last 5 lines of the data and the output goes to the file name list.

What two regular expression characters can be used to match the characters at the beginning or end of a line respectively group answer choices?

Boundary matchers — also known as “anchors” — do not match a character as such, they match a boundary. They match the positions between characters, if you will. The most common anchors are ^ and $ . They match the beginning and end of a line respectively.

Which command should you use to display the content of a file?

You can also use the cat command to display the contents of one or more files on your screen. Combining the cat command with the pg command allows you to read the contents of a file one full screen at a time. You can also display the contents of files by using input and output redirection.

How ls command works in Linux?

The ls command is used to list files or directories in Linux and other Unix-based operating systems. Just like you navigate in your File explorer or Finder with a GUI, the ls command allows you to list all files or directories in the current directory by default, and further interact with them via the command line.

What does regular expression indicate?

A regular expression is an object that describes a pattern of characters. The JavaScript RegExp class represents regular expressions, and both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text.

What are regular expressions also explain meta characters?

Meta characters in regular expressions
Meta characterDescription
[ xyz ]A character set. Matches any one of the enclosed characters. For example, [abc] matches the a in plain.
[^ xyz ]A negative character set. Matches any character that is not enclosed. For example, [^abc] matches the p in plain.

What does meta character do?

A metacharacter is a character that has a special meaning during pattern processing. You use metacharacters in regular expressions to define the search criteria and any text manipulations.
…
Search string metacharacters.
MetacharacterAction
*Match zero, one, or many of the preceding expression.

What does regular expression in JavaScript indicates?

A regular expression is a pattern of characters. The pattern is used to do pattern-matching “search-and-replace” functions on text. In JavaScript, a RegExp Object is a pattern with Properties and Methods.

What does /[ (]* regular expression in JavaScript indicate?

4. What does /[^(]* regular expression indicate? Explanation: The [^…] character class is used to match or draw any one character not between the brackets.

What is regex AZ match?

The regular expression [A-Z][a-z]* matches any sequence of letters that starts with an uppercase letter and is followed by zero or more lowercase letters.

Can JavaScript functions return values?

JavaScript functions can return a single value. To return multiple values from a function, you can pack the return values as elements of an array or as properties of an object.

Is a special character in regex?

Special Regex Characters: These characters have special meaning in regex (to be discussed below): . , + , * , ? , ^ , $ , ( , ) , [ , ] , { , } , | , \ . Escape Sequences (\char): To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ).

What do the \d \w and \s shorthand character classes signify in regular expressions?

Shorthand character classes can be used both inside and outside the square brackets. \s\d matches a whitespace character followed by a digit. [\s\d] matches a single character that is either whitespace or a digit.

What is a za z ]+?

[A-Za-z]+ . In words we could read the regular expression as “one or more occurences of the characters between the brackets literally followed by an @-sign, followed by one or more characters between the brackets, literally followed by a period, and completed by one or more letters from among A-Z and a-z.

What is a ZA Z ]*$ in Java?

Description. The character class [a-zA-Z] matches any character from a to z or A to Z.

What does \\ s+ mean in Java?

Therefore, the regular expression \s matches a single whitespace character, while \s+ will match one or more whitespace characters.

What does the character class \D denote in a regex expression?

\D – matches any character except a digit e.g., a letter. \S – matches any character except a whitespace e.g., a letter. \W – matches any character except a word character e.g., non-Latin letter or space.

What is a word character Java?

JavaObject Oriented ProgrammingProgramming. The English alphabet (both cases) and, digits (0 to 9) are considered as word characters. You can match them using the meta character “\w”.

What is <UNK>N Java?

What does \n mean in Java? This means to insert a new line at this specific point in the text. In the below example, “\n” is used inside the print statement, which indicates that the control is passed to the next line. As a result, the text following “\n” will be printed on the next line.

What is the use of \t in Java?

The Java programming language provides a wrapper class that “wraps” the char in a Character object for this purpose.
…
Escape Sequences.
Escape SequenceDescription
\tInsert a tab in the text at this point.
\bInsert a backspace in the text at this point.