300720221659213186.jpeg

Which command is used to extract specific lines records from a file?

by

Which command is used to extract specific lines records from a file? awk. sed. “head+tail”

How do you get a specific line from a file Linux? 

Using the head and tail commands, we can easily get the first and last parts of a file.
  1. First, we get line 1 to X using the head command: head -n X input.
  2. Then, we pipe the result from the first step to the tail command to get the last line: head -n X input | tail -1.

Which of the following command will extract lines 5 to 10 from the file? The cut command supports a number of options for processing different record formats. For fixed width fields, the -c option is used. This command will extract characters 5 to 10 from each line. For delimiter separated fields, the -d option is used.

How do I get the 10th line from a text file in Unix? 

Type the following head command to display first 10 lines of a file named “bar.txt”:
  1. head -10 bar.txt.
  2. head -20 bar.txt.
  3. sed -n 1,10p /etc/group.
  4. sed -n 1,20p /etc/group.
  5. awk ‘FNR <= 10’ /etc/passwd.
  6. awk ‘FNR <= 20’ /etc/passwd.
  7. perl -ne’1..10 and print’ /etc/passwd.
  8. perl -ne’1..20 and print’ /etc/passwd.

Which command is used to extract specific lines records from a file? – Additional Questions

How do you show lines of text in Linux?

How to Display Specific Lines of a File in Linux Command Line
  1. Display specific lines using head and tail commands. Print a single specific line. Print specific range of lines.
  2. Use SED to display specific lines.
  3. Use AWK to print specific lines from a file.

How do I grep a line in Linux?

To search multiple files with the grep command, insert the filenames you want to search, separated with a space character. The terminal prints the name of every file that contains the matching lines, and the actual lines that include the required string of characters. You can append as many filenames as needed.

How do I display a specific line in a file in Unix?

  1. awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
  2. sed : $>sed -n LINE_NUMBERp file.txt.
  3. head : $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Here LINE_NUMBER is, which line number you want to print. Examples: Print a line from single file. To print 4th line from the file then we will run following commands.

How do I print a 3rd line in Unix?

Take your pick:
  1. # Take the last line of the top three lines.
  2. head -n 3 my. txt | tail -n 1.
  3. # Tell sed to “be quiet”, and print just the third line.
  4. sed -n 3p my. txt.
  5. # Tell sed to delete everything except the third line.
  6. sed ‘3! d’ my.
  7. # Tell awk to print the third input record of the current file.
  8. awk ‘FNR==3 {print}’ my.

How do I show the first 10 lines of a file in Linux?

To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press <Enter>. By default, head shows you the first 10 lines of a file. You can change this by typing head -number filename, where number is the number of lines you want to see.

How do I see the last 10 lines of a file in Linux?

Linux Tail Command Syntax

Tail is a command which prints the last few number of lines (10 lines by default) of a certain file, then terminates. Example 1: By default “tail” prints the last 10 lines of a file, then exits. as you can see, this prints the last 10 lines of /var/log/messages.

How do I get last 20 lines in Linux?

To display last 20 lines of a file linux use the tail command. Displays the last 20 lines. The default is 10 if you leave out the -n option. Displays the last 100 bytes of the file ( without reguard for the lines).

How do I print last 20 lines of a file?

Command used to print last 20 lines of a file:

The command tail -n <filename> is used to print the last line of a file. The command tail -20<filename> is used to print the last 20 lines of a file.

What does TAC do in Linux?

tac command in Linux is used to concatenate and print files in reverse. This command will write each FILE to standard output, the last line first. When no file is specified then this command will read the standard input.

What is the difference between cat and TAC?

Tac is practically the reverse version of cat command (also spelled backwards) which prints each line of a file starting from the bottom line and finishing on the top line to your machine standard output.

How does AWK work in Linux?

awk works on programs that contain rules comprised of patterns and actions. The action is executed on the text that matches the pattern. Patterns are enclosed in curly braces ( {} ). Together, a pattern and an action form a rule.

What is Linux NL command?

The nl command reads the File parameter (standard input by default), numbers the lines in the input, and writes the numbered lines to standard output. In the output, the nl command numbers the lines on the left according to the flags you specify on the command line.

How use CMP Linux?

On many systems, you can open a command window by pressing the Ctrl+Alt+t keys at the same time. You will also find yourself on the command line if you log into a Linux system using a tool like PuTTY. Once you get your command line window, you’ll find yourself sitting at a prompt.

What is PR command in Linux?

The pr command writes the specified file or files to standard output. If you specify the – (minus sign) parameter instead of the File parameter, or if you specify neither, the pr command reads standard input. A heading that contains the page number, date, time, and name of the file separates the output into pages.

What is TTY name?

tty is short of teletype, but popularly known as a terminal it allows you to interact with the system by passing on the data (you input) to the system, and displaying the output produced by the system.

How do I access tty in Linux?

Accessing a TTY
  1. Ctrl+Alt+F1: Returns you to the graphical desktop environment log in screen.
  2. Ctrl+Alt+F2: Returns you to the graphical desktop environment.
  3. Ctrl+Alt+F3: Opens TTY 3.
  4. Ctrl+Alt+F4: Opens TTY 4.
  5. Ctrl+Alt+F5: Opens TTY 5.
  6. Ctrl+Alt+F6: Opens TTY 6.

What is tty or TDD?

Teletypewriters (TTY), Telecommunications Device for the Deaf (TDD) and Text Telephones (TT) are special telecommunications equipment used by people who cannot use a regular telephone due to hearing loss or speech impairment. Conversations are typed on a TTY.