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How do I show the last 50 lines of a file in Linux?

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How do I show the last 50 lines of a file in Linux? To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.

How do I see the last 20 lines of a file 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 did you find the last N lines of log file? The tail command, as the name implies, print the last N number of data of the given input. By default it prints the last 10 lines of the specified files.

How do I find the first 100 lines in Linux? 

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.

How do I show the last 50 lines of a file in Linux? – Additional Questions

How do I print the last 5 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 see the last line of a file in Linux?

To display the last part of the file, we use the tail command in the Linux system. The tail command is used to display the end of a text file or piped data in the Linux operating system. By default, it displays the last 10 lines of its input to the standard output. It is also complementary of the head command.

How do I find the first line of a file in Linux?

To display the first part of the file, we use the head command in the Linux system. The head command is used to display the beginning of a text file or piped data. By default, it displays the first ten lines of the specified files. The tail command is also used to display the ending part of the file.

How do you count lines in Linux?

The wc command is used to find the number of lines, characters, words, and bytes of a file. To find the number of lines using wc, we add the -l option. This will give us the total number of lines and the name of the 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 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 you grep 10 lines after a line?

You can use grep with -A n option to print N lines after matching lines. Using -B n option you can print N lines before matching lines. Using -C n option you can print N lines before and after matching lines.

How do I print a 5th line in Unix?

Below are three great ways to get the nth line of a file in Linux.
  1. head / tail. Simply using the combination of the head and tail commands is probably the easiest approach.
  2. sed. There are a couple of nice ways to do this with sed .
  3. awk. awk has a built in variable NR that keeps track of file/stream row numbers.

How do you find the 10th line in a text file?

Where NUM is the number of the line you want to print; so, for example, sed ’10q;d’ file to print the 10th line of file .

How do I print the 25th line in a file?

amit.bansal07
  1. amit.bansal07. Answered On : May 9th, 2009.
  2. Following command will give the required output.head -25 | tail -1Head will get the first 25 lines, whereas tail will get the last line of the 25 lines (i.e. 25the line).

How do I find Top 10 files in Linux?

Find the Largest Top 10 Files and Directories On a Linux
  1. du command : It estimates file space usage.
  2. sort command : Sort lines of text files or given input data.
  3. head command : Output the first part of files i.e. to display first 10 largest file.
  4. find command : It Searches file on Linux machine.

How do you grep the nth line after a match?

To get the n-th line after each match, we can first use grep -An to find each block with n+1 lines. Next, instead of piping it to grep -v, we pipe it to a command that can print every (n+1)-th line. As the output above shows, we’ve got the 3rd line after each “Performance: BAD” line.

How do I grep multiple values?

How do I grep for multiple patterns?
  1. Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
  2. Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
  3. Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
  4. Another option to grep two strings: grep ‘word1|word2’ input.

How do you grep regex?

grep is one of the most useful and powerful commands in Linux for text processing. grep searches one or more input files for lines that match a regular expression and writes each matching line to standard output.

Special Backslash Expressions.

Expression Description
w Match a word.
s Match a space.

How do you change the nth line in Unix?

  1. Replacing or substituting string : Sed command is mostly used to replace the text in a file.
  2. Replacing the nth occurrence of a pattern in a line : Use the /1, /2 etc flags to replace the first, second occurrence of a pattern in a line.

How do you change lines in Unix?

The most used newline character

The n is a newline character for Unix-based systems; it helps to push the commands that come after it onto a new line.

How do I replace a line in Linux?

Find and replace text within a file using sed command
  1. Use Stream EDitor (sed) as follows:
  2. sed -i ‘s/old-text/new-text/g’ input.
  3. The s is the substitute command of sed for find and replace.
  4. It tells sed to find all occurrences of ‘old-text’ and replace with ‘new-text’ in a file named input.