Frequent question: How do I grep the last line of a file in Linux?

Frequent question: How do I grep the last line of a file in Linux?

How do you find the last line of a file on Linux?

To look at the last lines of a file, use the tail command. tail works the same as head: type tail and the filename to display the last 10 lines of this file, or type tail -number filename to display the last lines of the file.

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

Linux tail command syntax

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

How do I capture the last sample of a file?

6 answers

  1. Print the last occurrence of x (regex): grep x file | Tail -1.
  2. Alternatively: tac file | grep -m1x.
  3. Output the file from the first matching line to the end: awk ‘/ x / {flag = 1}; flag ‘file.
  4. Print file from the last matching line to the end (prints all lines if there is no match): tac-file | awk ‘! Flag; / x / {flag = 1}; ‘ | tac.

How do I capture a line from a file?

The grep command searches the file and searches for matches to the specified pattern. To use it, type grep, then the pattern you were looking for, and finally the name of the file (or files) in which we are looking. The output is the three lines in the file that contain the letters ‘not’.

How can I grep a file on Linux?

How to use the grep command on Linux

  1. Grep command syntax: grep [options] SAMPLE [FILE…] …
  2. Examples of using grep
  3. grep foo / file / name. …
  4. grep -i “foo” / file / name. …
  5. grep ‘Error 123’ / file / name. …
  6. grep -r “192.168.1.5” / etc / …
  7. grep -w “foo” / file / name. …
  8. egrep -w ‘word1 | word2’ / file / name.

How do I list the first 10 files in Linux?

the ls command even has options for that. To list files in as few lines as possible, you can use –format = comma to separate filenames with commas, like in this command: $ ls –format = comma 1, 10, 11, 12, 124, 13, 14, 15, 16pgs landscape format.

How do you create a file on Linux?

To create a text file on Linux:

  1. To create a text file using Touch: $ Touch NewFile.txt.
  2. Create a new file with cat: $ cat NewFile.txt. …
  3. Just use> to create a text file: $> NewFile.txt.
  4. Finally, we can use any text editor name and then create the file, such as:

What is awk for on Linux?

Awk is a utility that enables a programmer to write tiny but effective programs in the form of instructions that define patterns of text to look for on each line of a document and the action to take when a match is found is found within a line. Awk is mostly used for Scan and edit samples.

Does grep support regex?

Regular grep expression

A regular expression or regex is a pattern that matches a series of strings. … GNU grep supports three regular expression syntaxes: Basic, Extended, and Perl Compatible. In its simplest form, grep interprets search patterns as simple regular expressions if no regular expression type is specified.

What is the use of the tail command in Linux?

The Linux tail command is used to display the last ten lines of one or more files. Its main purpose is to read the error message. By default, the last ten lines of a file are displayed. In addition, it is used to monitor the file changes in real time. It is a supplementary command to the head command.

Conclusion

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