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 in Linux?

To see the last 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 of lines in the file.

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

Linux tail command syntax

Tail is a command that prints the last number of lines (10 lines by default) of a certain file and then ends. 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 grep the last pattern of a file?

6 responses

  1. Print last occurrence of x (regex): grep file x | tail -1.
  2. Alternatively: tac file | grep -m1 x.
  3. Print the file from the first matching line to the end: awk ‘/ x / {flag = 1}; flag ‘file.
  4. Print file from last matched line to end (prints all lines in case they do not match): tac file | awk ‘! flag; / x / {flag = 1}; ‘| tac.

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How do I grep a line from a file?

The grep command searches the file, looking for matches to the specified pattern. To use it, type grep, then the pattern we are looking for and finally the file name (or files) we are looking for. The output is the three lines in the file that contain the letters “no”.

How do I grep a file in Linux?

How to use the grep command in Linux

  1. Grep command syntax: grep [options] PATTERN [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 you even have options for that. To list files in as few lines as possible, you can use –format = comma to separate file names with commas as in this command: $ ls –format = comma 1, 10, 11, 12, 124, 13, 14 , 15, 16pgs-landscape.

How do you create a file in Linux?

How to create a text file in Linux:

  1. Using touch to create a text file: $ touch NewFile.txt.
  2. Using cat to create a new file: $ cat NewFile.txt. …
  3. Simply using> to create a text file: $> NewFile.txt.
  4. Lastly, we can use any text editor name and then create the file, such as:

What is the use of awk in Linux?

Awk is a utility that allows a programmer to write small but effective programs in the form of declarations that define text patterns to look for on each line of a document and the action to take when a match is found within a document. line. Awk is mainly used for pattern scanning and processing.

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Does Grep support regular expressions?

Grep regular expression

A regular expression or regex is a pattern that matches a set of strings. … GNU grep supports three regex syntax, basic, extended, and Perl-compatible. In its simplest form, when no regular expression type is provided, grep interprets the search patterns as basic regular expressions.

What is the use of the tail command in Linux?

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, it shows the last ten lines of a file. Also, it is used to monitor file changes in real time. It is a complementary command to the main command.

Conclusion

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