How do I delete a specific line in Linux?

How do I remove lines from a file?

Use del to delete a line from a file where its position is known {#use-del)

  1. a_file = open(“sample.txt”, “r”) get list of lines.
  2. lines = a_file. readlines()
  3. a_file. close()
  4. del lines[1] delete lines.
  5. new_file = open(“sample.txt”, “w+”) write to file without line.
  6. for line in lines:
  7. new_file. write(line)
  8. new_file. close()

How do I remove an extra line in Unix?

Use the grep command to delete empty lines.

  1. Use the awk command to delete empty lines in the file. …
  2. Use the sed command to delete empty lines in the file. …
  3. Use the grep command to delete empty lines in the file.

28 апр. 2020 г.

How do you delete text in Linux?

How to Remove Files

  1. To delete a single file, use the rm or unlink command followed by the file name: unlink filename rm filename. …
  2. To delete multiple files at once, use the rm command followed by the file names separated by space. …
  3. Use the rm with the -i option to confirm each file before deleting it: rm -i filename(s)

1 сент. 2019 г.

How do I remove the first 10 lines in Unix?

Remove first N lines of a file in place in unix command line

  1. Both sed -i and gawk v4.1 -i -inplace options are basically creating temp file behind the scenes. IMO sed should be the faster than tail and awk . – …
  2. tail is multiple times faster for this task, than sed or awk . ( of course doesn’t fit for this question for real inplace) – thanasisp Sep 22 ’20 at 21:30.

27 июн. 2013 г.

How do I remove the last 10 lines in Unix?

Remove the Last N Lines of a File in Linux

  1. awk.
  2. head.
  3. sed.
  4. tac.
  5. wc.

8 нояб. 2020 г.

How do I delete a line in CMD?

2 Answers. The Escape ( Esc ) key will clear the input line. In addition, pressing Ctrl+C will move the cursor to a new, blank line.

What is the use of awk in Linux?

Awk is a utility that enables a programmer to write tiny but effective programs in the form of statements that define text patterns that are to be searched for in each line of a document and the action that is to be taken when a match is found within a line. Awk is mostly used for pattern scanning and processing.

How do I remove spaces from a file in Linux?

The right tool for the job

  1. tr -d ‘ ‘ < input.txt > no-spaces.txt.
  2. tr -d ‘[:blank:]’ < input.txt > no-spaces.txt.
  3. tr -d ‘[:space:]’ < input.txt > no-spaces.txt.

16 окт. 2014 г.

How do you remove null values in Unix?

A large number of unwanted NUL characters, say one every other byte, indicates that the file is encoded in UTF-16 and that you should use iconv to convert it to UTF-8. If the lines in the file end with rn00 then what works is to delete the n00 then replace the r with n.

How do you delete multiple lines in Linux?

To delete multiple lines at once, prepend the dd command with the number of lines to be deleted.

Deleting Multiple Lines

  1. Press the Esc key to go to normal mode.
  2. Place the cursor on the first line you want to delete.
  3. Type 5dd and hit Enter to delete the next five lines.

19 июл. 2020 г.

What is difference between yank and delete?

Just as dd.… Deletes a line and yw yanks a word,…y( yanks a sentence, y yanks a paragraph and so on.… The y command is just like d in that it puts the text into the buffer.

How do you delete text in Unix?

Deleting Text

  1. These vi commands delete the character, word, or line you indicate. …
  2. To delete one character, position the cursor over the character to be deleted and type x .
  3. To delete one character before (to the left of) the cursor, type X (uppercase).
  4. To delete a word, position the cursor at the beginning of the word and type dw .

How do I remove the first 5 lines in Unix?

  1. 1 move to first line.
  2. 5 select 5 lines.
  3. d delete.
  4. x save and close.

How do I remove the first line in Unix?

To delete a charecter in a line

  1. Delete First two charters in lin sed ‘s/^..//’ file.
  2. Delete last two chrecters in line sed ‘s/..$//’ file.
  3. Delete blank line sed ‘/^$/d’ file.

How do you delete the first and last line in Unix?

How it works :

  1. -i option edit the file itself. You could also remove that option and redirect the output to a new file or another command if you want.
  2. 1d deletes the first line ( 1 to only act on the first line, d to delete it)
  3. $d deletes the last line ( $ to only act on the last line, d to delete it)

11 июн. 2015 г.

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