To Remove the lines from the source file itself, use the -i option with sed command. If you dont wish to delete the lines from the original source file you can redirect the output of the sed command to another file.
How do I remove lines from a file?
Use del to delete a line from a file where its position is known {#use-del)
- a_file = open(“sample.txt”, “r”) get list of lines.
- lines = a_file. readlines()
- a_file.
- del lines[1] delete lines.
- new_file = open(“sample.txt”, “w+”) write to file without line.
- for line in lines:
- new_file. write(line)
- new_file.
How do I remove all lines from a file in Linux?
Immediately after opening a file, type “gg” to move the cursor to the first line of the file, assuming it is not already there. Then type dG to delete all the lines or text in it. If Vim is in another mode, for example, insert mode, you can access normal mode by pressing Esc or <C-[> .
How do I remove the first 10 lines in Unix?
How it works :
- -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.
- 1d deletes the first line ( 1 to only act on the first line, d to delete it)
- $d deletes the last line ( $ to only act on the last line, d to delete it)
How do I remove the last 10 lines in Unix?
It’s a little roundabout, but I think it’s easy to follow.
- Count up the number of lines in the main file.
- Subtract the number of lines you want to remove from the count.
- Print out the number of lines you want to keep and store in a temp file.
- Replace the main file with the temp file.
- Remove the temp file.
How do you remove multiple lines in Unix?
Deleting Multiple Lines
- Press the Esc key to go to normal mode.
- Place the cursor on the first line you want to delete.
- Type 5dd and hit Enter to delete the next five lines.
How do I remove the first line in Unix?
Using the sed Command
Removing the first line from an input file using the sed command is pretty straightforward. The sed command in the example above isn’t hard to understand. The parameter ‘1d’ tells the sed command to apply the ‘d’ (delete) action on line number ‘1’.
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 the first 10 lines of a file?
Remove first N lines of a file in place in unix command line
- 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 . – …
- tail is multiple times faster for this task, than sed or awk . (
How do I remove the last line in Unix?
6 Answers
- Use sed -i ‘$d’ <file> to edit file in place. – …
- What would be for deleting the last n lines, where n is any integer number? – …
- @JoshuaSalazar for i in {1..N}; do sed -i ‘$d’ <file>; done dont forget to replace N – ghilesZ Oct 21 ’20 at 13:23.