How do you remove the last line of a file 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.
How do you remove a specific line from a file in Unix?
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 a Windows end of line character in UNIX?
Remove CTRL-M characters from a file in UNIX
- The easiest way is probably to use the stream editor sed to remove the ^M characters. Type this command: % sed -e “s/^M//” filename > newfilename. …
- You can also do it in vi: % vi filename. Inside vi [in ESC mode] type: :%s/^M//g. …
- You can also do it inside Emacs.
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 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’.
How do I remove the first 100 lines in Unix?
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 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 I remove a specific line from a file?
Using a Number to Delete a Line
- Open the file in read mode.
- Read the files contents.
- Open the file in write mode.
- Use a for loop to read each line and write it to the file.
- When we reach the line we want to delete, skip it.
How do I change a line at the end in Linux?
Convert line endings from CR/LF to a single LF: Edit the file with Vim, give the command :set ff=unix and save the file. Recode now should run without errors.