How do I delete a sed matching line?
To begin with, if you want to delete a line containing the keyword, you would run sed as shown below. Similarly, you could run the sed command with option -n and negated p , (! p) command. To delete lines containing multiple keywords, for example to delete lines with the keyword green or lines with keyword violet.
How do you remove the last 3 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 the last 10 lines in Unix?
Remove the Last N Lines of a File in Linux
- awk.
- head.
- sed.
- tac.
- wc.
How do I delete all lines above VI?
If you want to delete all the lines before the current line, then use “:1,-1d“. For example, if you want to delete lines from line number 5 to all lines before this lines, then use the following method: Bring your cursor to line number 5. Press the “Esc” key and type “:1,-1d”, and then press “Enter”.
How do I remove lines from a file?
To delete a line, we’ll use the sed “d” command. Note that you have to declare which line to delete. Otherwise, sed will delete all the lines.
How do I see the last 5 lines of a file in Linux?
To look at the last few 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 lines of the file.
How do you delete selected text in Linux?
Using the Shift + V Keys. We can select and delete specific texts using the Shift + V keys and then using the dd command.
How do I delete 10 lines in vi editor and undo the changes?
Undo changes in vim / Vi
- Press the Esc key to go back to the normal mode. ESC.
- Type u to undo the last change.
- To undo the two last changes, you would type 2u .
- Press Ctrl-r to redo changes which were undone. In other words, undo the undos. Typically, known as redo.
How do I delete a line in a SED file?
Delete first line or header line The d option in sed command is used to delete a line. The syntax for deleting a line is: > sed ‘Nd’ file Here N indicates Nth line in a file. In the following example, the sed command removes the first line in a file. > sed ‘1d’ file unix fedora debian ubuntu 2. Delete last line or footer line or trailer line
How do I delete the first line in a file?
1. Delete first line or header line The d option in sed command is used to delete a line. The syntax for deleting a line is: Here N indicates Nth line in a file. In the following example, the sed command removes the first line in a file.
How to remove lines other than 2nd 3rd and 4th in sed command?
Here the sed command removes lines other than 2nd, 3rd and 4th. 8. Delete first and last line You can specify the list of lines you want to remove in sed command with semicolon as a delimiter.
How to delete the fourth line from a file?
You have to substitute ‘N’ with the line number and ‘d’ is to delete the line. If you have to delete the fourth line from the file then you have to substitute N=4.