How delete all lines in Linux?

How do I remove all lines from a file in Linux?

Delete all lines in VI / VIM editor – Unix / Linux

1. Go to command mode in the editor by pressing ESC key on the keyboard.
2. Press gg. It will take to the first line of the file.
3. Then press dG. This will delete from the first line to the last line.

How do I delete all line?

Place the text cursor at the beginning of the line of text. On your keyboard, press and hold the left or right Shift key and then press the End key to highlight the entire line. Press the Delete key to delete the line of text.

How do I delete multiple lines in Linux history?

You can use history -d offset builtin to delete a specific line from the current shell’s history, or history -c to clear the whole history. It’s not really practical if you want to remove a range of lines, since it only takes one offset as an argument, but you could wrap it in a function with a loop.

How delete all blank lines in Unix?

Simple solution is by using grep (GNU or BSD) command as below.

1. Remove blank lines (not including lines with spaces). grep . file.txt.
2. Remove completely blank lines (including lines with spaces). grep “S” file.txt.

How do you delete multiple lines in Unix?

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.

How do I remove the first 10 lines 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)

How delete multiple lines in JCL?

To delete one or more lines:

1. Type D in the line command field of the line to be deleted. If you also want to delete one or more lines that immediately follow this line, type a number greater than 1 after the D command.
2. Press Enter. The line or lines are deleted.

How do I delete all content in vi?

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.

How do I delete multiple lines in putty?

> If you use ESC + : + m,$d + ENTER , it will delete all the lines starting from the mth line to the end of file.

How do I permanently delete Linux history?

There may come a time that you want to remove some or all the commands in your history file. If you want to delete a particular command, enter history -d <line number> . To clear the entire contents of the history file, execute history -c .

Can I delete .bash history?

When you have a terminal open, and you issue a command, it writes the command to the history file. So issuing history -c will clear the history from that file.

How do I remove the last line in Unix?

6 Answers

1. Use sed -i ‘$d’ <file> to edit file in place. – …
2. What would be for deleting the last n lines, where n is any integer number? – …
3. @JoshuaSalazar for i in {1..N}; do sed -i ‘$d’ <file>; done dont forget to replace N – ghilesZ Oct 21 ’20 at 13:23.

How do I remove the last blank line in Unix?

Try ${/^$/d;} this will only match an empty line if it is the last line of the file. I tried it with sed (GNU sed) 4.2. 2 and got all blank lines deleted not only the empty line if it is the last line of the file.

How do you grep an empty line?

To match empty lines, use the pattern ‘ ^$ ‘. To match blank lines, use the pattern ‘ ^[[:blank:]]*$ ‘. To match no lines at all, use the command ‘ grep -f /dev/null ‘.