How do I remove a few lines in Unix?

How do you remove 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?

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 . (

How do you remove the first 3 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 do I remove the last few lines in Unix?

It’s a little roundabout, but I think it’s easy to follow.

1. Count up the number of lines in the main file.
2. Subtract the number of lines you want to remove from the count.
3. Print out the number of lines you want to keep and store in a temp file.
4. Replace the main file with the temp file.
5. Remove the temp file.

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.

Is a special character in Linux?

The characters <, >, |, and & are four examples of special characters that have particular meanings to the shell. The wildcards we saw earlier in this chapter (*, ?, and […]) are also special characters. Table 1.6 gives the meanings of all special characters within shell command lines only.

How do I remove lines from a file?

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 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 D in sed?

sed. From the sed documentation: d Delete the pattern space; immediately start next cycle.

How do I remove the last 10 lines in Linux?

Remove the Last N Lines of a File in Linux

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

How do I count the number of lines in a file in Linux?

The most easiest way to count the number of lines, words, and characters in text file is to use the Linux command “wc” in terminal. The command “wc” basically means “word count” and with different optional parameters one can use it to count the number of lines, words, and characters in a text file.

What is NR in awk command?

NR is a AWK built-in variable and it denotes number of records being processed. Usage : NR can be used in action block represents number of line being processed and if it is used in END it can print number of lines totally processed. Example : Using NR to print line number in a file using AWK.

How do I print the last 10 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 a line in Word in Linux?

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 delete in Unix?

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)