# Insert, Update and Delete any Line without opening the file in Linux

How comfortable would that be, if we ever have to **Insert**, **Update**, or **Delete** any line from a file without opening?

A few times, we are in a situation, where we had to get rid of a few lines or Insert a few lines in the file.

For the given purpose, we will be using Linux `sed` command line utility app.

### For Inserting or Updating any Data in a specific line

**Syntax:**

```
sed -i 'Ni CONTENT_HERE' filename
```

here `N` represents line number, `i` represents insert and `CONTENT_HERE` would be your actual content, `filename` will be the filename where you want to insert data

**Example**

```
sed -i '10i WorldOfHacker back in 2010 was one of the largest hacking communities in India and across the world' worldofhacker.txt
```

The above command will insert the `WorldOfHacker back in 2010 was one of the largest hacking communities in India and across the world` text on the 10th line of the `worldofhacker.txt` file.

You can try your own homework for various other lines

### For Deleting any Data in a specific line

**Syntax:**

```
sed `Nd` filename
```

here, `N` represents as usual line number `d` represents the `delete` action and `filename` is your filename where you want to delete the `N` line number.

**Example:**

```
sed '10d' worldofhacker.txt
```

The above command will delete the 10th line from the file `worldofhacker.txt`

### For Deleting any Data in the Last line

**Syntax:**

```
sed `$d` filename
```

here, `$` represents the last line number `d` represents the `delete` action and `filename` is your filename where you want to delete the `N` line number.

**Example:**

```
sed '$d' worldofhacker.txt
```

The above command will delete the last line from the file `worldofhacker.txt`

### For Deleting any Data based on a range of lines

**Syntax:**

```
sed `S,Ed` filename
```

here, `S` represents the first starting line number and `E` represents the last or end line number `d` represents the `delete` action and `filename` is your filename where you want to delete the range of line contents.

**Example:**

```
sed '4,7d' worldofhacker.txt
```

The above command will delete the line from the 4th index up to the 7th index of the file `worldofhacker.txt`

### For Deleting multiple lines from Data

**Syntax:**

```
sed `Nd;Pd;Od;` filename
```

here, `N`, `P`, and `O` represent various line numbers, `d` represents the `delete` action and `filename` is your filename where you want to delete the range of line contents.

**Example:**

```
sed '4d;7d;10d' worldofhacker.txt
```

The above command will delete the line from the 4th index, 7th index, and 10th index of the file `worldofhacker.txt`

### For Deleting multiple ranges of Reverse conditional Data

**Syntax:**

```
sed `N,P!d` filename
```

here, `N`, and `P` represent various line numbers, `!d` represents the `delete` action except for these lines, and `filename` is your filename where you want to delete the range of line contents except `N-P`.

**Example:**

```
sed '4,10d' worldofhacker.txt
```

The above command will delete the other line except for the 4th index to the 10th index of the file `worldofhacker.txt`

Hope this crazy method helps you save time. You can do more about them just do `man sed` and you will find why Linux is Love!