# How to Iterate over a Range of Numbers in Bash

In the Bash command line interface, the `for`

loop is often used to iterate over a range of numbers. This can be useful in a variety of situations, such as when you want to perform an operation on each item in a sequence or when you want to generate a sequence of numbers for some other purpose.

To iterate over a range of numbers in Bash, you can use the `seq`

command, which generates a sequence of numbers. The basic syntax for the `seq`

command is as follows:

```
seq [OPTION]... FIRST INCREMENT LAST
```

Here, `FIRST`

is the first number in the sequence, `INCREMENT`

is the amount by which each subsequent number in the sequence should be incremented, and `LAST`

is the last number in the sequence.

So, for example, if you wanted to generate a sequence of numbers from 1 to 10 in increments of 1, you would use the following seq command:

```
seq 1 1 10
```

This would generate the following sequence of numbers:

```
1
2
3
4
5
6
7
8
9
10
```

Once you have generated a sequence of numbers using the `seq`

command, you can use the `for`

loop to iterate over the numbers in the sequence. The basic syntax for the `for`

loop is as follows:

```
for VARIABLE in SEQUENCE
do
COMMANDS
done
```

Here, `VARIABLE`

is a placeholder for each item in the `SEQUENCE`

, `COMMANDS`

are the commands that should be executed for each item in the sequence, and `SEQUENCE`

is the sequence of items over which the `for`

loop should iterate.

We can use the `seq`

and `for`

commands and iterate over a range of numbers. To do so, you would use the `seq`

command to generate the sequence of numbers, and then use the `for`

loop to iterate over the numbers in the sequence:

```
for i in $(seq 1 1 10)
do
COMMANDS
done
```

Here, the `$(seq 1 1 10)`

part of the `for`

loop generates the sequence of numbers from 1 to 10 in increments of 1, and the `for`

loop iterates over the numbers in the sequence, with `i`

being the current number in the sequence at each iteration.

### Conclusion

The `seq`

and `for`

commands in Bash allow for easy iteration over a range of numbers. This is a great tool for automating tasks and working with sequences of numbers in the Bash command line interface. For example, to perform an operation a repeated number of times.

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