The easiest option to execute list of command is to use `xargs`. `xargs` reads arguments from **stdin** and use them as argument for a command. In UNIX systems the command `echo` send string of character into **stdout**. We are going to use this command to learn more about `xargs`.
The easiest option to execute list of command is to use `xargs`. `xargs` reads arguments from **stdin** and use them as arguments for a command. In UNIX systems the command `echo` send string of character into **stdout**. We are going to use this command to learn more about `xargs`.
```sh
echo "hello world"
...
...
@@ -148,7 +148,7 @@ There are also some predefined variables that you can use like.
- `$0` Correspond to all the columns.
- `FS` the field separator used
- `NF` the number of fields separated by `FS`
- `NR` the number for records already read
- `NR` the number of records already read
A `awk` program is a chain of commands with the form `motif { action }`
