30.What does the 'awk' command do?

The 'awk' command is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators.

Here are the steps of how 'awk' command works:

1. Awk reads from a file line by line. A file is divided into records, and by default, each line is a record. Each line is then split into fields, by default, space is the field separator.

2. Then, 'awk' command executes the action(s) on each line. The action is what 'awk' does with the input it receives. The action could be printing to the console, performing arithmetic operations, etc.

3. Finally, 'awk' command prints out the result on the terminal or output it to a file.

For example, if you have a text file named 'file.txt' and you want to print the first field of each line, you can use the 'awk' command like this:

awk '{print $1}' file.txt

This command will print the first field (or column) of each line in 'file.txt'.