Bash Shell Scripting- awk command with action and basic variables

The video tutorial covers the basics of the AWK command, including its syntax and execution without options, patterns, or actions. It explains how to use actions and logic within AWK commands, focusing on printing operations. The tutorial introduces basic variables like $0, $1, NR, NF, and file name, demonstrating their usage in processing files. Advanced usage of these variables is also discussed, providing a comprehensive understanding of AWK's capabilities.

What is the basic syntax structure of an AWK command?

• awk 'pattern {action}' file

• awk {action} 'pattern' file

• awk 'action {pattern}' file

• awk file 'pattern {action}'

What happens when you run an AWK command without specifying any options, patterns, or actions?

• It prints the entire file content.

• It prints the first line of the file.

• It throws an error.

• It performs no action and outputs nothing.

In AWK, what does the action 'print' do?

• Prints a specified message or data.

• Sorts the file content.

• Counts the number of lines.

• Deletes the file content.

What does the AWK variable $0 represent?

• The last field of a line.

• The entire line or record.

• The number of fields in a line.

• The first field of a line.

How can you print the first and third columns of a file using AWK?

• awk '{print $1, $3}' file

• awk '{print $3 $1}' file

• awk '{print $3, $1}' file

• awk '{print $1 $3}' file

What does the AWK variable NR stand for?

• Number of fields in a line.

• Number of records processed.

• Number of lines in the file.

• Number of characters in a line.

How does AWK determine the number of fields in a line?

• Using the NR variable.

• Using the NF variable.

• Using the $0 variable.

• Using the $1 variable.

What is the purpose of the NF variable in AWK?

• To count the number of lines.

• To print the last field.

• To count the number of fields in a line.

• To print the first field.

How can you automatically print the last field of each line using AWK?

• By using $1.

• By using $0.

• By using $NF.

• By using NR.

What information does the 'FILENAME' variable provide in AWK?

• The name of the current file being processed.

• The number of fields in the current line.

• The last field of the current line.

• The number of records processed.