We saw how to use data fields such as $1 and $2. Also, we saw the NR field, which holds the number of processed lines, but there are more built-in variables that AWK offers to simplify work more and more.
- FIELDWIDTHS: Specifies the field width
- RS: Specifies the record separator
- FS: Specifies the field separator
- OFS: Specifies the output separator, which is a space by default
- ORS: Specifies the output separator
- FILENAME: Holds the processed file name
- NF: Holds the line being processed
- FNR: Holds the record which is processed
- IGNORECASE: Ignores character case
These variables can help you a lot in many cases. Let's assume that we have the following file:
John Doe
15 back street
(123) 455-3584
Mokhtar Ebrahim
10 Museum street
(456) 352-3541
We can say that we have two records for two persons and each record contains three fields. Let's assume that...
