- Awk is executed using
awk 'awk_program' data-file.
- Awk programs follow the form
pattern { action }; pattern { action };.
BEGIN blocks are executed before reading the data files.END blocks are executed after reading the data files.NR is a variable that indicates the number of records (rows) read so far.-F '<separator>' is used to define a field separator for a file.- A space is the default field separator.
FPAT is a regex used to define the pattern for each field.FPAT is specifically defined in Gawk.