The meaning of Nf,nr in awk

Awk in the meaning of NF and nr, in fact you already know the meaning of NF and nr, NF is a text file in a row (a record) of the number of fields, NR represents the text file of the number of rows (records). It is often used in programming, especially when it comes to data processing. It is recommended that you look at the information about awk programming, which is a very powerful tool.

Look at an example:

1. Cal 9 2003
2. September 2003 # nr=1; nf=2
3. Su Mo Tu We Th Fr Sa # nr=2; Nf=7
4. 1 2 3 4 5 6 # nr=3; Nf=6
5. 7 8 9 Ten # nr=4; Nf=7
6. * * NR=5; Nf=7
7. * NR=6; Nf=7
8. # nr=7; Nf=3

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NR refers to the location (line number) of the record that awk is working on in the file
NF refers to the record that awk is working on contains several fields (fields), which are related to domain separators, which are empty by default
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The meaning of Nf,nr in awk