awk - Read For Learn

What are NR and FNR and what does “NR==FNR” imply?

In awk, FNR refers to the record number (typically the line number) in the current file and NR refers to the total record number. The operator == is a comparison operator, which returns true when the two surrounding operands are equal. This means that the condition NR==FNR is only true for the first file, as FNR resets back to 1 for the first line of … Read more

How can I use “:” as an AWK field separator?

“-F” is a command line argument, not AWK syntax. Try:

How to split a delimited string into an array in awk?

Have you tried:

Using multiple delimiters in awk

The delimiter can be a regular expression. Produces:

How to grep for case insensitive string in a file?

You can use the -i flag which makes your pattern case insensitive: Also, there is no need for cat. grep takes a file with the syntax grep <pattern> <file>. I also used the -F flag to search for a fixed string to avoid escaping the ellipsis.

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