Programs in awk are different from programs in most other languages, because awk programs are data driven (i.e., you describe the data you want to work with and then what to do when you find it). Most other languages are procedural; you have to describe, in great detail, every step the program should take.
4. Reading Input Files - Effective awk Programming, 4th Edition [Book] Chapter 4. Reading Input Files In the typical awk program, awk reads all input either from the standard input (by default, this is the keyboard, but often it is a pipe from another command) or from files whose names you specify on the awk command line.
gawk sets RT to the text matched by RS. After splitting the input into records, awk further splits the records into individual fields, named $1 , $2, and so on. $0 is the whole record, and NF indicates how many fields there are. The default way to split fields is between whitespace characters.
Notice that in advice, the awk program did not have single quotes around it. The quotes are only needed for programs that are provided on the awk command line. (Also, placing the program in a file allows us to use a literal single quote in the program text, instead of the magic ‘ \\47 ’.)
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