Linux Shell Scripting Cookbook by Unknown

Author:Unknown
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

How it works...

In the implementation of head using awk, we print the lines in the input stream having a line number less than or equal to 10. The line number is available using the special variable NR.

In the implementation of the tail command a hashing technique is used. The buffer array index is determined by a hashing function NR % 10, where NR is the variable that contains the Linux number of current execution. $0 is the line in the text variable. Hence % maps all the lines having the same remainder in the hash function to a particular index of an array. In the END{} block, it can iterate through ten index values of an array and print the lines stored in a buffer.

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