Awk Digit Match

Count records matching pattern awk - unix &linux se, So i was told to do last > lastloggedin which creates a file that shows the classes last login since the last system reboot, and now i am asked to write an awk script.
Awk language programming - printing output, Printing output. one of the most common actions is to print, or output, some or all of the input. you use the print statement for simple output..
The gnu awk user’ guide - delorie software, If find is not found, index returns zero. (remember that string indices in awk start at one.) length([string]) this returns the number of characters in string..

Regular expressions sed & awk, Regular expressions sed & awk regular expressions key powerful, efficient, flexible text processing allowing variable information search.

https://www.cs.umsl.edu/~sanjiv/classes/cs2750/lectures/re.pdf
The gnu awk user’ guide, Foreword edition. arnold robbins good friends. introduced 1990 circumstances— favorite programming language, awk..

https://www.gnu.org/software/gawk/manual/gawk.html
[1.0] guided tour awk - greg goebel, [1.0] guided tour awk v1.1.5 / chapter 1 3 / 01 mar 16 / greg goebel * chapter overview awk quick tour ..

https://www.vectorsite.net/tsawk_1.html