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A good way to learn programming in any language through the example code. In this series, I'll introduce awk scripts such as the use of programs that revolve around the act of squaring the number.
In this fourth part, we will learn to execute commands on the operating system underlying. Specifically, use the Unix sort command to sort a file of numbers of smaller the larger the return current numbers to awk, and print spots.
Here the input file that we use:
[771] -> Tmpfile cat
18
3
23
125
Here is an example Duration:
Tmpfile [774] -> ./square_file2
The square of 3 is: 9
The square of 18 is: 324
The square of 23 is: 529
The square of 125 is: 15625
Here is the script (You must replace bars with slashes):
BEGIN (
if (ARGC
(
printf ( "Usage:% s file \ n" argv [0])
exit 1
)
while (Tri-n "ARGV [1] | getline)
printf ( "The square % d% d \ n ", $ 1, $ 1 ^ 2)
)
Note that in this case, we use a different form of awk "getline" command. In Part 3, we use "getline
Specifically, running the management program in the Unix file whose name was always command line. We use the "n" option to force the type to be numeric. The sort command reads the file and then sends the file contents in good order.
The first use "sort-n" ARGV [1] | getline command is run on the operating system (Unix in this case), and return to the first line of command.
Each new call type "-n" ARGV [1] | getline get the next line of output – up completion of the exit. At that time, no return of the call and the while loop is evaluated as false – Make the output loop.
After each getline command, the variable $ 0 is set to the starting line just read that in the series $ 1 in the first field line, $ 2 = second field, $ 3 = third field, etc.
In this case, the loop body consists of a printf statement which prints the number and its square.
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