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Full Discussion: awk command in hp UNIX subtract 30 days automatically from current date without date illegal option
Operating Systems HP-UX awk command in hp UNIX subtract 30 days automatically from current date without date illegal option Post 303027802 by Don Cragun on Tuesday 25th of December 2018 12:53:11 AM
Old 12-25-2018
If one were to create a sample input file named myname.dat containing:
Code:
2018-12-24'0 days ago
2018-12-17'7 days ago
2018-12-10'14 days ago
2018-12-03'21 days ago
2018-11-26'28 days ago
2018-11-25'29 days ago
2018-11-24'30 days ago
2018-11-23'31 days ago
2018-11-22'32 days ago
2018-11-21'33 days ago
2018-11-20'34 days ago
2018-11-19'35 days ago
2018-11-12'42 days ago
2018-11-05'49 days ago

and one were to create a utility named now-30days from the C source file now-30days.c:
Code:
#include <stdio.h>
#include <time.h>

#define SecondsPerDay ((time_t)24 * 60 * 60)

int main(void) {
	time_t		Target = time(NULL) - 30 * SecondsPerDay;
	char		TargetString[16];
	struct tm	*Target_tm = localtime(&Target);

	strftime(TargetString, sizeof(TargetString), "%Y-%m-%d", Target_tm);
	printf("%s\n", TargetString);
}

using the command:
Code:
make now-30days

and moving the resulting utility into a directory named in your $PATH environment variable, then the awk command:
Code:
awk -v t="$(now-30days)" -F "'" '$1 < t' myname.dat

if run in the directory containing myname.dat might produce the output:
Code:
2018-11-23'31 days ago
2018-11-22'32 days ago
2018-11-21'33 days ago
2018-11-20'34 days ago
2018-11-19'35 days ago
2018-11-12'42 days ago
2018-11-05'49 days ago

if that command were run on December 24, 2018 (like I did here a few minutes ago).

Is this what you were trying to do?

I don't believe there is anything in this that is not available on all UNIX (including HP-UX), BSD, and Linux systems. It should do some error checking on the returns from localtime(), printf(), and strftime(), but this might give you a starting point for whatever you're trying to do.
This User Gave Thanks to Don Cragun For This Post:
MadeInGermany
 

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