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Full Discussion: Grep file containing dates
The Lounge What is on Your Mind? Grep file containing dates Post 303027588 by jim mcnamara on Wednesday 19th of December 2018 10:47:54 PM
Old 12-19-2018
Most linux distributions have dgrep available - date grep. Primarily, it uses the standard library to convert dates to number of seconds since Jan 1, 1970.
Then dgrep does what grep does with the transformed date - select lines from a file

dgrep linux command man page
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STIME(2)						     Linux Programmer's Manual							  STIME(2)

NAME
stime - set time SYNOPSIS
#include <time.h> int stime(const time_t *t); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): stime(): Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _SVID_SOURCE DESCRIPTION
stime() sets the system's idea of the time and date. The time, pointed to by t, is measured in seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). stime() may be executed only by the superuser. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EFAULT Error in getting information from user space. EPERM The calling process has insufficient privilege. Under Linux, the CAP_SYS_TIME privilege is required. CONFORMING TO
SVr4. SEE ALSO
date(1), settimeofday(2), capabilities(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2016-03-15 STIME(2)
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