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Full Discussion: How to make awk command faster for large amount of data?
Top Forums Shell Programming and Scripting How to make awk command faster for large amount of data? Post 303024158 by jim mcnamara on Monday 1st of October 2018 11:58:18 PM
Old 10-02-2018
The GNU Awk User's Guide: Time Functions

Run the file through awk only.

Learn to use awk time functions. In the BEGIN {} function, convert the start date and the end date to epoch seconds (%s format)- a big sequential number -- seconds since Jan 1 1970.
For each line in the file convert the date to "%s" format, then see if the number is >=start and <=finish epoch seconds.
If it is in the date range print the line.

This will be a few lines of awk.

And I think vgersh is correct - I do not see how your command worked correctly.
 

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LEARN ABOUT FREEBSD

getdate

GETDATE(1)                                                         User Commands                                                        GETDATE(1)

NAME

       getdate - AME

SYNOPSIS

       [-dv][-n dec][-f format] [ra dec sys] itype2otype [date and/or time]

DESCRIPTION

       Convert date and time between various formats

              [-dv][-n dec][-f format] itype2otype @file

              itype: nfd=ISOFITS fd=FITS, dt=yyyy.mmdd, hr=hh:mm:ss, deg=dd:mm:ss

              jd=Julian  Date,  mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD ep=epoch, epj=Julian epoch, epb=Besselian
              epoch lt=local time, ut=UT, ts=seconds since 1950-01-01 now=current time, ang=fractional degrees

              otype: fd=FITS, dt=yyyy.mmdd, jd=Julian Date, mjd=Modified Julian Date

              hjd=Heliocentric Julian Date, mhjd=Modified HJD  hr=hh:mm:ss,  deg=dd:mm:ss,  ang=fractional  degrees  ep=epoch,  epj=Julian  epoch,
              epb=Besselian epoch ts=seconds since 1950-01-01, tsu=Unix sec, tsi=IRAF sec gst=Greenwich Sidereal Time, lst=Local Sidereal Time

              @file: First one or two columns are in itype format ra dec sys:  Need for Heliocentric conversions

       -a: Append date to input file, if there is one

       -d: Print date without time

       -e: Print output as ET/TDT/TT converting from UT

       -f: Format for output number (C printf)

       -h hours: Longitude in hours, west positive

       -l degrees: Longitude in degrees, west positive

       -n: Number of decimal places in sec, epoch, JD

       -t: Print time without date

       -v: Verbose

getdate 3.8.4                                                        June 2012                                                          GETDATE(1)
All times are GMT -4. The time now is 02:51 AM.
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