date as ordinary user date manipulation

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From: "Brian K. White" <brian@aljex.com>
References: <3BE1810A.F33A07F2@yahoo.com> <3BE18982.4653E56B@aplawrence.com> <3BE191C9.C941DAD1@yahoo.com> 
Subject: Re: date
Date: Thu, 01 Nov 2001 20:29:11 GMT


----- Original Message -----
From: "Scott" <skotaylor@yahoo.com>
Newsgroups: comp.unix.sco.misc
Sent: Thursday, November 01, 2001 12:06 PM
Subject: date

> Does anyone know how to find tomorrow's date in SCO OSR5.0.5?
> Must be leap year compliant.
>
> TIA
>
> Scott

gnu date supports syntax like this, I use it for archiving log files by
date, makes it easy to split out everything older than 45 days for instance.

combined with "+%xxx" formatting strings and you can do some nice easy
splitting and grouping using simple math comparisons.


mkdir /vols
cd /vols
ftp ftp2.caldera.com
cd /pub/skunkware/osr5/shellutil/sh-utils
get sh-utils-2.0-VOLS.tar
quit
tar xvf *.tar
rm *.tar
custom
  software
    install new
    from localhost
    media images
    /vols
    install
    ok
  host
    exit

[root@aljex /vols] /usr/local/bin/date
Thu Nov  1 13:41:39 EST 2001
[root@aljex /vols] /usr/local/bin/date --d "1 day"
Fri Nov  2 13:41:43 EST 2001
[root@aljex /vols] /usr/local/bin/date --d "1 day ago"
Wed Oct 31 13:41:46 EST 2001
[root@aljex /vols]

enjoy :)

here's a couple ways I use it...

I combine this with a feature of gnu tar to use bzip2 compression internally
and another feature of gnu tar to "mv" the files into the archive, so I have
a single line of code that does a lot of things at once
# once every morning, take all of a certain group of files and archive them
# and give it a filename with yesterdays day of the week name
# this keeps a constant 7 day history of these text files which get created
and
# uploaded somewhere every 15 minutes throughout the day.
gtar cIf DAT_out_`date -d "1 day ago" +%a`.tar.bz2 --remove-files
${DATUSER}*.txt


# this part of a vsi-fax databes maintenance script I wrote that
# purges all records older than 45 days from the live database
# but keeps them archived in bzip2 compressed csv files
# runs every night. so every night it trims off one days worth of data
# from 45 days ago.

# keep DAYS number of days from cmd line , or default 45
typeset -i DAYS=${1:-45}
# date DAYS days ago in format that matches vsi-fax
CUT=`date -d "${DAYS} days ago" +%Y%m%d%H%M%S`
# get a fax sequence number from the cutoff date
typeset -i SEQ=`vdbtool unload -t "eti>${CUT}" -f seq -F pipe ${DBS}/faxreqs
|sort -n |sed -n 1p`
[...]
# export all records with sequence number below cutoff
vdbtool unload -t "seq<${SEQ}" ${DBS}/${DB} |bzip2 >${DB}-${CUT}.csv.bz2
[...]
# purge the old records from the live database
vfxpurge -o ${DAYS}
[...]

Brian K. White  --  brian@aljex.com  --  http://www.aljex.com/bkw/
+++++[>+++[>+++++>+++++++<<-]<-]>>+.>.+++++.+++++++.-.[>+<---]>++.
filePro BBx  Linux SCO  Prosper/FACTS AutoCAD  #callahans Satriani

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