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Full Discussion: Display previous days dates in ksh
Top Forums Shell Programming and Scripting Display previous days dates in ksh Post 302879759 by pr5439 on Sunday 15th of December 2013 03:42:48 AM
Old 12-15-2013
Display previous days dates in ksh
---------- Post updated at 03:42 AM ---------- Previous update was at 03:38 AM ----------

Sorry for a duplicate post, my post at the first place could not appear due to some net issue on my machine. Here is what i posted earlier:

Hi, i am using ksh in Solaris, i wanted to assign today's, yesterday's, and day before yesterday's date ( in mm/dd/YYYY format) to a variable in a script. Presently i am using :
Code:
tdate=$( date +"%m/%d/%Y" ) #Today
ydate=$(date +"%m/$(date +"%d" | awk '{ printf ("%02d",($1-1)) }')/%Y") #Yesterday
bydate=$(date +"%m/$(date +"%d" | awk '{ printf ("%02d",($1-2)) }')/%Y") #Day before yesterday

It works fine most of the time until today's date is 1 . Going by above logic, last two day's date would be 0 and -1, which in turn should be 30 and 29 or 31 and 30 based on the month( and a special case for February and leap year ). Presently i am making an exception on those days and making my job manually, but i wish to automate the process all along. Can someone help me to have a more optimized and accurate logic.
Thanks in advance
 

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LEARN ABOUT PLAN9

yesterday

YESTERDAY(1)						      General Commands Manual						      YESTERDAY(1)

NAME

       yesterday - print file names from the dump

SYNOPSIS

       yesterday [ -c ] [ -date ] files ...

DESCRIPTION

       Yesterday prints the names of the files from the most recent dump.  Since dumps are done early in the morning, yesterday's files are really
       in today's dump.  For example, if today is March 17, 1992,

	      yesterday /adm/users

       prints

	      /n/dump/1992/0317/adm/users

       In fact, the implementation is to select the most recent dump in the current year, so the dump selected may not be from today.

       With option -c, yesterday copies the dump file to the current directory.

       The date option selects other day's dumps, with a format of 2, 4, 6, or 8 digits of the form dd, mmdd, yymmdd, or yyyymmdd.

       Yesterday does not guarantee that the string it prints represents an existing file.

EXAMPLES

       Back up to yesterday's MIPS binary of vc:

	      cd /mips/bin
	      yesterday -c vc

       Temporarily back up to March 1's MIPS C library to see if a program runs correctly when loaded with it:

	      bind `{yesterday -0301 /mips/lib/libc.a} /mips/lib/libc.a
	      rm v.out
	      mk
	      v.out

FILES

       /n/dump

SOURCE

       /rc/bin/yesterday

SEE ALSO

       fs(4)

BUGS

       It's hard to use this command without singing.

																      YESTERDAY(1)
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