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Full Discussion: Get Previous date of a past date
Top Forums Shell Programming and Scripting Get Previous date of a past date Post 302569521 by dude2cool on Monday 31st of October 2011 02:36:00 PM
Old 10-31-2011
Please look here:

https://www.unix.com/answers-frequent...rithmetic.html

I think I remember you asking this question before. Here is the exact shell script, maybe this will help. This is a slight modification of one of the solution from the above post. Credit goes to the original author of the code, I just made slight modification.

Code:
#!/bin/sh
pcontromModate="2008-11-31"
YEAR=`echo $pcontromModate|cut -d "-" -f 1`
MONTH=`echo $pcontromModate|cut -d "-" -f 2`
DAY=`echo $pcontromModate|cut -d "-" -f 3`
DAY=`expr "$DAY" - 1`
case "$DAY" in
        0)
           MONTH=`expr "$MONTH" - 1`
                case "$MONTH" in
                        0)
                           MONTH=12
                           YEAR=`expr "$YEAR" - 1`
                        ;;
                esac
        DAY=`cal $MONTH $YEAR | grep . | fmt -1 | tail -1`
esac
echo "Yesterday was: $MONTH-$DAY-$YEAR"

here is the output from the above:

Code:
# /tmp/45.sh
Yesterday was: 11-30-2008

Last edited by dude2cool; 10-31-2011 at 03:47 PM..
 

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LEARN ABOUT REDHAT

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     Column exits 0 on success, >0 if an error occurred.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME
" 
	   ; ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BSD
								   June 6, 1993 							       BSD
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