12-14-2012
Can i get the previous/next days date of a selected day
Ok, the title is confusing i know, but it is a weird question.
I have a bash script running on Centos5.8 and want to find a better way to do some date manipulation. What i am trying to do is get 3 days of files (day before, that day, and day after), concatenate the three files and pass them on to the next script. This is easy for days in the same month but if i'm pulling for the first of the month i have to figure out what was the last day of the previous month was. I also have to check each time to see if the target date is the last day of that month. Currently i subtract 1 from the month and do a cal command with it and the year (not even dealing with jan 1 yet), strip out the text and count the remaining to get number of days. I would be so much easier if i could just get previous day and following day of $Target_date. I know i can do it on todays date i just can't find a way to specify the date to manipulate.
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CAL(1) User Commands CAL(1)
NAME
cal - display a calendar
SYNOPSIS
cal [options] [[[day] month] year]
DESCRIPTION
cal displays a simple calendar. If no arguments are specified, the current month is displayed.
OPTIONS
-1, --one
Display single month output. (This is the default.)
-3, --three
Display prev/current/next month output.
-s, --sunday
Display Sunday as the first day of the week.
-m, --monday
Display Monday as the first day of the week.
-j, --julian
Display Julian dates (days one-based, numbered from January 1).
-y, --year
Display a calendar for the current year.
-V, --version
Display version information and exit.
-h, --help
Display help screen and exit.
PARAMETERS
A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: cal 89 will not display a calendar
for 1989.
Two parameters denote the month (1 - 12) and year.
Three parameters denote the day (1-31), month and year, and the day will be highlighted if the calendar is displayed on a terminal. If no
parameters are specified, the current month's calendar is displayed.
A year starts on Jan 1. The first day of the week is determined by the locale.
The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the ref-
ormation (although a few did not recognize it until the early 1900's). Ten days following that date were eliminated by the reformation, so
the calendar for that month is a bit unusual.
HISTORY
A cal command appeared in Version 6 AT&T UNIX.
AVAILABILITY
The cal command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux June 2011 CAL(1)