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Full Discussion: Month Substitution
Top Forums Shell Programming and Scripting Month Substitution Post 302426400 by methyl on Tuesday 1st of June 2010 07:46:00 PM
Old 06-01-2010
I agree. Manipulating the TZ variable in this manner can only work properly 24/7 in the GMT timezone.

The original command posted does not work because ${yesterday} is not set and evaluates to blank. The command as posted just executes:
Code:
date +%Y%m

If only we knew which Operating System and Shell the O/P has?

Iin general it is usually better to use a 00:01 cron to create a reference file "today" and age the file daily to create "yesterday" and "day-before-yesterday" files. Each file can contain the date in the format required by the reporting process or the reporting process could use the timestamp of the relevant file.
 

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CAL(1)							    BSD General Commands Manual 						    CAL(1)

NAME
cal -- displays a calendar SYNOPSIS
cal [-smjy13] [[month] year] DESCRIPTION
Cal displays a simple calendar. If arguments are not specified, the current month is displayed. The options are as follows: -1 Display single month output. (This is the default.) -3 Display prev/current/next month output. -s Display Sunday as the first day of the week. (This is the default.) -m Display Monday as the first day of the week. -j Display Julian dates (days one-based, numbered from January 1). -y Display a calendar for the current year. A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: ``cal 89'' will not display a calen- dar for 1989. Two parameters denote the month (1 - 12) and year. If no parameters are specified, the current month's calendar is displayed. A year starts on Jan 1. 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. OTHER VERSIONS
Several much more elaborate versions of this program exist, with support for colors, holidays, birthdays, reminders and appointments, etc. For example, try the cal from http://home.sprynet.com/~cbagwell/projects.html or GNU gcal. BSD
June 6, 1993 BSD
All times are GMT -4. The time now is 12:04 PM.
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