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Top Forums Shell Programming and Scripting Display month for Previous day Post 302282733 by cfajohnson on Sunday 1st of February 2009 06:21:19 PM
Old 02-01-2009

With GNU date:

Code:
date -d -1day +%B

In any POSIX shell:

Code:
months="December November October September August July June May April March February January December "
eval "$( date "$@" "+month=%B day=%d" )"
day=$(( $day - 1 ))
if [ $day -eq 0 ]
then
  month=${months#*$month }
  month=${month%% *}
fi
printf "%s\n" "$month"

 

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cal(1)								   User Commands							    cal(1)

NAME
cal - display a calendar SYNOPSIS
cal [ [month] year] DESCRIPTION
The cal utility writes a Gregorian calendar to standard output. If the year operand is specified, a calendar for that year is written. If no operands are specified, a calendar for the current month is written. OPERANDS
The following operands are supported: month Specify the month to be displayed, represented as a decimal integer from 1 (January) to 12 (December). The default is the current month. year Specify the year for which the calendar is displayed, represented as a decimal integer from 1 to 9999. The default is the current year. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cal: LANG, LC_ALL, LC_CTYPE, LC_TIME, LC_MESSAGES, and NLSPATH. TZ Determine the timezone used to calculate the value of the current month. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
calendar(1), attributes(5), environ(5), standards(5) NOTES
An unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments. To see this calendar, type: cal 9 1752 The command cal 83 refers to the year 83, not 1983. The year is always considered to start in January. SunOS 5.10 1 Feb 1995 cal(1)
All times are GMT -4. The time now is 01:35 AM.
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