10-31-2003
You want to stop a command from working on the first of the month. In ksh, one way is:
(($date +%d)!=1)) && command
But next we have another problem: suppose that
find $DIR -type f -mtime +1 -exec rm -f {} \;
runs on the 2nd day of the month. Those files from the last day of the last month will now be deleted. Is that acceptable? I don't know if you want to keep feb 29 files forever, or just give them a one day extention.
By switching to mtime we are looking at when the file was last modified. If you use atime, you are looking at when it was last read. Does reading a file really qualify it for an extention?
Also:
-mtime 0 means files less than 24 hours old
-mtime 1 means files more than 24 but less than 48
-mtime 2 means files more than 48 but less than 72
-mtime +1 means 48 hours or older
And it is how old from when the command was run. It is not midnight to midnight. You need to be precise.
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LEARN ABOUT OPENSOLARIS
cal
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 5.11 1 Feb 1995 cal(1)