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Full Discussion: Getting Proper Date Format in SH Script
Top Forums Shell Programming and Scripting Getting Proper Date Format in SH Script Post 302492774 by kooshi on Tuesday 1st of February 2011 12:10:39 PM
Old 02-01-2011
Getting Proper Date Format in SH Script
There's a small SH script I'm trying to write where it will get the current month and find a log file that is based on the date.
Example: Today is February, so the log file is going to be 201102.log (2011 + 02)
An additional thing is that if today is the 1st of a month, it will also find the log file of the previous month.
In the example's case, the previous month's log file is 201101.log.

However, when I run my script, the previous month's log file that the script tries to look for is 20111.log, which obviously ends up failing.
What's the extra bit of code I need to make it look for 201101.log?
The script works fine if the previous month is Oct, Nov, or Dec as this has already been tested.

Code:
DATE_CMD=date

# SET DEBUG to 1 to printout debug data
DEBUG=0
# SET DEBUG_NO_ACTION to 1 to prevent file transfer and update actions
DEBUG_NO_ACTION=0


if [ ${DEBUG_NO_ACTION} == 1 ]; then
   echo WARNING: DEBUG_NO_ACTION set to 1, no file xfer or update will occur
fi

CURDAY=`eval ${DATE_CMD} '+%d'`
if [ ${DEBUG} == 1 ]; then
  echo CURDAY: $CURDAY
fi
if [ "$CURDAY" == "01" ]; then
    CURYEAR=`eval ${DATE_CMD} '+%Y'`
    CURMONTH=$((`eval ${DATE_CMD} '+%m'` - 1))
    
    if  [ "$CURMONTH" == "0" ]; then
        CURYEAR=$((`eval ${DATE_CMD} '+%Y'` - 1))
        CURMONTH=12
    fi
    
    FILENAME=$CURYEAR$CURMONTH.log
        if [ ${DEBUG} == 1 ]; then
          echo PREVIOUS MONTH FILENAME: $FILENAME
        fi
fi

 

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LEARN ABOUT OPENDARWIN

sa2

sa2(8)							    BSD System Manager's Manual 						    sa2(8)

NAME

     sa2 -- Generate a system activity daily report file.

SYNOPSIS

     /usr/lib/sa/sa2 [-dgpu] [-n mode] [-e time] [-f filename] [-i seconds] [-s time]

DESCRIPTION

     The sa2 command is a shell script used to invoke the system activity reporter sar for purposes of generating the standard default daily
     report file.  The report file generated is, /var/log/sa/sardd where the dd represents the current day of the month.  The sa2 options are the
     same as those documented in sar(1).

     When sa2 runs, it will also remove data and report files, found in /var/log/sa, that are more than one week old.

     The sa2 command is intended to be started by cron.

EXAMPLE CRON ENTRY

     # Starting at 8am collect system activity records
     # every 20 minutes for 12 hours
     # 20 minutes = 1200 seconds
     # 12 hours with 3 samples each hour = 36 loops

     0 8 * * 1-5 /usr/lib/sa/sa1 1200 36

     # After the 12 hour period,
     # collect a system activity report

     30 20 * * 1-5 /usr/lib/sa/sa2 -A

FILES

     /var/log/sa/sardd	Default daily report file.
     /var/log/sa/sadd	Default daily data file.

			dd are digits that represent the day of the month.

SEE ALSO

     sa1(8), sadc(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1), crontab(1), crontab(5)

Mac OS X							    Jul 25 2003 							  Mac OS X
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