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Full Discussion: countdown to christmas
Top Forums Shell Programming and Scripting countdown to christmas Post 302310053 by kodak on Thursday 23rd of April 2009 02:43:38 PM
Old 04-23-2009
Code:
#!/bin/sh
XMAS=`date -d "Dec 25" +%j`
TODAY=`date +%j`
DAYS=$(($XMAS - $TODAY))
if [[  ! $DAYS =~ ^[0-9+$ ]]; then
        echo There are $DAYS days left until Xmas.
else
        echo Merry Xmas and Happy New year\!
fi

This kind of cheats. If it's a negative number it assumes that it's after christmas and will just print the second line. you could do some more logic to make it return the actual number until the next christmas, but I didn't want to gum it up too much.
 

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LASTLOG(8)						    System Management Commands							LASTLOG(8)

NAME
lastlog - reports the most recent login of all users or of a given user SYNOPSIS
lastlog [options] DESCRIPTION
lastlog formats and prints the contents of the last login log /var/log/lastlog file. The login-name, port, and last login time will be printed. The default (no flags) causes lastlog entries to be printed, sorted by their order in /etc/passwd. OPTIONS
The options which apply to the lastlog command are: -b, --before DAYS Print only lastlog records older than DAYS. -h, --help Display help message and exit. -t, --time DAYS Print the lastlog records more recent than DAYS. -u, --user LOGIN|RANGE Print the lastlog record of the specified user(s). The users can be specified by a login name, a numerical user ID, or a RANGE of users. This RANGE of users can be specified with a min and max values (UID_MIN-UID_MAX), a max value (-UID_MAX), or a min value (UID_MIN-). If the user has never logged in the message ** Never logged in** will be displayed instead of the port and time. Only the entries for the current users of the system will be displayed. Other entries may exist for users that were deleted previously. NOTE
The lastlog file is a database which contains info on the last login of each user. You should not rotate it. It is a sparse file, so its size on the disk is usually much smaller than the one shown by "ls -l" (which can indicate a really big file if you have in passwd users with a high UID). You can display its real size with "ls -s". FILES
/var/log/lastlog Database times of previous user logins. CAVEATS
Large gaps in UID numbers will cause the lastlog program to run longer with no output to the screen (i.e. if in lastlog database there is no entries for users with UID between 170 and 800 lastlog will appear to hang as it processes entries with UIDs 171-799). System Management Commands 06/24/2011 LASTLOG(8)
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