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Shell Programming and Scripting

how to get 3rd week of every friday?

 
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# 4  
Old 08-22-2012
This should work on most flavours of UNIX depending on how standard the output of cal is.

I've tested it with cal formats like:
Code:
     August 2012    
Su Mo Tu We Th Fr Sa
          1  2  3  4
 5  6  7  8  9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31

Code:
        August 2012       
Sun Mon Tue Wed Thu Fri Sat  
             1   2   3   4
 5   6   7   8   9  10  11
12  13  14  15  16  17  18
19  20  21  22  23  24  25
26  27  28  29  30  31

Anyway it should give you a good start.

Code:
today=$(date +%d)
tf=$(cal | awk '/^S/{s=index($0,"Fr")} substr($0,s,2)~/[ 1-2][0-9]/{i++} i==3{print substr($0,s,2)}')
if [ "$today" = "$tf" ]
then
    echo "It's the 3rd Friday today"
else
    echo "Today is $today and 3rd Friday is $tf"
fi


If your date command supports -d you could use:

Code:
today=$(date +%d)
month=$(date -d $(date +%m)/01/$(date +%Y) +%m/%d/%Y)
tf=$(date -d "$month +$(( 20 - ( $(date -d $month +%u) +1)%7))days" +%d)
 
if [ "$today" = "$tf" ]
then
    echo "It's the 3rd Friday today"
else
    echo "Today is $today and 3rd Friday is $tf"
fi

Last edited by Chubler_XL; 08-23-2012 at 12:13 AM..
These 2 Users Gave Thanks to Chubler_XL For This Post:
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