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On the Linux CLI, is there a way to get the number of the week of the month? Maybe there is another way to get this with one simple (like date) command? Let's say that day 1 to 7 is the first week, day 8 to 14 is the second week, and so on.

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How do you define the week of the month? The day number divided by 7 and rounded down? Number of Sundays/Mondays/whatever which have passed? –  mgorven Apr 27 '12 at 5:23
    
lets say from one to 7 day its 1rst week, from 7 to 14 second week, from 14 to 21 third and from 21 to end of the month its fourth week. I know that simple bash script with date nad if is nice solution for this but im wondering if i can di that with one command without doing a script. –  B14D3 Apr 27 '12 at 5:28
    
@B14D3 your "week of month" definition is pretty coarse -- what specifically are you using this for? –  voretaq7 Apr 27 '12 at 5:47
    
For nothing I was reading man for date and that came to my mind (Sometimes I have so silly thoughts). So what will be a better definition ? –  B14D3 Apr 27 '12 at 5:54

4 Answers 4

up vote 9 down vote accepted

The date command can't do this internally, so you need some external arithmetic.

echo $((($(date +%d)-1)/7+1))
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That work fine, but I dont understand why this arithmetic returns integer ? –  B14D3 Apr 27 '12 at 5:50
2  
Bash only does integer arithmetic. –  mgorven Apr 27 '12 at 5:52
    
Wow didn't know that. Thx :D –  B14D3 Apr 27 '12 at 5:56
4  
That's correct -- days 29+ are in the 5th week of the month. –  mgorven Apr 27 '12 at 6:06
2  
Sorry I dont know how to format the comment to look nicer. Anyway, great idea to implement, however if the date is 08 or 09, it will cause error: -bash: (09: value too great for base (error token is "09"). Thats is because if numerical value starts with 0, it will be intepreted as octal number by C language, so 08 09 are invalid. For me, the workaround is to change from %d to %e, %e omits the leading 0: echo $((($(date +%e)-1)/7+1)) –  Shâu Shắc Sep 9 '13 at 3:55

Try this:

d=`date +%d` ; m=`date +%m` ; y=`date +%Y` ; cal $m $y | sed -n "3,$ p" | sed -n "/$d/{=;q;}"
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doesn't look simple for me :D and for today it gives me 5 –  B14D3 Apr 27 '12 at 5:43

If you accept external tools in your quest, try dateutils. It's got the notion of occurrence-within-month dates, i.e. 27 Apr 2012 is the 4th Fri in Apr 2012, which just coincides with your week definition. To get that number use:

dconv 2012-04-27 -f %c
=>
  04

%c (count) is the format specifier for the occurrence-within the month. Or to be even cooler try

dconv today -f '%cth %a in %b %Y'
=>
  1st Wed in Sep 2012
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You can use this:

Monday First week day

WEEKNUMBER=$(( 1 + $(date +%V) - $(date -d "$(date -d "-$(($(date +%d)-1)) days")" +%V) ))

Sunday Firs week daty

WEEKNUMBER=$(( 1 + $(date +%U) - $(date -d "$(date -d "-$(($(date +%d)-1)) days")" +%U) ))
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