Date command 1

[anatazi]

Is there a way to get the date command to display yesterday's day of the week either in numbers[1,7] or words?
Thanks

 

[predamarcel]

in ksh
echo $((`date +"%u"`-1))

in bash
echo $[`date +"%u"`-1]

the idea is that
date +"%u"
gives you the day of the week

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[Annihilannic]

If you are using Linux (and possibly others?) there's also a handy feature that lets you specify how long ago you want the date from:

[tt]date +"%u" --date "1 day ago"[/tt] Annihilannic.

 

[dickiebird]

N.B If it's Sunday (i.e. date +%u gives 0) then -1 will give -1, not 6 (for Saturday).
Just a caveat. Dickie Bird (-)))

 

[predamarcel]

not `-1'

bash:
echo $[(`date +"%u"`-1+7)%7]

ksh:
echo $(((`date +"%u"`-1+7)%7)) __

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[dickiebird]

Nice one, Marcel ! Dickie Bird (-)))

 

[anatazi]

Hi again,
I tried running the echo $[(`date +"%u"`-1+7)%7]

and got syntax error: `(' unexpected
Any ideas why?
Thanks

 

[predamarcel]

what shell do you have?
echo $SHELL __

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[anatazi]

I am using an interactive Bourne shell (sh)

 

[anatazi]

I have just changed it permanently to ksh and it still gives the same error.

 

[predamarcel]

in ksh you have to use:
echo $(((`date +"%u"`-1+7)%7)) __

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[anatazi]

I did, and i still get the same message.syntax error: `(' unexpected
Thanks

 

[jad]

how about

echo $((($(date +"%u") +6)%7))

?

 

[pauljt]

I am putting a script together with the following:

DateFinish=`date '+"20%y/%m/%d 23:59 GMT"'`

which sets DateFinish to todays date in a specific format,
what would the syntax be to set DateFinish to tommorows date?

 

[Annihilannic]

What operating system?

[tt]DateFinish=`date '+"20%y/%m/%d 23:59 GMT"' --date "1 day"`[/tt]

Should do it on Linux or anything with a recent GNU date utility.

Otherwise, perhaps a quick C programme:

[tt]#include <sys/types.h>
#include <time.h>

struct tm *tm_thetime;
time_t thetime;
char cbuf[1024];

int main(void) {
time(&thetime);
tm_thetime = localtime(&thetime);
tm_thetime->tm_mday++;
mktime((struct tm *)&tm_thetime);
strftime(cbuf,1024,&quot;%y/%m/%d&quot;,tm_thetime);
printf(&quot;%s\n&quot;,cbuf);
}[/tt] Annihilannic.

 

[laredo]

And just to give you another option:

TZ=aaa24 date +%u
6

or as alphabetic:

TZ=aaa24 date +%a
Sat
TZ=aaa24 date +%A
Saturday

 

[Annihilannic]

The C programme is shorter in PERL, as usual:

[tt]#!/usr/bin/perl -w
use POSIX;
@now = localtime(time);
$now[3]++; # Increment mday.
mktime(@now); # Sanity check tm structure.
print strftime(&quot;%y/%m/%d\n&quot;,@now);[/tt] Annihilannic.

 

[pauljt]

re: <<I am putting a script together with the following:
DateFinish=`date '+&quot;20%y/%m/%d 23:59 GMT&quot;'`
which sets DateFinish to todays date in a specific format,
what would the syntax be to set DateFinish to tommorows date?>>

ended up using:

DateFinish=`date '+&quot;20%y/%m/'`$((`date +&quot;%d&quot;`+1))`echo &quot; 23:59 GMT&quot;'&quot;`

This works on Solaris 5.8