Re: Future date

[Greg Wooledge]

On Sun, Jan 24, 2016 at 11:58:27PM +, Val Krem wrote:
> So easy, I am just learning about bash scripting.
> date -d 'next month' +%b%Y
> What would happen in December 2016. Will it give me Jan2017?

Try It And See.

imadev:~$ gdate -d 'December 15, 2016 +1 month'
Sun Jan 15 00:00:00 EST 2017


Just to be clear, the -d 'human readable stuff' option is specific to GNU
date, and won't work on other systems.  Also, the 'human readable stuff'
part is NOT specified.  There is no documentation for what is allowed
there, and what is not.  You have to figure it out by trial and error,
and it may change between versions of GNU date.

Re: Future date

[Dave Rutherford]

On Sun, Jan 24, 2016 at 5:30 PM, Val Krem  wrote:
> I am trying to get a variable that combines the next month(Feb) and
current  year (2016) from the current date
[...]
> temp_date=$(date | awk -F ' ' '{print $2,$6}' | tr  -d ' ')

Wow, that's overkill. You don't need the -F ' ' options to awk, since
that's the default. You don't need tr to remove the space because
awk will happily not print one if you omit the comma.

And you don't need awk in the first place because date will handle
the desired output directly if you just ask it to.

> I got  Jan2016.
> but I want  this "Feb2016" next month and current year. How do I do that?
>
> Well at the end of the year, I will have another problem ( ie., to change
it to next year)

date -d 'next month' +%b%Y

Note, I'm not sure that's robust if you call it on, say, the 31st of the
month
if the next month doesn't have 31 days. It might give you two months from
now.
Read the man page for date for further enlightenment.

Re: Future date

[Val Krem]

Thank you very much! 


So easy, I am just learning about bash scripting.
date -d 'next month' +%b%Y
What would happen in December 2016. Will it give me Jan2017?

Val!


On Sunday, January 24, 2016 5:31 PM, Dave Rutherford  
wrote:



On Sun, Jan 24, 2016 at 5:30 PM, Val Krem  wrote:
> I am trying to get a variable that combines the next month(Feb) and current  
> year (2016) from the current date
[...]
> temp_date=$(date | awk -F ' ' '{print $2,$6}' | tr  -d ' ')


Wow, that's overkill. You don't need the -F ' ' options to awk, since
that's the default. You don't need tr to remove the space because
awk will happily not print one if you omit the comma.

And you don't need awk in the first place because date will handle
the desired output directly if you just ask it to.

> I got  Jan2016.
> but I want  this "Feb2016" next month and current year. How do I do that?
>
> Well at the end of the year, I will have another problem ( ie., to change it 
> to next year)


date -d 'next month' +%b%Y


Note, I'm not sure that's robust if you call it on, say, the 31st of the month
if the next month doesn't have 31 days. It might give you two months from now.
Read the man page for date for further enlightenment.