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Old 03-15-2008, 12:18 AM   #16
konsolebox
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this command doesn't reset the time right?:
Code:
date +%a -d $1-$2-$3
. i haven't seen that
 
Old 03-15-2008, 01:27 AM   #17
jschiwal
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If you use:
date +%a -d "$day/$month/$year"
This will display the day of the week on that date. I changed the variable names to indicate what they represent.
Code:
day=10 month=12 year=2007
> date +%a -d "$day/$month/$year"
Fri
The computers date & time settings won't be changed.

Your form uses the year for the first variable:

Code:
day=10 month=12 year=2007
jschiwal@hpamd64:~> date +%a -d "$year-$month-$day"
Mon
With this form of date, dates are in alphabetical order.

Last edited by jschiwal; 03-15-2008 at 01:28 AM.
 
Old 03-15-2008, 01:43 AM   #18
konsolebox
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Thanks I know what you mean. In order for the script to work, you'll also need to know what weekday name of a specific date. So I thought of the external date command and looked for it's syntax and I found none and that is why i referred to other functions in php or perl. I should have looked a little bit further in date's options. my mistake again .
 
Old 03-15-2008, 02:22 AM   #19
matthewg42
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Quote:
Originally Posted by konsolebox View Post
this command doesn't reset the time right?:
Code:
date +%a -d $1-$2-$3
. i haven't seen that
No. The -d option just means "use a date/time defined in the argument to this parameter", and the +%a just specifies that the output format is using the %a format string (week day). $1 $2 and $3 are the values of the first three arguments to the function - called the "positional parameters" in shell talk. I wrote the function to expect the year, month and day, so putting them together with hyphens between makes a date which the date program can understand, e.g. if the positional parameters are 2007, 02, and 12, the string passed to the date command would be "2007-02-12".

The date command can be used to set the system date, but only if you use the -s (or --set) option, and have sufficient privileges to do it (i.e. you are root).

You should read the date manual page (enter terminal, type "man date"). Manual pages look a little confusing at first, but they all follow more or less the same format, and once you have a little experience reading them, you will be able to answer this sort of question for ourself with ease, and a lot more quickly than by asking others.

To my mind, the really nice thing about manual pages is that they are arranged like a tabloid news story. The first line tries to encapsulate the general gist of the page (i.e. a one line summary of that the subject of the page is), then there's a short overview description and so o, getting more and more detailed towards the end of the page.

Most manual pages have the same main sections, which are printed in CAPTIALS at the start of a line. If your manual browser is set up as most are, using less as a pager, you can search for a section, like OPTIONS easily, just by hitting / and then typing
Code:
^OPT
.
The ^ means "start of line" in less searches.

Last edited by matthewg42; 03-15-2008 at 02:25 AM.
 
Old 03-15-2008, 02:58 AM   #20
jschiwal
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There is also the info manual which does include examples. It really helps to see an example that has a format argument.
 
Old 03-15-2008, 04:02 AM   #21
konsolebox
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i did read the manual page of date .. i always do that since i'd prefer and find it quicker to do 'man date' than 'date --help' .. i just have not looked good enough though. btw we can also have our own way to look for the days of the week without depending on 'date'.. i know a way to do this and it's not really big.. if i'll have the time.. i'll build the script.. just for fun

Quote:
Originally Posted by jschiwal View Post
There is also the info manual which does include examples. It really helps to see an example that has a format argument.
what is not good in info pages is that they are just similar to manual pages like sed.. so sometimes i don't look at them anymore

Edit:
to make things clearer i just looked at these:
Code:
       date [OPTION]... [+FORMAT]
       date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
and not this:
Code:
       -d, --date=STRING
	      display time described by STRING, not `now'
obviously in the first ones you won't see an immediate info about being able to add a custom date.. adding a custom was what i was looking for.

Last edited by konsolebox; 03-15-2008 at 04:12 AM.
 
Old 03-15-2008, 09:45 AM   #22
hro
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'info date' info is much more complete than 'man date'
 
  


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