ProgrammingThis forum is for all programming questions.
The question does not have to be directly related to Linux and any language is fair game.
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
Oh, one more thing, the format strings for time2str are the same as those described in the strftime manual page.
Personally, I find that there are certain types of feature which are difficult to write in shell scripts and that cause me to switch my language up to a more sophisticated one like Perl. Any sort of detailed date calculations is one of those, as well as things which ae best implemented using associative arrays (hashes in Perl) or which need complex data structures..
No need to go with perl. You can accomplish the same thing with the date command itself, and a bit more clearly as well:
Code:
yesterday_variable=`/bin/date -d '1 day ago'`
I'm not on my box to test right now, but I'm sure you could substitute 'yesterday', 'today - 1 day', 'today - 24 hours', etc. for the original date string.
The date man page gives examples of pre- and post-date date strings.
The date command gives that flexibility too. From the date man page, just use the format specifier. The command becomes:
Code:
yesterday_variable=`/bin/date -d '1 day ago' '+%d-%m-%Y'`
Again, since I'm not on my box at home, I can't test that command. You may have to tweak it a little bit if it doesn't work out-of-the-box. See the date man page for help if you need to modify it.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.