Epoch to specific output

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Epoch to specific output by Utilitarian (Vicar) on Jan 02, 2014 at 16:45 UTC
Something like the following (substituting your epoch value for `time()` ) `$ perl -MPosix -E 'say POSIX::strftime("%m%d%H%M",localtime(time()))' 01021644` [download] `print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."`	[reply] [d/l] [select]
Re^2: Epoch to specific output by Anonymous Monk on Jan 02, 2014 at 16:58 UTC
Thank you for the swift reply. The system that I am using does not have the Posix module installed. Is there a way to do this without that option?	[reply]
Re^3: Epoch to specific output by toolic (Bishop) on Jan 02, 2014 at 17:01 UTC
Use upper case: POSIX is a Core module installed with Perl. `perl -MPOSIX -E 'say POSIX::strftime("%m%d%H%M",localtime(time()))'` [download]	[reply] [d/l]
Re^4: Epoch to specific output by Anonymous Monk on Jan 02, 2014 at 18:19 UTC
Re^5: Epoch to specific output by toolic (Bishop) on Jan 02, 2014 at 18:39 UTC
Re^3: Epoch to specific output by Utilitarian (Vicar) on Jan 02, 2014 at 17:02 UTC
the POSIX module has been core since God was a boy, what version/environment are you on? `print "Good ",qw(night morning afternoon evening)[(localtime)[2]/6]," fellow monks."`	[reply] [d/l]
Re: Epoch to specific output by atcroft (Abbot) on Jan 02, 2014 at 18:07 UTC
This seems to do what you are asking, at least for my first test: `perl -MPOSIX -e 'my $t = time; print strftime("%m%d%H%M", gmtime $t);'` [download] You could use localtime in place of gmtime, but then you would have to consider what you want to occur when there are DST (daylight saving time) changes. Hope that helps.	[reply] [d/l]
Re^2: Epoch to specific output by Anonymous Monk on Jan 02, 2014 at 18:47 UTC
Your suggestion works well with a direct input for time. However, I was unable to substitute time with the $x variable. I was able to get it to work though with the following code: `echo $x\|perl -MPOSIX -e 'print strftime("%m%d%H%M", gmtime <stdin>)'` Thank you everyone for your help!	[reply] [d/l]
Re^3: Epoch to specific output by aitap (Curate) on Jan 02, 2014 at 21:01 UTC
Pass your variable as an additional argument, use @ARGV to get it from inside the program: `perl -MPOSIX -le'print strftime("%m%d%H%M", gmtime $ARGV[0])' "$x"` [download]	[reply] [d/l]
Re^4: Epoch to specific output by choroba (Cardinal) on Jan 02, 2014 at 21:31 UTC
Re: Epoch to specific output by oiskuu (Hermit) on Jan 02, 2014 at 20:04 UTC
Using bash you say? If gnu tools are available, the gnu date utility can perform said task: $ date +%Y%m%d%H%M -u -d @1388679108 (Prints the UTC stamp for given epoch time.)	[reply]
Re^2: Epoch to specific output by Anonymous Monk on Jan 02, 2014 at 21:53 UTC
Not to say that non-GNU versions of `date(1)` perform any worse: `% date -ur 1388679108 +%m%d%H%M 01021611` [download] That syntax ought to work on all of the four major BSDs.	[reply] [d/l] [select]
Re: Epoch to specific output by kcott (Archbishop) on Jan 03, 2014 at 04:21 UTC
The core Time::Piece module does what you're after: `$ x=1388679108 \ > perl -MTime::Piece -e 'print gmtime($ENV{x})->strftime("%m%d%H%M")' 01021611` [download] -- Ken	[reply] [d/l]