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@setfilename scrotty.info
@settitle scrotty
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@documentlanguage en
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@dircategory Multimedia
@direntry
* scrotty: (scrotty). Take a screenshot of the framebuffer
@end direntry
@copying
Copyright @copyright{} 2014, 2015 Mattias Andrée
@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts. A copy of the license is included in the section entitled
``GNU Free Documentation License''.
@end quotation
@end copying
@ifnottex
@node Top
@top scrotty -- Take a screenshot of the framebuffer
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@end ifnottex
@titlepage
@title scrotty
@subtitle Take a screenshot of the framebuffer
@author by Mattias Andrée (maandree)
@page
@center `I don't know how to make a screenshot, because I normally use my computer in
@center text-mode. I have @sc{X} and @sc{GNOME} installed, but I use them only occasionally.' --- rms
@vskip 0pt plus 1filll
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@end titlepage
@contents
@menu
* Overview:: Brief overview of @command{scrotty}.
* Invoking:: Invocation of @command{scrotty}.
* strftime:: Syntax support via @code{strftime}.
* GNU Free Documentation License:: Copying and sharing this manual.
@end menu
@node Overview
@chapter Overview
@command{scrotty} is a simple command for taking a screenshot
of your framebuffers. It can be used to take a screenshot of
your @sc{TTY} session, but it cannot take a screenshot of your
@sc{X} session.@footnote{Unless it is for some reason is
rendered on the framebuffer.}
@command{scrotty} is designed after @command{scrot}, but
includes a some improvements. Namely it does not support
delaying the screenshot, selecting image quality or creating
thumbnails, but it has support for adding arbitrary arguments
to @command{convert} (from the ImageMagick project), which
is used to save the image.
@command{scrotty} reads the data stored in the framebuffers,
convert it the @sc{PNM} images and pipes it to @command{convert}
to create @sc{PNG} images.
@node Invoking
@chapter Invoking
@command{scrotty} recognises four options:
@table @option
@item --help
Print usage information and exit.
@item --version
Print program name and version and exit.
@item --copyright
Print copyright information and exit.
@item --raw
Save the images in portable anymap format
(PNM), rather than in Portable Network
Graphics (PNG). If this option is used,
and no arguments for @command{convert}
is specified, @command{convert} will not
be used, and there will be not requirement
to have ImageMagick installed.
PNM images are highly compressable with
@command{bzip2}. Compressed images are comparable
in size with @sc{PNG},@footnote{Usually a few
bytes in difference.} and can in fact be smaller.
@item --exec CMD
Run a command for each saved image.
@end table
In addition to these options, a filename
pattern, that does not start with a dash,
can be added. This filename pattern selects
with what filename the image should be saved.
Further, it is possible add @option{--}
followed by additional options to add when
@command{scrotty} spawns @command{convert}.
Both the @option{--exec} and filename pattern
parameters can take format specifiers that are
expanded by @command{scrotty} when encountered.
There are two types of format specifier.
Characters preceded by a `%' are interpreted
by @code{strftime}. See @ref{strftime} or the
manual for your implemenation of @command{strftime}
for examples. These options may be used to refer
to the current date and time. The second kind are
internal to scrotty and are prefixed by `$' or
`\'. The following specifiers are recognised:
@table @asis
@item `@code{$i}'
Framebuffer index.
@item `@code{$f}'
Image filename/pathname.
Ignored in the filename pattern.
@item `@code{$n}'
Image filename.
Ignored in the filename pattern.
@item `@code{$p}'
Image width multiplied by image height.
@item `@code{$w}'
Image width.
@item `@code{$h}'
Image height.
@item `@code{$$}'
Expands to a literal `$'.
@item `@code{\n}'
Expands to new line.
@item `@code{\\}'
Expands to a literal `\'.
@item `@code{\ }'
Expands to a literal ` '.
@end table
A space that is not prefixed by a backslash in
@option{--exec} is interpreted as an argument
delimiter. This is the case even at the beginning
and end of the string and if a space was the
previous character in the string.
For example,
@command{scrotty `%Y-%m-%d_$wx$h.$i.png` --exec 'cp $f ~/.backups/shots/'}
create a file called something like @file{2014-10-28_1792x1344.0.png}
for your first framebuffer and @file{2014-10-28_1792x1344.1.png} for
your second framebuffer, and copies the saved images to @file{~/.backups/shots/}.
@node strftime
@chapter @code{strftime}
@command{scrotty} uses @code{strftime}, which
implemented by the @sc{C} standard library (the
@sc{GNU} @sc{C} Library for most @sc{GNU}/Linux
user,) for formatting the filename or commands
with information about the current date and time.
If you are using the @sc{GNU} @sc{C} Library,
full documentation is available in
@ref{Formatting Calendar Time, Formatting Calendar Time, Formatting Calendar Time, libc, GNU C Library Application Fundamentals}.
Assuming your have a @sc{POSIX}-compliant
implementation of @code{strftime}, at least the
following formatters are supported:
@table @code
@item %a
The name of weekday in your locale, abbreviated.
For example `Tue'.
@item %A
The name of weekday in your locale. For example
`Tuesday'.
@item %b
@itemx %h
The name of month in your locale, abbreviated.
For example `Dec'.
@item %B
The name of month in your locale. For example
`December.
@item %c
Your locale's representation for the date and
time. For example `Tue 08 Dec 2015 09:40:34 CET'.
@item %C
The ``century'', or more precisely the year
divided by 100 and trucated to an integer.
Between year 2000 and 2099, inclusively, this
will be `20'.
@item %d
The day of the month in two digits. For example,
`08' during 8 of December.
@item %D
Equivalent to @code{%m/%d/%y}. For example
@code{12/08/15} for 8 of December 2015.
Be aware, this not what expect in most of the
World, and its requires specialised sorting
algorithms to be sorted properly. Be also
aware, that this contains forward slashes, which
is used as the file delimiter. This is a poor
idea to use this for the filename. @code{%F}
is a better choice.
@item %e
The day of the month. If only one digit is
required, it is preceded by a space. For
example, ` 8' during 8 of December.
@item %F
Equivalent to @code{%+4Y-%m-%d}. For example
@code{2015-12-08} for 8 of December 2015.
@item %g
The last 2 digits of the week-based year.
@item %G
The week-based year.
@item %H
The hour in 24-hour clock format, 2 digits.
@item %-H
The hour in 24-hour clock format, as few digits as possible.
@item %I
The hour in 12-hour clock format, 2 digits.
@item %-I
The hour in 12-hour clock format, as few digits as possible.
@item %j
The day of the year in 3 digits.
For example @code{342} for 8 of December 2015.
@item %-j
The day of the year in as few digits as possible.
@item %m
The month in 2 digits.
For example @code{12} for 8 of December 2015.
@item %-m
The month in as few digits as possible.
@item %M
The minute in 2 digits.
@item %n
A new line.
@item %p
The locale's repesentation for either ante
meridiem or post meridiem.
@item %r
The time in 12-hour notation. The behaviour
is not completely specified. You will have
to try it out. It will probably include
the second and the timezone.
@item %R
The time, in minute resolution, in 24-hour
notation.@footnote{Yes, this is barely similar to
@code{%r}.}
@item %S
The second, in too digits. Currently leap-seconds
are not supported, and @sc{POSIX} does not specify
that double positive leap-seconds are
possible@footnote{Probably because they are avoided.}.
@item %t
A tab space.
@item %T
Equivalent to @code{%H:%M:%S}.
@item %u
The weekday as a number, starting with Monday as 1.
@item %U
The week number of the year, 2 digits.
The first Sunday of January is the first day of
week 1. Week 0 is possible.
@item %-U
Equivalent to @code{-U}, except in as few digits
as possible.
@item %V
The week number of the year, 2 digits.
IF week containing 1 of January has at least four
days in the new year, it is week 1. Week 0 is
impossible.
@item %-V
Equivalent to @code{-V}, except in as few digits
as possible.
@item %w
The weekday as a number, starting with Sunday as 0.
@item %W
The week number of the year, 2 digits.
The first Monday of January is the first day of
week 1. Week 0 is possible.
@item %-W
Equivalent to @code{-W}, except in as few digits
as possible.
@item %x
The locale's representation of the date. This
may be equivalent or similar to @code{%F} and
thus a poor idea to use, if so.
@item %X
The locale's representation of the time.
@item %y
The last two digits in the year. (And at least two digits.)
@item %Y
The year with as many digits as necessary.
@item %z
The offset of the timezone from UTC. Either
@code{+hhmm} or @code{-hhmm} (starts with a hyphen.)
@item %Z
The name of the timezone, abbreviation.
@item %%
A literal `%'.
@end table
Note, this is not all that @sc{POSIX} specifies,
but it is the basics. @sc{POSIX} does not specify
any support for 6-hour clocks, for Saturday as the
first day of the week (or Tuesay through Friday,) or
Sunday to be represented by 1 or Monday as 0. If you
need any of these, you should look into the
specifications for your @sc{C} standard libraries
implementation of @code{strftime}, which may or may
nor support this.
@node GNU Free Documentation License
@appendix GNU Free Documentation License
@include fdl.texinfo
@bye
