@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/}.