2022.1

It is possible to format the number using a pattern and locale. See
"Formatting date and number values " on page1556, below.
${file.pageCount}
This variable was introduced for use in Printer Definitions for
PostScript printers.
As it entails page buffering and could easily lead to Out of Memory
errors with big jobs, usage of this variable in an Output Preset
or in the Print Wizard is discouraged; it should be regarded as
deprecated.
Job
${job}
${job} is a shorthand for ${job.base}_${job.nr,0000}.${job.ext}. It
expands to a name based on the name of the applied Job Creation
Preset (or 'Untitled' if no Job Creation Preset was used). A four digit
sequence number is added at the end of the base name. The file
extension is determined by the selected output format.
The 0000 in ${job.nr,0000} is a format pattern that takes care of
formatting the number with at least four digits including leading zero's.
See "Formatting date and number values " on page1556, below.
${job.base} or
${job.name}
Returns the name of the applied Job Creation Preset without any
extension.
Expands to Untitled if no Job Creation Preset was used.
${job.nr}
An automatic sequence number belonging to the current output file. It is
automatically incremented for each new output file that gets created.
Note, that multiple output files are created, for example, when output
separation has been selected for output creation.
It is possible to format the number using a pattern and locale. See
"Formatting date and number values " on page1556, below.
${job.ext}
The extension that corresponds to the chosen output format, for example
pdf or ps.
Note that ${job.ext} does not include a leading dot.
Page 1551