There is a command called mutool than enables splitting PDF files vertically with this invocation mutool poster -y 2. I would like to run it on every PDF file of a directory.
I tried parallel 'mutool poster -y 2' ::: *.pdf , though that doesn't work since I get only one PDF file. I would like to get each file processed, if possible.
How can I achieve that ? If it isn't possible using GNU parallel, is there another way ?
Give mutool a name for the output file, otherwise it will use the placeholder name out.pdf (which it overwrites):
parallel 'mutool poster -y 2 {} {.}_out.pdf' ::: *.pdf
Synopsis of mutool poster command: mutool poster [options] input.pdf [output.pdf]. After the input filename, the output filename can be given.
parallel replaces the curly brackets with input, as described in the documentation:
If command or the following arguments contain replacement strings (such as {}) every instance will be substituted with the input.
Description of the two replacement forms used above (there are many others):
{} Input line. This replacement string will be replaced by a full line read from the input source.
{.} Input line without extension. This replacement string will be replaced by the input with the extension removed.