question regarding ebook-comversion command line switches

docjc · 02-27-2023, 09:22 AM

Hi,
I'm using the ebook-converter.exe as an external program in a python project and I would like to avoid the cmd output of the program but I don't find any switch to avoid these messages. Is there any switch that surpresses these messages?

Jü

kovidgoyal · 02-27-2023, 10:53 AM

No there isnt. Redirect the command output to null

docjc · 02-28-2023, 04:58 AM

thank you for the quick answer, your hint I already tried with a strange result:
on the w11 command line the following command worked fine:
ebook-convert "file 1.epub " "tmp.epub" >nul
exactly the same command just copied from python program gives the following result:
"Extra arguments not understood: >nul" and no conversion. Strange.

Quoth · 02-28-2023, 06:16 AM

Try > nul (a space)

Also some windows programs output to stderr, so you need 2> nul instead.

docjc · 02-28-2023, 10:25 AM

thanks for your answer, but...
this is the line
subprocess.run("ebook-convert " + "\"file 1.epub\" " + "\"tmp.epub\" " + "> nul")

This is the result:
"Extra arguments not understood: >, nul" (of course no conversion) btw where does to comma come from?
Any hint?

Where does the comma come from???

Sarmat89 · 02-28-2023, 10:34 AM

You need shell=True (or just use subprocess.DEVNULL for the stdout)

chaley · 02-28-2023, 10:46 AM

Quote:

Originally Posted by docjc

thanks for your answer, but...
this is the line
subprocess.run("ebook-convert " + "\"file 1.epub\" " + "\"tmp.epub\" " + "> nul")

This is the result:
"Extra arguments not understood: >, nul" (of course no conversion) btw where does to comma come from?
Any hint?

Where does the comma come from???

subprocess.run() is not a shell. You specify arguments, stdin, stdout, and stdout as separate parameters. See the documentation, and especially the Frequently used arguments section. From what you say I think you want stdout=DEVNULL and stderr=DEVNULL.

IMO: supplying the arguments as a python list is a lot easier than passing them as a string with all the quotes and escaping.

docjc · 02-28-2023, 12:51 PM

@Sarmat89 and Chaley
Thank you very much, now the problem is solved

For a newbee in python as me it is sometimes difficult

Quoth · 02-28-2023, 04:53 PM

Quote:

Originally Posted by docjc

thanks for your answer, but...
this is the line
subprocess.run(

That was a very vital bit of info! Not a regular command line.

02-27-2023, 09:22 AM	#1
docjc Member Posts: 16 Karma: 10 Join Date: Aug 2020 Device: Kobo	question regarding ebook-comversion command line switches Hi, I'm using the ebook-converter.exe as an external program in a python project and I would like to avoid the cmd output of the program but I don't find any switch to avoid these messages. Is there any switch that surpresses these messages? Jü

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02-27-2023, 10:53 AM	#2
kovidgoyal creator of calibre Posts: 45,347 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	No there isnt. Redirect the command output to null

02-28-2023, 04:58 AM	#3
docjc Member Posts: 16 Karma: 10 Join Date: Aug 2020 Device: Kobo	thank you for the quick answer, your hint I already tried with a strange result: on the w11 command line the following command worked fine: ebook-convert "file 1.epub " "tmp.epub" >nul exactly the same command just copied from python program gives the following result: "Extra arguments not understood: >nul" and no conversion. Strange.

02-28-2023, 06:16 AM	#4
Quoth Still reading Posts: 14,025 Karma: 105092227 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	Try > nul (a space) Also some windows programs output to stderr, so you need 2> nul instead.

02-28-2023, 10:25 AM	#5
docjc Member Posts: 16 Karma: 10 Join Date: Aug 2020 Device: Kobo	thanks for your answer, but... this is the line subprocess.run("ebook-convert " + "\"file 1.epub\" " + "\"tmp.epub\" " + "> nul") This is the result: "Extra arguments not understood: >, nul" (of course no conversion) btw where does to comma come from? Any hint? Where does the comma come from???

02-28-2023, 10:34 AM	#6
Sarmat89 Fanatic Posts: 517 Karma: 2268308 Join Date: Nov 2015 Device: none	You need shell=True (or just use subprocess.DEVNULL for the stdout)

02-28-2023, 12:51 PM	#8
docjc Member Posts: 16 Karma: 10 Join Date: Aug 2020 Device: Kobo	@Sarmat89 and Chaley Thank you very much, now the problem is solved For a newbee in python as me it is sometimes difficult

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