Question

我尝试从脚本或cronjob启动一个名为ocrmypdf的python程序。

它可以从终端完美运行，

pi@piscan:~ $ ocrmypdf 
usage: ocrmypdf [-h] [--verbose [VERBOSE]] [--version] [-L FILE] [-j N] [-n]
            [--flowchart FILE] [-l LANGUAGE] [--title TITLE]
            [--author AUTHOR] [--subject SUBJECT] [--keywords KEYWORDS]
            [-d] [-c] [-i] [--oversample DPI] [-f] [-s]
            [--skip-big MPixels] [--tesseract-config TESSERACT_CONFIG]
            [--pdf-renderer {auto,tesseract,hocr}]
            [--tesseract-timeout TESSERACT_TIMEOUT] [-k] [-g]
            input_file output_file
ocrmypdf: error: the following arguments are required: input_file, output_file

但是由于我不理解的原因，它会从另一个shell中断。

pi@piscan:~ $ sh ocrmypdf
sh: 0: Can't open ocrmypdf
pi@piscan:~ $ which ocrmypdf 
/usr/local/bin/ocrmypdf
pi@piscan:~ $ sh $(which ocrmypdf)
import: unable to open X server `' @ error/import.c/ImportImageCommand/364.
import: unable to open X server `' @ error/import.c/ImportImageCommand/364.
from: can't read /var/mail/ocrmypdf.main
/usr/local/bin/ocrmypdf: 10: /usr/local/bin/ocrmypdf: Syntax error: "(" unexpected (expecting "then")

这是执行的代码：

pi@piscan:~ $ cat $(which ocrmypdf)
#!/usr/bin/python3

# -*- coding: utf-8 -*-
import re
import sys

from ocrmypdf.main import run_pipeline

if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
    sys.exit(run_pipeline())

Answer 1

当您输入sh ocrmypdf时，您要求sh shell（可能/bin/sh通常是/bin/bash或/bin/dash的符号链接）来解释ocrmypdf 1}}文件是 Python 脚本，而不是shell脚本。

因此，运行python ocrmypdf或python $(which ocrmypdf)或使ocrmypdf脚本可执行。然后（至少在Linux上）execve(2)将start the python interpreter，因为shebang。

当然，ocrmypdf脚本应位于PATH

中

crontab作业未在桌面环境中运行。因此，如果您使用的话，他们无法访问您的X11服务器Xorg（或Wayland。您可以为此明确设置DISPLAY变量，但我不建议这样做。

无法通过sh / crontab启动python程序

1 个答案: