ubuntu下工具pdftoppm代替pdfimages转换pdf为jpeg或者png

假设有批量pdf文件，需要转为jpeg文件，按pdf文件名称建立目录，把图片放到目录下，以阿拉伯数字命名。

#!/bin/bash
find . -type f -name \*.pdf |awk -F "/" '{print $2}' > allpdf.lst
for file in `cat allpdf.lst`
do
mkdir ${file%%.pdf};
echo "pdf name is: " $file
echo "mkdir is: " ${file%%.pdf}
pdftoppm -jpeg $file goodluck
#pdfimages -j $file ${file%%.pdf}

rename 's/goodluck-00//' *.jpg
rename 's/goodluck-0//' *.jpg
rename 's/goodluck-//' *.jpg

mv *.jpg ${file%%.pdf}/
done;

# pdftoppm -h
pdftoppm version 0.62.0
Copyright 2005-2017 The Poppler Developers - http://poppler.freedesktop.org
Copyright 1996-2011 Glyph & Cog, LLC
Usage: pdftoppm [options] [PDF-file [PPM-file-prefix]]
-f <int> : first page to print
-l <int> : last page to print
-o : print only odd pages
-e : print only even pages
-singlefile : write only the first page and do not add digits
-r <fp> : resolution, in DPI (default is 150)
-rx <fp> : X resolution, in DPI (default is 150)
-ry <fp> : Y resolution, in DPI (default is 150)
-scale-to <int> : scales each page to fit within scale-to*scale-to pixel box
-scale-to-x <int> : scales each page horizontally to fit in scale-to-x pixels
-scale-to-y <int> : scales each page vertically to fit in scale-to-y pixels
-x <int> : x-coordinate of the crop area top left corner
-y <int> : y-coordinate of the crop area top left corner
-W <int> : width of crop area in pixels (default is 0)
-H <int> : height of crop area in pixels (default is 0)
-sz <int> : size of crop square in pixels (sets W and H)
-cropbox : use the crop box rather than media box
-mono : generate a monochrome PBM file
-gray : generate a grayscale PGM file
-png : generate a PNG file
-jpeg : generate a JPEG file
-jpegopt <string> : jpeg options, with format <opt1>=<val1>[,<optN>=<valN>]*
-tiff : generate a TIFF file
-tiffcompression <string>: set TIFF compression: none, packbits, jpeg, lzw, deflate
-freetype <string> : enable FreeType font rasterizer: yes, no
-thinlinemode <string> : set thin line mode: none, solid, shape. Default: none
-aa <string> : enable font anti-aliasing: yes, no
-aaVector <string> : enable vector anti-aliasing: yes, no
-opw <string> : owner password (for encrypted files)
-upw <string> : user password (for encrypted files)
-q : don't print any messages or errors
-v : print copyright and version info
-h : print usage information
-help : print usage information
--help : print usage information
-? : print usage information