一些Linux命令以及示例。

wget

wget www.xxx.xxx/file.txt
wget www.xxx.xxx/file{000..100}.txt
wget -i urllist.txt

curl

curl -O www.xxx.xxx/file.txt
curl -O www.xxx.xxx/file[000-100].txt

qpdf

qpdf --decrypt infile.pdf outfile.pdf

pdf compress

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dNOPAUSE  -dBATCH -sOutputFile=compress.pdf input.pdf