Find keywords in pptx files. It will search pptx files recursively from the current working directory.
Descriptions in Japanese are available here.
dmd pptxgrep.d
alias pptxgrep=$PWD/pptxgrep # or put them somewhere in $PATH
$ pptxgrep keyword
Found "keyword" in hoge/hoge.pptx at slide 4
Found "keyword" in hoge/hoge.pptx at slide 1
Found "keyword" in test.pptx at slide 3