pngrep

README

PNGrep

A simple tool to grep through the text hunks of PNG images. Similar in use to exigrep, which does the same for the EXIF tags of JPEG/JFIF files.

Usage of pngrep:

pngrep [options] <regex> <file> [file, ...]
Options:
  -i	Make regexp case-insensitive
  -w	Show matching text chunk

Differences to classic grep behavior:

• by default does not show the matching chunk, can be enabled with -w.
• doesn't work with stdin, at least one filename must be specified.
• does not have an -r (recursive) switch since that is better handled by find.
• regex flavor is Go regular expressions, as documented in https://github.com/google/re2/wiki/Syntax