linux commands

How to use OptiPNG recursively

Few hours ago I wrote about image optimization with Jpegoptim. Now I'll write few words about Optipng, a PNG and GIF optimizer. 

OptiPNG is a PNG optimizer that re-compresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections. If you wish to learn how PNG optimization works, or to know about other similar tools, see the PNG-Tech article A guide to PNG optimization.

How to use Jpegoptim recursively

Jpegoptim is a Linux software that does what the name suggests: is does optimize jpg images. It is one of the two recommended software for Google Pagespeed optimization.

As this software doesn't have a recursion parameter, we use a trick to parse all the subdirectories where we have jpeg images to be optimized.

Chmod files and directories recursively

Chmod directories recursively: find . -type d -exec chmod 755 {} \;

Chmod files recursively: find . -type f -exec chmod 644 {} \;

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