Bashism - Greg's Wiki

How to make bash scripts work in dash This page is an attempt to list some of the most common bashisms, i.e. features not defined by POSIX (won't work in dash, or general /bin/sh). It probably won't be exhaustive. Note also we talk about "bashism" because this wiki is largely bash-centric but a number (almost all) of these extensions work in at least some other shells like ksh or zsh with perhaps

[tmatsuu]

bash向けに書かれたシェルスクリプトをdash(ash)で動作するために書き換える方法。いわゆる/bin/sh用の書き方なので、dashで動くように書いておくのが互換性的に望ましいですはい。

[y0sh1kaw]

"How to make bash scripts work in dash"