There are a lot of standard Linux commands that do not work from a Terminal Emulator in Android. I thought Android is based on the Linux kernel, but it lacks so many functions, like
man groups find
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This is not a bash. In the beginning of my journey in android I have seen that the android shell is a little bit different from bash.
A "shell" is a program that listens to keyboard input from a user and performs actions as directed by the user. Android devices come with a simple shell program. This shell program is mostly undocumented. Since many people are curious about it I thought I'd write up some documentation for it.
Every shell has a few built-in commands. Some common built-in commands are:
echo -- prints text to stdout.
set -- sets shell variables
export -- makes shell variables available to command-line programs
cd -- change the current directory.
pwd -- print name of the current directory.