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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    A kernel does not implement the binaries, as you should know. The latter are stored in /system/bin, /system/xbin or /sbin. – Death Mask Salesman Mar 27 '16 at 17:35
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    If you need additional commands, check for "Busybox". Though its installation usually requires root access, there's at least one that does not. – Izzy Mar 27 '16 at 17:47
  • This is similar to asking why applesauce does not have a crust, because apple pie and applesauce are both based on apples. – Matthew Read Mar 28 '16 at 3:27

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.

The Android Shell

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.

Built in Commands

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.

Futher Reading

Please check this question and this page for more details.

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