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Those Command Are Present In 'help' Command They Are Internal Command Or Not....

2 Answers2

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At the very top of the help output:

GNU bash, version 4.4.18(1)-release (x86_64-pc-linux-gnu)
These shell commands are defined internally.  Type `help' to see this list.

Thus, they are internal.

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If you see all the internal command in ubuntu then type 'help' command in terminal

Or

Use 'type' command to check ..

eg. $ type type

$ type is a shell builtin