The file tmp.sh contains:

func() {

If the file is sourced using source tmp.sh, the function func works fine.

However, if the sourcing is done as cat tmp.sh | source /dev/stdin bash complaints:

-bash: func3: command not found

What is the difference between the two methods of sourcing? From source's perspective there should not be any difference since /dev/stdin would also be a file handle.


From bash(1): Each command in a pipeline is executed as a separate process (i.e., in a subshell).

The main shell does not have access to the definitions of its subshells.

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