Question

I want to something like this in bash:

 alias foo='bar="$(echo hello world | grep \"hello world\")"; echo $bar;'; foo

Expected output: hello world

Ouput: grep: world”: No such file or directory

• The outer quotes have to be single quotes, with double quotes $bar would be empty.

• The next quotes have to be double quotes, with single quotes $() wouldn’t expand.

• The inner quotes could be both type of quotes, but single quotes doesn’t allow single quotes inside of them.

How to I achieve this?

Answer 1

The stuff inside $() represents a subshell, so you are allowed to place un-escaped double quotes inside

alias foo='bar="$(echo testing hello world | grep "hello world")"; echo "$bar"'