Interpreting command substitution from a variable in bash

问题

For the following value of FOO:

$ FOO='echo `echo hello`'
$ $FOO
`echo hello`

how can I get the expected output:

hello

Basically, how can I interpret a command substitution in the contents of a variable?

回答1:

Answering the question as given,

eval $FOO

but you're probably going about your real problem the wrong way.

回答2:

Try this

$ FOO="echo `echo hello`"
$ $FOO 

Just replace single quotes with double quotes.

来源：https://stackoverflow.com/questions/11531332/interpreting-command-substitution-from-a-variable-in-bash