Eval

eval will run the arguments as a command in the current shell

• variables will be expanded before executing, so we can execute commands saved in shell variables

Sometimes we have bash commands that output shell commands (ex. ssh-eval) We could run these outputted shell commands in 2 steps:

1. run the command
2. take the output of that command, and run it in the shell

Alternatively, we can just wrap the command in eval

• ex. eval $(ssh-agent)

Say Hello example

say-hello.sh

echo "echo hello"

$ ./say-hello.sh
> echo hello

$ eval $(./say-hello.sh)
> hello