如何在Bash子shell中执行shell脚本？

Question

I have a shell-function that executes a command within a sub-shell, after setting some environment variables, eg

$ with-env-overrides git status

It's implemented using eval in a sub-shell

with-env-overrides() {
  (
    source $HOME/.env-overrides
    eval "$@"
  )
}

this means I can make use of aliases, and shell-functions, eg

$ with-env-overrides gs    

but unfortunately, eval gets confused when arguments contain spaces, or shell meta-characters, eg

$ with-env-overrides grep "foo bar" /etc/passwd
grep: bar: No such file or directory

How can I achieve this without using eval , but without loosing the ability to use aliases etc?

Answer 1

You can do the same but without eval.

with-env-overrides() {
  (
    source $HOME/.env-overrides
    "$@"
  )
}

Example:

$ cat ~/.env-overrides 
export A=1000
$ export | grep ^A=
$ with-env-overrides export | ^grep A=
declare -x A="1000"

As you can see, in the second case, you've got an environment with the A variable.