CODEWITHSUNDEEP
shellzsh
rreagan3
rreagan3

Reputation: 127

execute a line from a script in the current shell environment

I'd like to execute a range of lines from a shell script from a running shell and using the current shell's environment.

For example, in a script that sets a variable to something I don't want to type (say an API key or MAC address):

line
   1 #!/bin/zsh
   2
   3 # Set the MAC address:
   4 MAC="12-34-56-78-90-ab-cd"
 ...

...and in my shell, I'd like to grab line 4 above, run it, and have $MAC exist in that environment

I've tried sed -n '4p' script.zsh | zsh but that doesn't affect the current shell I'm working in:

$ MAC="this is not a MAC address"
$ sed -n '4p' script.zsh | zsh
$ echo $MAC
---
this is not a MAC address

I could just copy and paste, but I'd like a solution I can use without touching my mouse - or when I don't have a mouse available.

Upvotes: 0

Views: 252

Answers (1)

Eric Renouf
Eric Renouf

Reputation: 14490

You could combine your sed command with a process substitution and source it:

source <(sed -n '4p' script.zsh)

though you might want to use a pattern match for the print line in case the line numbers shift.

source <(sed -n '/^MAC=/p' script.zsh)

Upvotes: 2

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