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I'm trying to set an environment variable and execute a command in a single line, like this:

export PUB_CACHE=/app/src/.pub-cache && dart-sdk/bin/dart server.dart

(Don't ask why... it's complicated ;))

It's being invoked by someone elses script; and it fails like this:

export: `&&': not a valid identifier6:44 PM
export: `dart-sdk/bin/dart': not a valid identifier6:44 PM
export: `server.dart': not a valid identifier

It seems like the entire rest of the line is being passed to export. It's entirely possible it's due to the way they're running the command and I can't fix it, but it's also possibly just my Linux noobishness.

Is there something wrong with my command? Can I easily make it execute both things individually?

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  • Just removing the &&. – cuonglm Apr 15 '16 at 17:53
  • I'm confused; won't that add it to what's being exported? I need the var defined and then Dart calling – Danny Tuppeny Apr 15 '16 at 18:20
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    is it really using bash, as you've tagged? It's acting almost like a Bourne (not Again) shell with the export syntax. Try breaking it into multiple lines (PUB_CACHE=...; export PUB_CACHE; dart-sdk/bin/dart...) – Jeff Schaller♦ Apr 15 '16 at 18:51
  • The command works for me here (except that I don't have any dart installation, so the second part fails). Are you sure you're not using dash or any other shell? What does echo $0 print? What if you remove the && or replace it by ;? – Murphy Apr 15 '16 at 19:34
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    Not answering the question, but you want env, not export -- env VAR=thing someCommand, or with bash, just VAR=thing someCommand – glenn jackman Apr 15 '16 at 19:40
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Managed to fix it with this:

env PUB_CACHE=/app/src/.pub-cache dart-sdk/bin/dart server.dart

Didn't realise you could pass commands on the end (thanks cuonglm for getting me on to this in the comments!)

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    env is not necessary here, PUB_CACHE=/app/src/.pub-cache dart-sdk/bin/dart server.dart will equally work. – jlliagre Apr 16 '16 at 12:31

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