Command requires file, avoid creating temporary file

Asked Sep 06 '18 at 07:55

Active Sep 06 '18 at 10:07

Viewed 84 times

<() doesn't seem to do what I expect.

This command requires a text file (it's JLinkExe, the text file contains commands for JLinkExe to run. But that shouldn't matter).

JLinkExe -CommanderScript <scriptfile>

I need to create the files dynamically, since their content depend on what I'm currently trying to achieve.

My current solution is to create a temporary file, fill it with content with printf, then call the JLinkExe command with that temporary file.

I have a feeling that this should be achievable with <(), but I don't succeed.

This doesn't work:

JLinkExe -CommanderScript <(printf "ShowEmuList\nexit\n")

I was expecting <() to create a temporary file descriptor, with the content of the file being the string. It works with cat, but JLinkExe complains the it cannot read the command file.

Am I wrong, or is it just that JLinkExe is stupid (it doesn't take stdin)?

edited Sep 06 '18 at 10:07

Jeff Schaller

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asked Sep 06 '18 at 07:55

Gauthier

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From their wiki it appears it **needs** a file: `-CommanderScript Selects a J-Link Commander Command file which contains the commands for the batch mode.` – Daniele Santi Sep 06 '18 at 08:04
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Maybe `JLinkExe` expects the file to be seekable? – Kamil Maciorowski Sep 06 '18 at 08:04
@MrShunz: so `<()` doesn't fake a file? I thought that's what it did, and that the application wouldn't be able to tell. – Gauthier Sep 06 '18 at 08:18
@Gauthier looks like Kamil is right. Probably `JLinkExe` needs the file to be seekable. – Daniele Santi Sep 06 '18 at 08:45
Thanks, that makes sense! And I guess zsh's `=()` would make it, but I don't want to require zsh. – Gauthier Sep 06 '18 at 08:49

Command requires file, avoid creating temporary file

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