dont use gnu specific grep

[brian-level]

grep -oP is specific to GNU versions of grep which aren't (any longer) used on Mac/OSX platforms. The use in scripts is a bit overkill for just getting a token. This replaces grep with bash-native parsing

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[lmnotran]

Hi @brian-level ! Thanks for submitting the PR!

Theoretically, you shouldn't have run into this issue if you ran ./script/bootstrap on your system since it installs GNU grep. Every system is different though, so maybe I missed something. Either way, replacing -oP with bash-native parsing is an improvement. Could you remove grep from script/bootstrap in this PR as well?

Also, please sign the CLA.

[brian-level]

Hi @brian-level ! Thanks for submitting the PR!

Theoretically, you shouldn't have run into this issue if you ran ./script/bootstrap on your system since it installs GNU grep. Every system is different though, so maybe I missed something. Either way, replacing -oP with bash-native parsing is an improvement. Could you remove grep from script/bootstrap in this PR as well?

Also, please sign the CLA.

CLA I had signed earlier for a PR to openthread. Maybe it'll apply here?

Question: in "openthread/scripts/check-api-version" it seems like the line 59

[[ $(wc -l <"${OT_VERSIONS_FILE}") == 2 ]] || die 'Multiple OPENTHREAD_API_VERSION definitions found!'

Will flag the normal case since the grep looks for [-+]#define so will have 2 lines? I think that == should be a != ?

[jwhui]

CLA I had signed earlier for a PR to openthread. Maybe it'll apply here?

@brian-level , yes it applies here as well. Thanks.

[brian-level]

Question: in "openthread/scripts/check-api-version" it seems like the line 59

[[ $(wc -l <"${OT_VERSIONS_FILE}") == 2 ]] || die 'Multiple OPENTHREAD_API_VERSION definitions found!'

Will flag the normal case since the grep looks for [-+]#define so will have 2 lines? I think that == should be a != ?

Please see above question. not sure about it.

I will make a new PR in openthread/openthread with the above script change

I think I need to leave grep in the bootstrap. There could be cases where people on non-Macs need it, or on Macs if they haven't installed the xcode commandline tools perhaps.

The issue is that newer mac os doesnt allow even sudo access to /usr/bin and other places where things like grep are installed by Xcode which override brew apps. I have this issue with cmake as well. Using simpler greps is better IMHO anyway but there was really nothing wrong with the scripts except for Apple deciding to be Apple