CODEWITHSUNDEEP
regexmacosbashsed
Granfalloner
Granfalloner

Reputation: 422

Strange sed output

The following command with sed and simple regexp:

echo 'Atest Atest Atest' | sed -E 's/A|$/B/g'

produces output:

Btest Btest B

Could someone explain, please, why does sed eat last word? I expected the output to be something like this:

Btest Btest BtestB

I use sed version bundled with Mac OS ("BSD-flavour").

Update This behaviour looks like a bug, comparing to GNU sed, so I've chosen to stick to the latter one.

Upvotes: 2

Views: 126

Answers (1)

anubhava
anubhava

Reputation: 785196

Interesting, this appears to be some bug (weird behavior) in BSD sed available on OSX. I can reproduce this behavior. Looks this behavior happens only with g flag.

To fix this I would suggest use this equivalent sed command:

echo 'Atest Atest Atest' | sed 's/A/B/g;s/$/B/'
Btest Btest BtestB

Upvotes: 3

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