how to sed for certain parts of a string by delimiter [closed]

问题

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Closed 20 days ago.

I have lots of different strings that look like redhat-ubi-ubi7-7.8

I want to use the string to make variables so that I end up having something like

vendor=redhat
product=ubi
image=ubi7
tag=7.8

How can I do this?

回答1:

With bash and a here string:

string='redhat-ubi-ubi7-7.8'
IFS=- read -r vendor product image tag <<< "$string"
echo "$vendor"

Output:

redhat

回答2:

Using P.E. parameter expansion.

string='redhat-ubi-ubi7-7.8'
vendor=${string%%-*}
tag=${string##*-}
image=${string%-*}
product=${image#*-}
product=${product%-*}
image=${image##*-}

printf '%s\n' vendor=$vendor product=$product image=$image tag=$tag

Output

vendor=redhat
product=ubi
image=ubi7
tag=7.8

来源：https://stackoverflow.com/questions/60572406/how-to-sed-for-certain-parts-of-a-string-by-delimiter