$ echo 'ETag: "ae02fff4e2395982747582496ada225d"'
ETag: "ae02fff4e2395982747582496ada225d"
#I want just the ETag value:
$ echo 'ETag: "ae02fff4e2395982747582496ada225d"' |grep -oP '(?<=ETag: ")\w+(?=")'
ae02fff4e2395982747582496ada225d
Ref: http://unix.stackexchange.com/questions/13466/can-grep-output-only-specified-groupings-that-match
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