使用awk，您可以执行以下操作:

Using awk you can do:

awk -F ': *' -v OFS=: '$1~/Person Name/{p=$2} $1~/Purchases/{print p, $0}' file

Joe Soap:Purchases:12th June 2013 - Awk for Dummies Vol1
Joe Soap:Purchases:42th June 2013 - Awk for Dummies Vol2
Joe Soap:Purchases:22th June 2013 - Awk for Dummies Vol3
Mary Soap:Purchases:52th June 2013 - Sed for Microsoft Lovers Vol1
Mary Soap:Purchases:82th June 2013 - Sed for Microsoft Lovers Vol2
Don Soap:Purchases:3rd March 2013 - Self Healing