shell通过sed提取xml标签值

方法

$ eureka=`curl $EUREKA_HOST/eureka/apps/$APP_NAME -s`
$ instanceId=$(sed -n -e 's/.*<instanceId>\(.*\)<\/instanceId>.*/\1/p' <<< $eureka)
$ echo $instanceId

$ eureka=`curl $EUREKA_HOST/eureka/apps/$APP_NAME -s`
$ echo $eureka | sed 's/^.*<instanceId>//g'| sed 's/<\/instanceId>.*$//g'

$ eureka=`curl $EUREKA_HOST/eureka/apps/$APP_NAME -s`
$ instanceId=$(grep -oPm1 "(?<=<instanceId>)[^<]+" <<< "$eureka")
$ echo $instanceId

参考

• Why does sed not replace all occurrences
• Extract XML Value in bash script