[ You'll help us both by using <c>..</c> instead of <pre>..</pre> ]

For the one-liners,

perl -i.bk -pe's/^\@poseidon.*//s' AbstractEnum.java
[download]

or

perl -i.bk -ne'print if !/^\@poseidon/' AbstractEnum.java
[download]

Sorry, all I have time for right now.