Programming

perldoc.perl.org - Perl documentation
Java API - Java SE 8 API
PHP manual - PHP manual

IMAP sync
sudo apt-get install -y imapsync
imapsync \
--host1 imap.SRV1.com --user1 user1@example.com --password1 *** \
--host2 imap.SRV2.de --user2 user2@example2.com --password2 *** \
--noauthmd5

create patch
diff -Naur FILE_ORG FILE_EDITED > FILE.diff

Gedit add regexp search and replace
http://www.kiwwito.com/article/regex-in-search-and-replace-for-gedit