brain dump #1

for i in $(cat /usr/local/hadoop/conf/slaves); do scp mapred-site.xml $i:/usr/local/hadoop/conf/mapred-site.xml; done

if (grep -q "^/usr/local/lib$" /etc/ld.so.conf); then echo ""; else echo "/usr/local/lib" >> /etc/ld.so.conf; fi

lftp :~> set ftp:ssl-force true
lftp :~> set ftp:ssl-protect-data true
lftp :~> set ssl:verify-certificate true
lftp :~> connect ftp.domain.tld
lftp ftp.domain.tld:~> login my_username

test ssl anonymous auth:
openssl s_client -starttls smtp -crlf -connect some_mail_server:25 -cipher aNULL

test ssl on smtp:
openssl s_client -starttls smtp -crlf -connect some_mail_server:25

low cipher checks:
openssl s_client -connect some_web_server:443 -cipher LOW:EXP

shadow hash:
openssl passwd -1 -salt XXYYZZ11

screen rsync -avz /source/dir/ /target/dir/

rsync -avz -e ssh /source/dir/ user@target_system:/target/dir/

rsync -avz --delete /source/dir/ /target/dir/

rsync -avz --exclude=.snapshot /source/dir/ /target/dir/