ssh - How to pipe output from local to remote server

In Bash, with pipe (the "|" symbol) and ssh makes a good combination of server administration tool, securely. Some examples :

• file backup from local to remote server :
  

  tar zcf - /some/directory | ssh username@server "cat > backup.tar.gz"

  or same thing, using dump instead :
  

  tar zcf - /some/directory | ssh username@server "dd of=filename.bz2"

• output from local to remote server :
  

  echo "some text" | ssh username@example.com "cat > somefile.txt"

  or
  

  cat ~/.ssh/id_rsa.pub | ssh username@example.com "cat >> ~/.ssh/authorized_keys"

• backup local mysql database to remote server :
  

  mysqldump --opt database_name | gzip -c | ssh username@example.com "cat > /remote/dir/DB_backup.gz"

  or using tar to backup database :
  

  mysqldump | tar cf - | gzip -c | ssh username@example.com "cat > /remote/dir/DB_backup.tar.gz"

• execute commands on remote server :
  

  ssh username@example.com "uname -a"

  or execute commands on remote server but save the output to local :
  

  ssh user@example.com "mysqldump -u DB_username -pDB_password DB_name | gzip -c" > /local/dir/DB_backup.gz

  *** the "-p" parameter of "mysqldump" needs the value immediately after the parameter, no space.

These are just a few ways to make use of bash & ssh. You have any?

Nemaste !!!