I can not use sudo and other commands in ubuntu on amazon server -

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i create server on amazon , want connect ssh in putty. connect can not send comands. have errors:

sudo apt-get install openjdk-7-jdk sudo: apt-get: command not found    apt-get install openjdk-7-jdk -bash: apt-get: command not found  root apt-get install openjdk-7-jdk -bash: root: command not found

but if write sudo

 sudo usage: sudo [-d level] -h | -k | -k | -v usage: sudo -v [-akns] [-d level] [-g groupname|#gid] [-p prompt] [-u user             name|#uid] usage: sudo -l[l] [-akns] [-d level] [-g groupname|#gid] [-p prompt] [-u user             name] [-u user name|#uid] [-g groupname|#gid] [command] usage: sudo [-abehknps] [-r role] [-t type] [-c fd] [-d level] [-g             groupname|#gid] [-p prompt] [-u user name|#uid] [-g groupname|#gid]             [var=value] [-i|-s] [<command>] usage: sudo -e [-akns] [-r role] [-t type] [-c fd] [-d level] [-g             groupname|#gid] [-p prompt] [-u user name|#uid] file ...

what it?

it not sudo causing trouble missing apt-get.

check version of linux running on instance. default amazon linux ami uses yum package manager has not apt-get installed.

try installing yum instead of apt-get:

sudo yum <package-name>

to install openjdk, should work on amazon linux ami:

sudo yum install java-1.7.0-openjdk

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