# start TOR
tor

# create tunnel
socat TCP-LISTEN:<port> SOCKS4A:localhost:<host>:22,socksport=9050

# login through local tunnel
ssh <user>@localhost -p <port>

bash

1

SSH via TOR using SOCAT

# start TOR
tor

# create tunnel
socat TCP-LISTEN:<port> SOCKS4A:localhost:<host>:22,socksport=9050

# login through local tunnel
ssh <user>@localhost -p <port>

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• socat, 
• ssh, 
• tor

# generate key
gpg --gen-key



# export public key in ASCII format
gpg --export -a <username> > <filename>

# import public key
gpg --import <filename>

# remove public key
gpg --delete-key <username>

# list all public keys
gpg --list-keys



# encrypt file
gpg --encrypt --recipient <username> <filename>
gpg -e -r <username> <filename>

# decrypt file
gpg --decrypt <filename>
gpg -d <filename>



# add email address
gpg --edit-key <username> adduid



# sign public key
gpg --sign-key <username>

# list signatures
gpg --list-sigs [<username>]



# receive keys from server using key ids
gpg [--keyserver <server>] --recv-keys <keyid>

# send signed key
gpg [--keyserver <server>] --send-key <keyid>

# update already received keys
gpg [--keyserver <server>] --refresh-keys

bash

1

GPG Basics

# generate key
gpg --gen-key



# export public key in ASCII format
gpg --export -a <username> > <filename>

# import public key
gpg --import <filename>

# remove public key
gpg --delete-key <username>

# list all public keys
gpg --list-keys



# encrypt file
gpg --encrypt --recipient <username> <filename>
gpg -e -r <username> <filename>

# decrypt file
gpg --decrypt <filename>
gpg -d <filename>



# add email address
gpg --edit-key <username> adduid



# sign public key
gpg --sign-key <username>

# list signatures
gpg --list-sigs [<username>]



# receive keys from server using key ids
gpg [--keyserver <server>] --recv-keys <keyid>

# send signed key
gpg [--keyserver <server>] --send-key <keyid>

# update already received keys
gpg [--keyserver <server>] --refresh-keys

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• gpg, 
• pgp

% include package
\usepackage{setspace}

% use one of the following
\singlespacing
\onehalfspacing
\doublespacing
\setstretch{3}

tex

1

Line Spacing

% include package
\usepackage{setspace}

% use one of the following
\singlespacing
\onehalfspacing
\doublespacing
\setstretch{3}

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• spacing

# list available amazon machine images (AMIs)
ec2-describe-images -o amazon
ec2-describe-images -a

# boot instance
ec2-run-instances <ami-id> -k <keypair-file>

# list running instances
ec2-describe-instances

# open/close ports on virtual server (open port 22 for ssh)
ec2-authorize default -p <port>
ec2-revoke default -p <port>

# log into instance
ssh -i <keypair-file> root@ec2-<address>.compute-1.amazonaws.com

# shut down instance
ec2-terminate-instances i-<instance-id>

bash

1

Amazon EC2 Basics

# list available amazon machine images (AMIs)
ec2-describe-images -o amazon
ec2-describe-images -a

# boot instance
ec2-run-instances <ami-id> -k <keypair-file>

# list running instances
ec2-describe-instances

# open/close ports on virtual server (open port 22 for ssh)
ec2-authorize default -p <port>
ec2-revoke default -p <port>

# log into instance
ssh -i <keypair-file> root@ec2-<address>.compute-1.amazonaws.com

# shut down instance
ec2-terminate-instances i-<instance-id>

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• amazon, 
• ec2

# init a git repository
git init

# add file to repository
git add <filename>

# remove file from repository but not from working dir
git rm --cached <filename>

# commit all changes
git commit -a -m <message>

# change to previous revision
git checkout <revision>

# give current revision a name
git tag <name>



# create new branch
git branch <branch>

# switch to branch
git checkout <branch>



# checkout remote repository
git clone <url>

# checkout changes from remote repository
git pull



# list all files under version control
git ls-files

bash

1

Git Basics

# init a git repository
git init

# add file to repository
git add <filename>

# remove file from repository but not from working dir
git rm --cached <filename>

# commit all changes
git commit -a -m <message>

# change to previous revision
git checkout <revision>

# give current revision a name
git tag <name>



# create new branch
git branch <branch>

# switch to branch
git checkout <branch>



# checkout remote repository
git clone <url>

# checkout changes from remote repository
git pull



# list all files under version control
git ls-files

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• git