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Adrian Eichelbaum

Progressbar for scripts

• just end the string with \r
• this returns the cursor back to the beginning of line, so next print starts there
• might have to clear the whole line, too, otherwise artefacts remain

Python

for i in range(0, 100):
    print("Processing " + str(i), end='\r')

Bash

for i in ${0..100}; do
    echo -n -e "Processing $i\r"
done

Mount Virtualbox-Image on Linux host

• get image UUID

vboximg-mount --list

• mount create device nodes

vboximg-mount --image <UUID> -o allow_root <folder>

• allow_root has to be enabled in /etc/fuse.conf
• mount node to filesystem

sudo mount <mount> <mountpoint>

Enable GPG commit signing for Git

• create gpg key
• set username and email

git config (--global) user.email <email>
git config (--global) user.name <name>

• set the key to use
  • find the keyID

  gpg -K --keyid-format SHORT

  • the string on the ssb line, after the key type is the keyID

  git config (--global) user.signingKey <keyID>
  git config (--global) commit.gpgsign 1

Add key automatically to ssh-agent

• start ssh-agent

eval `ssh-agent -s`

• you can add this to your .bashrc
• automatically add key to ssh-agent:

# $EDITOR ~/.ssh/config

Host *
    AddKeysToAgent yes

Start ssh-agent automatically

• add following to your /etc/profile

SSH_ENV="$HOME/.ssh/environment"

function start_agent {
     echo "Initialising new SSH agent..."
     /usr/bin/ssh-agent | sed 's/^echo/#echo/' > "${SSH_ENV}"
     echo succeeded
     chmod 600 "${SSH_ENV}"
     . "${SSH_ENV}" > /dev/null
     /usr/bin/ssh-add;
}

# Source SSH settings, if applicable

if [ -f "${SSH_ENV}" ]; then
     . "${SSH_ENV}" > /dev/null
     #ps ${SSH_AGENT_PID} doesn't work under cywgin
     ps -ef | grep ${SSH_AGENT_PID} | grep ssh-agent$ > /dev/null || {
         start_agent;
     }
else
     start_agent;
fi

• this starts the ssh-agent only once, otherwise just updates the env