20170306_stammtisch.md

Todays questions:

• Florian VIM as Python IDE
• Maria when did a line of code change (yeah actual git question)
• Maria how to check out individual file (with a new name)
• Christian how to add users to a group in Linux
• Christian file directory structure in Linux
• Maria optparse in R debugging

organisational

• invite attendees to common git group
• prepare git training where all do stuff on shared repo and resolve resulting problems
• prepare git workflows hands on
• we have new group https://git.idiv.de/stammtisch and a new project https://git.idiv.de/stammtisch/git-stammtisch.git

answers

Florian, VIM as Python IDE

• tmux and vim, have a look at https://git.idiv.de/scientific-computing/RStudio-Docu/blob/master/tmux.md

• search for tmux, vim and python PEP8

• use ! to execute commands from inside vim on the command line, e.g. the following will run wc on the current file

  :! wc %

• search for dotfiles

• smaller adaptions of vim for python

• bigger adaptions of vim for python

• python mode

Maria, ask git when a line of code did change

• git will tell you in which commit a file changed

  git log dotfile.yml

• git will tell you when the line range in a file changed

  git log -L 10,12:dotfile.yml

• git will tell you when a function in a file changed

  git log -L :is_workday:analysis.r

Maria how to check out individual file (with a new name)

• tell git to checkout file from commit (overwrites current version)

  git checkout 14134e6 muhkuh

• or checkout to a new file (mind the :)

  git checkout  14134e6:muhkuh > newkuh

Christian how to add users to a group in Linux

• append a group to the groups a user is member of

  usermod -a -G groupName userName

Christian file directory structure in Linux

Why do you need a /?

• Everything starts at / (say root).
• Your user usually has a home directory like /home/username
• There is a relative and absolute path
  • a absolute path starts with /
• https://wiki.ubuntuusers.de/Verzeichnisstruktur/

Maria, optparse in R debugging

• time run out, feel free to add pointers/solution here

  ?optparse
  vignette("optparse")