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Steffen Uhlig suhlig

  • IBM
  • Cloud
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suhlig / defined.rb
Created Jun 1, 2016
Side effect of defined?
View defined.rb
$ pry
pry> foo
NameError: undefined local variable or method `foo' for main:Object
pry> if defined?(foo)
* bar = 1
* end
=> nil
pry> if defined?(bar)
* puts "oops"
* end
suhlig / parse-cc-logs
Last active Jun 24, 2016
Parsing cloud controller logs with jq (also converts time stamps to be human-readable)
View parse-cc-logs
cat cloud_controller_ng.log | jq -r '{timestamp: .timestamp|todate, source, message, loc: [.file, .lineno|tostring] | join(":")} | join(" - ")'
suhlig /
Created May 12, 2017
Keybase proof

Keybase proof

I hereby claim:

  • I am suhlig on github.
  • I am suhlig ( on keybase.
  • I have a public key ASCmKYO26B9hxHc0EXQJzoS4a_NQLrdDiNE3J_BT40XrNQo

To claim this, I am signing this object:


Freifunk is Down

Log on

  1. Connect the C.H.I.P. via USB to a Mac and execute screen /dev/tty.usbmodem*. It will bring up a serial console (via USB).
  2. Log on (you may have to press Enter before that, so that the login prompt appears)
  3. When done, exit with Control-a, Control-d (where Control-a is the prefix).

Check the WiFi connection

suhlig / gist:89e1cbb183eacb33af6070669cc0eb3e
Last active Nov 1, 2017
Multi-line fenced code blocks fail in numbered lists
View gist:89e1cbb183eacb33af6070669cc0eb3e
1. This does not work:
$ some command
$ some other command
1. This, however, does work fine (note the alignment of 'This' with the block using an extra space):
suhlig / cf-app-lifecycle.markdown
Created Dec 8, 2017
Presentation on the Cloud Foundry Application Lifecycle
View cf-app-lifecycle.markdown

Cloud Foundry Application Lifecycle


What happens between cf push and "state: running"? We will have a look at how the Cloud Foundry part of the IBM Cloud creates and manages applications. Attending this session will give you an in-depth understanding of application deployment works and where to look in case of trouble. (edited)

Happy Day

cd ~/workspace/cf-acceptance-tests/assets/dora
suhlig / inline-erb.rb
Last active Jul 20, 2018
'Blocky' ERB syntax
View inline-erb.rb
require 'erb'
class UserTemplate
def initialize(user)
@user = user
def to_s
# In the ERB template, we can refer to all instance variables, etc. due to
# the binding being passed.
suhlig / cf-all-apps
Created Jun 29, 2019
List all cf apps across all orgs and spaces
View cf-all-apps
#!/usr/bin/env ruby
require 'json'
require 'shellwords'
HIERARCHY = %w(/ org space app)
def curl(url)
while url
JSON.parse(`cf curl #{Shellwords.escape(url)}`).tap do |result|
suhlig / cf-which-org
Created Jul 12, 2019
Prints the space and org names for a given route, filtered down to the hostname
View cf-which-org
#!/usr/bin/env ruby
# Prints the space and org names for a given route, filtered down to the hostname
require 'json'
require 'shellwords'
def curl(url)
while url
JSON.parse(`cf curl #{Shellwords.escape(url)}`).tap do |result|
View switch-fly-version.markdown

I work with a lot of different Concourse servers that have a variety of versions. fly rejects working with servers that are off to much. Therefore I have fly-3.14.1, fly-4.2.3 etc. on my machine.

But many set-pipeline scripts assume that a single fly command exists and that it magically is of the right version. So I need to switch; preferably per directory or per shell.

Did not work

  • Shell aliases are never exported, so that a set-pipeline script does not know about the alias.
  • I use ZSH, where functions cannot be exported.