jvmvik

Best command

lshosts - View static resource information about hosts in the cluster

bhosts — View resource and job information about server hosts in the cluster

lsid — View the cluster name

lsclusters — View cluster status and size

Comments can be written like this.

# File should be named Makefile and then can be run as `make <target>`.
# Otherwise we use `make -f "filename" <target>`.

Warning - only use TABS to indent in Makefiles, never spaces!

Basics

Ruby tricks

Best Ruby profiler

Ruby spy : https://github.com/rbspy/rbspy

Documentation system

yard is better than rdoc : https://yardoc.org/

Code

OS realtime

atop : network usage
htop : cpu / memory / io usage
lsof : filesystem handle per pid

Ruby

rbspy : profile ruby application system call [https://github.com/rbspy/rbspy]

Git Trick

Currated list of usefull complex command in git.

Find commmit missing on a branch in order to cherry-pick them.

Search in reverse order the hash of the commit missing on master from the dev branch.

git log origin/master..origin/dev --oneline --reverse  --pretty=format:"%h"
# copy/paste output in vscode to create a single line command like this:
git cherry-pick ef55b76d02f 1b85300d4fa a2197fe36d7

Linux Trick

List files and md5 associated

md5sum * */* 2>/dev/null > md5sum.md5

Remove log files passed

grep -lr "PASSED" $WORK_DIR/*/logs/*log | xargs rm

Inline ruby execution with standard library inclusion

tmux shortcuts & cheatsheet

start new with session name:

tmux new -s master

attach to session by name:

tmux a -t myname

Personal setup for OSX 10+ or Linux

Editor:

Install nano
Install language package: https://github.com/scopatz/nanorc

Git

Install git
Setup gitconfig: https://gist.github.com/jvmvik/7d6cc45d9776a682bb2b0bbbba7e1bd3

	# Tmux 2.5 configuration file
	#
	# ~/.tmux.conf
	#
	# Enable scrooling with the mouse
	#
	# e-tmux-scrolling-in-iterm2/
	set-window-option -g mode-mouse on
	set-option -g mouse-select-pane on
	set-option -g mouse-select-window on

	# IRBRC tweaking for better productivity with Ruby 2+
	# edit: ~/.irbrc

	# save IRB history
	require 'irb/ext/save-history'
	#History configuration
	IRB.conf[:SAVE_HISTORY] = 100
	IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history"

	# enable autocompletion