olih

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

olih

Using curl with custom CA certificates

This document describes how to use curl with both custom and official CA SSL certificates.

Prerequisite

You would need first to install curl , see http://curl.haxx.se/docs/install.html. Using a package manager such as yum, brew, ... for your platform should be the easiest though.

Example for Mac OS:

olih

SSL cheetsheet

Encode file with password

alias enc='openssl enc -e -aes128 -base64 -pass "env:PASS"'

Decode file with password

alias dec='openssl enc -d -aes128 -base64 -pass "env:PASS"'

olih

Redis Commands:

• APPEND key value Append a value to a key
• AUTH password Authenticate to the server
• BGREWRITEAOF Asynchronously rewrite the append-only file
• BGSAVE Asynchronously save the dataset to disk
• BITCOUNT key start end Count set bits in a string
• BITFIELD key GET type offset SET type offset value INCRBY type offset increment OVERFLOW WRAP|SAT|FAIL Perform arbitrary bitfield integer operations on strings
• BITOP operation destkey key key ... Perform bitwise operations between strings
• BITPOS key bit start end Find first bit set or clear in a string

olih

My Bookmarks

Shell

• adds flavor of interactive filtering to the traditional pipe concept of UNIX shell
• seven-command-line-tools-for-data-science.html

Html/Css

• You might not need javascript

olih

Scala

Convert Seq To Map

val map = seq.map(a => a.key -> a).toMap

olih

Installation

On linux

sudo yum install -y epel-release
sudo yum install R

On Mac OS

olih

awk & sed cheetsheet

Extract lines between start and end

between() { sed -n "/^$1/,/^$2/p" | sed '1d;$d'; }

Also:

awk '/^START=A$/,/^END$/ { print }’ data

olih

method	path	header	query,entity	status	description
-	-	-	Any	400 Bad Request	The request could not be understood by the server due to malformed syntax
-	-	Any	Any	403 Forbidden	The server understood the request, but is refusing to fulfill it
-	Any	-	-	404 Not Found	The server has not found anything matching the Request-URI
Any	-	-	-	405 Method Not Allowed	The method specified (GET, PUT...) in the Request-Line is not allowed for the resource
-	-	Any	-	412 Precondition Failed	The precondition given in one or more of the request-header fields evaluated to false
-	-	Any	-	431 Request Header Fields Too Large (RFC 6585)	The server is unwilling to process the the header fields are too large.
-	-	-	Any	413 Request Entity Too Large	The server is refusing to process a request because the request entity is too large
-	-	-	Any	414 Reques

olih

#
#Creator: 2013, Olivier Huin (https://github.com/olih)
#License: Eclipse Public License - v 1.0
#Contributors:
#
# Generates a random password
#This code is a quick hack and should not be used for production
#as it is not optimized and the random numbers could be predicted.

G=10000000000