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Processing JSON using jq

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

Installing jq

On Mac OS

brew install jq

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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:

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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

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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"'

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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

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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

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Scala

Convert Seq To Map

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

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Installation

On linux

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

On Mac OS

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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

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#
#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