-
rev-parse [something]
- show the SHA of any weird git phrase
-
hash-object -w [file]
- take any file or stdin and return a blob sha
-
ls-tree (-r) [sha]
-
show the entries of a git tree in the db
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
[Android Transition Framework][transition-framework] can be used for three main things:
- Animate activity layout content when transitioning from one activity to another.
- Animate shared elements (Hero views) in transitions between activities.
- Animate view changes within same activity.
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/* | |
* Copyright (C) 2016 Jeff Gilfelt. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software |
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#!/usr/bin/env bash | |
# | |
# Usage: | |
# mac-incr # increase the MAC address | |
# mac-incr -d # decrease the MAC address | |
# | |
set -e | |
INTERFACE="en0" |
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