xiaom

#!/bin/sh
tar -xzvf eclipse*.tar.gz -C /opt
chmod -R +r /opt/eclipse

# use the technique "HERE document"
# http://tldp.org/LDP/abs/html/here-docs.html
(cat  <<'EOF'
#!/bin/sh
export ECLIPSE_HOME="/opt/eclipse"
$ECLIPSE_HOME/eclipse $*

xiaom

ack DataMode.OPTIONAL | awk 'BEGIN {FS =":"} {print $1}' | xargs sed -i "s/DataMode.OPTIONAL/DataMode.DM_OPTIONAL/g"

xiaom

# Let us assume
#
# - you have a laptop A
# - you work at company C
# 
# how can you access C from A?
#
# Solution: a middle man B
# 
# http://www.revsys.com/writings/quicktips/ssh-tunnel.html

xiaom

#!/bin/sh

# http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.0.0.2/bk_reference/content/reference_chap3_1.html

export HIVE_HOME=/opt/hive/hive-0.12.0-bin/
export HIVE_CONF=$HIVE_HOME/conf.drill/
su -l hive -c "env HADOOP_HOME=/usr nohup $HIVE_HOME/bin/hive --service metastore > /tmp/hive.out 2> /tmp/hive.log   &"  
su -l hive -c "nohup $HIVE_HOME/bin/hiveserver2 -hiveconf hive.metastore.uris=\" \" > /tmp/hiveServer2.out 2>/tmp/hiveServer2.log &" 

xiaom

#!/bin/sh
# Stop Hive (kill all process owened by user 'hive')

ps aux | awk '{print $1,$2}' | grep hive | awk '{print $2}' | xargs kill >/dev/null 2>&1  

xiaom

select
cast('2008-2-23' as date) as DATE_TYPE,
cast('12:20:30' as time) as TIME_TYPE,
cast('2008-2-23 12:00:00' as timestamp) as TIMESTAMP_TYPE
FROM
INFORMATION_SCHEMA.`SCHEMATA`;

xiaom

should we always use ::std::cout?

Use it only when you have to do. For example,

namespace X {
    double std(::std::vector<double> const& values) { … }

 void foo(::std::vector const&amp; values) {

xiaom

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

xiaom

# http://docs.python.org/faq/programming.html#how-do-you-remove-duplicates-from-a-list
mylist = list(set(mylist))

xiaom

# http://stackoverflow.com/questions/893417/item-frequency-count-in-python
# defaultdict will automatically initialize values to zero.

from collections import defaultdict

words = "apple banana apple strawberry banana lemon"

d = defaultdict(int)
for word in words.split():
    d[word] += 1