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How to initialize log4j properly?
...nfigurator.configure();
will setup basic logging to the console, and the error messages will be gone.
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Iterating over Java collections in Scala
I'm writing some Scala code which uses the Apache POI API. I would like to iterate over the rows contained in the java.util.Iterator that I get from the Sheet class. I would like to use the iterator in a for each style loop, so I have been trying to convert it to a native Scala collection but ...
Convert one date format into another in PHP
..., an invalid date that doesn't exactly match the format will return: Fatal error: Call to a member function format() on a non-object. Just a heads up!
– Rob W
Apr 11 '14 at 13:48
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How to write a UTF-8 file with Java?
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edited Apr 21 '18 at 4:05
Neuron
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answered Jun...
Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
....tgz"
cd /data/nginx/logs
if [ -f "$FILE" ];then
echo "OK"
else
echo "error $FILE" > error.log
mail -s "$FILE backup fail" test@tsingfun.com <error.log
fi
2、清除相关文件，并按时间段记录日志
#!/bin/sh
# 清除相关文件，并按时间段记录日志
#
DIR=/data/img_c...
Python append() vs. + operator on lists, why do these give different results?
Why do these two operations ( append() resp. + ) give different results?
7 Answers
7...
What does .SD stand for in data.table in R
...he heterogeneity in this relationship as follows (noting that the standard errors from this approach are generally incorrect -- the specification ERA ~ W*teamID will be better -- this approach is easier to read and the coefficients are OK):
# use the .N > 20 filter to exclude teams with few obse...
How to find patterns across multiple lines using grep?
... to (\n|.)* and the latter is shorter. Moreover on my system, "pcre_exec() error -8" occurs when I run the longer version. So try 'abc(\n|.)*efg' instead!
– daveagp
Feb 7 '13 at 0:52
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How to copy from CSV file to PostgreSQL table with headers in CSV file?
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Got syntax error at or near "HEADER" LINE 2: delimiter ',' CSV HEADER on aws redshift.
– Mithril
Jan 5 '19 at 9:32
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How to overcome root domain CNAME restrictions?
...uld be
present;
And Per IETF 'Common DNS Operational and Configuration Errors' Document:
This is often attempted by inexperienced administrators as an obvious
way to allow your domain name to also be a host. However, DNS
servers like BIND will see the CNAME and refuse to add any o...