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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...
Select top 10 records for each category
...
If you really just want the top 10, change it to RowNumber() instead of Rank(). No ties then.
– Mike L
Oct 7 '08 at 3:26
...
Way to get all alphabetic chars in an array in PHP?
Is there a way to get all alphabetic chars (A-Z) in an array in PHP so I can loop through them and display them?
14 Answers...
How do I find where JDK is installed on my windows machine?
...
Actually, the form %VAR_NAME% is Windows
– sblundy
Jan 13 '11 at 14:29
2
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使用 C++ 处理 JSON 数据交换格式 - C/C++ - 清泛网 - 专注C/C++及内核技术
...译（默认是使用 VS2003 编译器的，打开时直接按照 VS2005 提示转换即可）。
四、jsoncpp 使用详解
jsoncpp 主要包含三种类型的 class：Value、Reader、Writer。jsoncpp 中所有对象、类名都在namespace Json 中，包含 json.h 即可。
Json::Va...
How to delete an item in a list if it exists?
...d catch relevant Exceptions:
try:
some_list.remove(thing)
except ValueError:
pass # or scream: thing not in some_list!
except AttributeError:
call_security("some_list not quacking like a list!")
Off course the second except clause in the example above is not only of questionable humor...
INSERT INTO…SELECT for all MySQL columns
...ble
WHERE entry_date < '2011-01-01 00:00:00'
For avoiding primary key errors if you already have data in the archive table
INSERT INTO this_table_archive
SELECT t.*
FROM this_table t
LEFT JOIN this_table_archive a on a.id=t.id
WHERE t.entry_date < '2011-01-01 00:00:00'
AND a.id is null #...
Using GCC to produce readable assembly?
...is nice:
-r shows symbol names on relocations (so you'd see puts in the call instruction below)
-R shows dynamic-linking relocations / symbol names (useful on shared libraries)
-C demangles C++ symbol names
-w is "wide" mode: it doesn't line-wrap the machine-code bytes
-Mintel: use GAS/binutils MA...
Check if an apt-get package is installed and then install it if it's not on Linux
...s upon finding that the package is missing, such as simply exiting with an error code.
REQUIRED_PKG="some-package"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
echo "No $REQUIRED_P...
How to add hyperlink in JLabel?
...Desktop.getDesktop().browse(uri);
} catch (IOException e) { /* TODO: error handling */ }
} else { /* TODO: error handling */ }
}
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