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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...
...断文件是否存在
YACCESS=`date -d yesterday +%Y%m%d`
FILE="access_$YACCESS.log.tgz"
cd /data/nginx/logs
if [ -f "$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...
Why do we need C Unions?
...le types together:
enum Type { INTS, FLOATS, DOUBLE };
struct S
{
Type s_type;
union
{
int s_ints[2];
float s_floats[2];
double s_double;
};
};
void do_something(struct S *s)
{
switch(s->s_type)
{
case INTS: // do something with s->s_ints
break;
case F...
Test if a command outputs an empty string
...
324
Previously, the question asked how to check whether there are files in a directory. The follo...
Where in a virtualenv does the custom code go?
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
Getting list of lists into pandas DataFrame
...000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 47.1084 7.58816C47.4091 7.46349 47.7169 7.36433 48.0099 7.26993C48.9099 6.97997 49.672 6.73443 49.672 5.93063C49.672 5.22043 48.9832 4.61182 48.1414 4.61182C47.4335 4.61182 46.7256 4.91628 46.0943 5.50789C45.7307 4.9328 4...
Find nearest value in numpy array
...does this.
– dbliss
Apr 8 '15 at 19:32
3
@jsmedmar The bisection method (see my below answer) is ...
How to get the error message from the error code returned by GetLastError()?
...
//Returns the last Win32 error, in string format. Returns an empty string if there is no error.
std::string GetLastErrorAsString()
{
//Get the error message, if any.
DWORD errorMessageID = ::GetLastError();
if(errorMessageID == 0)
...
CREATE TABLE IF NOT EXISTS equivalent in SQL Server [duplicate]
...to an answer ;)
– MaxU
Apr 20 at 10:32
|
show 2 more comments
...
Java: Instanceof and Generics
Before I look through my generic data structure for a value's index, I'd like to see if it is even an instance of the type this has been parametrized to.
...
How can I split a text into sentences?
...kenizer.
– martineau
Jan 2 '11 at 0:32
10
You might have to execute nltk.download() first and dow...