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How to track child process using strace?
...c
(anon)
+-- touch /tmp/ppp.sleep
+-- killall -HUP pppd
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 70%
+-- amixer set Speaker 50%
+-- amixer set Speaker 70%
`-- amixer set Speaker 50%
The output can be used to help na...
Maven2 property that indicates the parent directory
...
Try setting a property in each pom to find the main project directory.
In the parent:
<properties>
<main.basedir>${project.basedir}</main.basedir>
</properties>
In the children:
<properties&...
Local variables in nested functions
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
Remove all files except some from a directory
...o the following -
export GLOBIGNORE=*.php:*.sql
rm *
export GLOBIGNORE=
Setting GLOBIGNORE like this ignores php and sql from wildcards used like "ls *" or "rm *". So, using "rm *" after setting the variable will delete only txt and tar.gz file.
...
Python dictionary: Get list of values for list of keys
...: 2, 'three': 3}
mykeys = ['three', 'one'] # if there are many keys, use a set
[mydict[k] for k in mykeys]
=> [3, 1]
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Border around specific rows in a table?
...
Understood, I needed that too. Enclose the set of rows you want a border around in their own tbody, and the above css will create a border around the set of them -- i.e., a top border on the top row, a bottom border on the bottom row, and left and right borders on all...
Unit testing that events are raised in C# (in order)
...d AssertPropertyChanged<T>(T instance, Action<T> actionPropertySetter, string expectedPropertyName) where T : INotifyPropertyChanged
{
string actual = null;
instance.PropertyChanged += delegate (object sender, PropertyChangedEventArgs e)
{
actual =...
boost Composite keys - C/C++ - 清泛网 - 专注C/C++及内核技术
...ed_non_unique<member<employee,std::string,&employee::name> > >
> employee_set;
Note that this is specified in exactly the same manner as a multi_index_container of actual employee objects: member takes care of the extra dereferencing needed to gain access to employee::name. A similar functiona...
How to count lines in a document?
...
Use wc:
wc -l <filename>
This will output the number of lines in <filename>:
$ wc -l /dir/file.txt
3272485 /dir/file.txt
Or, to omit the <filename> from the result use wc -l < <filename>:
$ wc -l < /dir/file...
Regular expression to match non-ASCII characters?
...+
It matches any character which is not contained in the ASCII character set (0-127, i.e. 0x0 to 0x7F).
You can do the same thing with Unicode:
[^\u0000-\u007F]+
For unicode you can look at this 2 resources:
Code charts list of Unicode ranges
This tool to create a regex filtered by Unicod...