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Bash script processing limited number of commands in parallel
...;
wait
For the above example, 4 processes process1 ... process4 would be started in the background, and the shell would wait until those are completed before starting the next set.
From the GNU manual:
wait [jobspec or pid ...]
Wait until the child process specified by each process ID pid...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
...n success or failure. It saves values to SharedPreferences immediately but starts an asynchronous commit.
More detail is here.
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PowerShell script to return versions of .NET Framework on a machine?
..."\|$" |
# Then we can build the table by looking for unique lines that start with ".NET Framework"
Select-String "^.NET" | Select-Object -Unique |
# And flip it so it's key = value
# And convert ".NET FRAMEWORK 4.5.2" to [version]4.5.2
ForEach-Object {
[version]$v, [int...
How to trim a string to N chars in Javascript?
...ust use substring... string.substring(0, 7); The first argument (0) is the starting point. The second argument (7) is the ending point (exclusive). More info here.
var string = "this is a string";
var length = 7;
var trimmedString = string.substring(0, length);
...
Creating C formatted strings (not printing them)
...per(const char *format, ...) {
char* string;
va_list args;
va_start(args, format);
if(0 > vasprintf(&string, format, args)) string = NULL; //this is for logging, so failed allocation is not fatal
va_end(args);
if(string) {
log_out(string);
free(str...
Structure padding and packing
... the order of the members will be preserved and that the first member will start at 0 offset.
– martinkunev
Dec 8 '17 at 14:32
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How to 'insert if not exists' in MySQL?
I started by googling, and found this article which talks about mutex tables.
10 Answers
...
MySQL maximum memory usage
...th EXPLAIN. Add to that that MySQL's EXPLAIN is really limited, but it's a start.
Suggested configurations
About these my-large.cnf and my-medium.cnf files -- I don't even know who those were written for. Roll your own.
Tuning primer
A great start is the tuning primer. It's a bash script (hint: ...
Appending the same string to a list of strings in Python
...ments:', len(l)
l1 = list( l )
l2 = list( l )
# Method A
start_time = time.time()
l2 = [s + mystring for s in l2]
stop_time = time.time()
dt1 = stop_time - start_time
del l2
#~ print "Method A: %s seconds" % (dt1)
# Method B
start_time = time.time()
...
What is a “bundle” in an Android application
...ionContext(), SecondActivity.class);
intent.putExtra("myKey", AnyValue);
startActivity(intent);
You can get the passed values by doing:
Bundle extras = intent.getExtras();
String tmp = extras.getString("myKey");
You can find more info at:
android-using-bundle-for-sharing-variables and
Pass...