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Check Whether a User Exists
...t, you got command return value ($?)1
And as other answers pointed out: if all you want is just to check if the user exists, use if with id directly, as if already checks for the exit code. There's no need to fiddle with strings, [, $? or $():
if id "$1" &>/dev/null; then
echo 'user found...
How to dynamically create generic C# object using reflection? [duplicate]
...create the object, just for the sake or creating it. You probably want to call some method on your newly created instance.
You'll then need something like an interface :
public interface ITask
{
void Process(object o);
}
public class Task<T> : ITask
{
void ITask.Process(object o)
...
Automatic exit from bash shell script on error [duplicate]
...u can also disable this behavior with set +e.
You may also want to employ all or some of the the -e -u -x and -o pipefail options like so:
set -euxo pipefail
-e exits on error, -u errors on undefined variables, and -o (for option) pipefail exits on command pipe failures. Some gotchas and workaro...
How to add a delay for a 2 or 3 seconds [closed]
...swered Mar 27 '11 at 14:46
digEmAlldigEmAll
51.9k99 gold badges106106 silver badges131131 bronze badges
...
Creating a UIImage from a UIColor to use as a background image for UIButton [duplicate]
...'re trying to apply; the CGColor is backed by that UIColor, but ARC will deallocate the UIColor before you have a chance to use the CGColor.
The clearest solution is to have a local variable pointing to your UIColor with the objc_precise_lifetime attribute.
You can read more about this exact cas...
“Unicode Error ”unicodeescape" codec can't decode bytes… Cannot open text files in Python 3 [duplica
...owed by the character 's', which is invalid.
You either need to duplicate all backslashes:
"C:\\Users\\Eric\\Desktop\\beeline.txt"
Or prefix the string with r (to produce a raw string):
r"C:\Users\Eric\Desktop\beeline.txt"
...
How do you Force Garbage Collection from the Shell?
... java.lang:type=Memory
#bean is set to java.lang:type=Memory
$>run gc
#calling operation gc of mbean java.lang:type=Memory
#operation returns:
null
$>quit
#bye
Look at the docs on the jmxterm web site for information about embedding this in bash/perl/ruby/other scripts. I've used popen2 in ...
Disabling the fullscreen editing view for soft keyboard input in landscape?
...
I finally answered my own question:
The extract UI (i.e. the fullscreen editing mode) can be disabled at the point at which the input connection is hooked up:
@Override
public InputConnection onCreateInputConnection(EditorInfo o...
how to convert java string to Date object [duplicate]
...
You basically effectively converted your date in a string format to a date object. If you print it out at that point, you will get the standard date formatting output. In order to format it after that, you then need to convert it back...
OS specific instructions in CMAKE: How to?
...
Ah, found this. It mentions UNIX, WIN32, and presumably all their "peers": cmake.org/Wiki/CMake_Checking_Platform
– rchilton1980
Nov 29 '17 at 17:35
...