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Check if database exists in PostgreSQL using shell
...e special variable $? to the exit status of the last command. You can also test the status directly in a conditional:
if psql -lqt | cut -d \| -f 1 | grep -qw <db_name>; then
# database exists
# $? is 0
else
# ruh-roh
# $? is 1
fi
...
AngularJS : Clear $watch
... listen = $scope.$watch('mvIdentity.currentUser', function(currentUser) { test = 1; console.log("--> " + $scope.updateemail + " -- " + test); listen(); });
– Harshit Laddha
Jun 22 '14 at 5:28
...
JavaScript check if variable exists (is defined/initialized)
...
'if( variable )' also fails for testing for the existence of object properties.
– scotts
May 4 '10 at 22:40
55
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How to get datetime in JavaScript?
...er answers). The number of corner cases is astounding. Go look at the unit test page for moment.js (momentjs.com/tests) -- there are 66701 tests! Just use it, it's great. Or find another library, but don't write your own code for this, you will very likely miss something (I've messed this up royally...
Java FileOutputStream Create File if not exists
...oc), but it will create it if it can. To be sure you probably should first test that the file exists before you create the FileOutputStream (and create with createNewFile() if it doesn't):
File yourFile = new File("score.txt");
yourFile.createNewFile(); // if file already exists will do nothing
Fi...
How do I get both STDOUT and STDERR to go to the terminal and a log file?
...
#!/usr/bin/env bash
exec > >(tee -a $HOME/logfile) 2>&1
# Test redirection of STDOUT
echo test_stdout
# Test redirection of STDERR
ls test_stderr___this_file_does_not_exist
(Note: This only works with Bash. It will not work with /bin/sh.)
Adapted from here; the original did n...
Accessing an SQLite Database in Swift
...omainMask, appropriateFor: nil, create: true)
.appendingPathComponent("test.sqlite")
// open database
var db: OpaquePointer?
guard sqlite3_open(fileURL.path, &db) == SQLITE_OK else {
print("error opening database")
sqlite3_close(db)
db = nil
return
}
Note, I know it seems...
Is it safe to assume a GUID will always be unique?
...GUIDs (for example), would it be safe to assume they're all unique to save testing each one?
6 Answers
...
Trouble comparing time with RSpec
... I think this answer is better because it expresses the intent of the test, rather than obscuring it behind some unrelated methods like to_s. Also, to_i and to_s might fail infrequently if the time is near the end of a second.
– B Seven
Dec 14 '14 at 20:12...
Cannot create or edit Android Virtual Devices (AVD) from Eclipse, ADT 22.6
...1.7 Update 51 and Eclipse Standard SDK to Kepler Service Release 2 their latest and no resolution to the problems. Also tested under Debian and same results obtained.
Update 5
At https://code.google.com/p/android/issues/detail?id=66661 android project members conforms the problems and promises to ...