What you’re doing seems perfectly OK, provided you’re using the POSIX “raw” IO syscalls such as read(), write(), lseek() and so forth. If you use C stdio (fread(), fwrite() and friends) or some other language runtime library which has its own userspace buffering, then the answer by “Tilo” is relevant, in that due to the … Read more
The ls -l command will show you that: $ ls -l foo lrwxrwxrwx 1 user group 11 2010-12-31 19:49 foo -> /etc/passwd Or the readlink command: $ readlink foo /etc/passwd So, the symbolic link foo points to the path /etc/passwd.
I usually access the directory that contains my application’s .exe with: System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location);
Here’s a sketch. Error handling is left as an exercise for the reader. var fs = require(‘fs’), path = require(‘path’) function dirTree(filename) { var stats = fs.lstatSync(filename), info = { path: filename, name: path.basename(filename) }; if (stats.isDirectory()) { info.type = “folder”; info.children = fs.readdirSync(filename).map(function(child) { return dirTree(filename + “https://stackoverflow.com/” + child); }); } else { … Read more
TL;DR There is an analogy with a cold engine and warm engine of the car. Cold cache – doesn’t have any values and can’t give you any speedup because, well, it’s empty. Warm cache has some values and can give you that speedup. A cache is a structure that holds some values (inodes, memory pages, … Read more
There are three kinds of writable paths to consider – the first is Documents, where you store things you want to keep and make available to the user through iTunes (as of 3.2): NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; Secondly, and very similar to the Documents directory, there is the … Read more
function GetDirectorySize($path){ $bytestotal = 0; $path = realpath($path); if($path!==false && $path!=” && file_exists($path)){ foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS)) as $object){ $bytestotal += $object->getSize(); } } return $bytestotal; } The same idea as Janith Chinthana suggested. With a few fixes: Converts $path to realpath Performs iteration only if path is valid and folder exists Skips . and … Read more
Use os.path.expandvars to expand the environment variables in the string, for example: >>> os.path.expandvars(‘$C/test/testing’) ‘/stackoverflow/test/testing’
Most filesystems (but not all) use locking to guard concurrent access to the same file. The lock can be exclusive, so the first user to get the lock gets access – subsequent users get a “access denied” error. In your example scenario, user A will be able to read the file and gets the file … Read more
Such difference between the output of du -sh and df -h may happen if some large file has been deleted, but is still opened by some process. Check with the command lsof | grep deleted to see which processes have opened descriptors to deleted files. You can restart the process and the space will be … Read more