A backup script that runs on several Linux systems recently produced the following error:
ls: cannot access '/tmp/sortrq9hq8': No such file or directory
It happens every time the backup runs. Other than the above message, there seems to be no ill effect on the backup, which completes successfully. The ls command did not find a file that it expected to be there.
This article explains how the missing file was created by the Linux sort command as a temporary storage area, how error messages about these files are likely to crop up from time to time, how to reproduce the error, and some background about the behaviour of the sort command on Linux and Solaris. Continue reading →
In Perl, hash (associative array) sorting is a common and easy practice. Sorting values by key is easy. And so is sorting by value. But how do you sort the values of a hash by key? One answer is to use a hash slice. Continue reading →
The “sort” command on Solaris has a “-k” switch for sorting by a particular field. For example, “sort -k 2” will sort by the second field on each line of input. Parts of fields can be further specified with “-k n.m“, says the man page.
For example, “sort -k 2.3” should sort by the second field, starting with the third character in that field. But the man page isn’t the clearest, and getting the “-k x.y” notation to work is tricky. Tricky until you realize it never works you also supply the “-b” argument. Same on Linux. Continue reading →
The venerable fat16 and fat32 file systems are still in widespread use today. Devices such as digital cameras, satellite navigation systems, memory sticks and mp3 players all make use of FAT.
The files in a FAT file system are arranged in a strict order. This can affect the way that some devices behave. For example, some MP3 players will play songs only in the order in which they are arranged on the device, rather than the more convenient alphabetical or alphanumeric order. Music players that use USB memory sticks and in-car USB systems can be affected in the same way. The only way to get the songs to play in a more sensible order is to sort the directory (folder) in which they are located. Continue reading →