ext3

Command to truncate all filenames at 255 characters

由 限于喜欢 提交于 2021-02-08 11:11:43
问题 An NTFS directory is open in a bash shell. what command will recursively truncate all filenames in a directory to the 255 character limit required for ext3? 回答1: If you have access to a Windows shell, you can use: @echo off setlocal EnableDelayedExpansion REM loop over all files in the cwd for /f %%a in ('dir /a-d /b') do ( REM store this filename in a variable so we can do substringing set ThisFileName=%%a REM now take a substring set ThisShortFileName=!ThisFileName:~0,255! REM finally, the

Command to truncate all filenames at 255 characters

由 寵の児 提交于 2021-02-08 11:09:28
问题 An NTFS directory is open in a bash shell. what command will recursively truncate all filenames in a directory to the 255 character limit required for ext3? 回答1: If you have access to a Windows shell, you can use: @echo off setlocal EnableDelayedExpansion REM loop over all files in the cwd for /f %%a in ('dir /a-d /b') do ( REM store this filename in a variable so we can do substringing set ThisFileName=%%a REM now take a substring set ThisShortFileName=!ThisFileName:~0,255! REM finally, the

How to quickly create large files in C?

由 孤者浪人 提交于 2020-06-17 13:12:46
问题 I am doing research on file system performance, and I am stumped on how to create a very large file very quickly in C. Basically, I am trying to re-create a file system's folders and files by taking this metadata and storing it into a file. This is the extraction process. Later, I want to restore those folders and files into an existing freshly-made file system (in this case, ext3) using the metadata I previously extracted. In the restore process, I have already succeeded in creating all the

Is there an official specification for the ext2/ext3/ext4 filesystems?

由 被刻印的时光 ゝ 提交于 2020-01-15 03:24:15
问题 I was wondering, for Bluetooth we have IEEE 802.15.1 standard, managed by Bluetooth Special Interest Group. For Wifi we have the IEEE 802.11 standards and also the Wifi Alliance. For NVMe SSDs on PCIe we have nvmexpress that regulate and publish its official documentation. So, usually there is a regulatory agency who decides things and standardize how some things should be to allow interoperability between several different implementations. But for the ext2/ext3/ext4 filesystems I didn't find

How do I create a file with a specific inode number?

由 大城市里の小女人 提交于 2019-12-13 12:24:54
问题 How can I create a file in ext3 filesystem with a specific inode number? (ex: I want to create a file with inode-number = 12253) 回答1: I don't think there's any programmatic way to request a specific inode number when creating a file from userspace. Other than being visible in stat() results, inode numbers have no significance in userspace; they're part of the filesystem's internal bookkeeping data, just like the block numbers where the file contents are allocated. You could probably use

How to manage Linux file permissions in Java?

由 半腔热情 提交于 2019-12-10 10:09:28
问题 Is there any mechanism to get and set the file/directory permissions? For example, I want to show the permisssions of a file in a shell way: -rwxr-xr-- Is it possible to do this using Java? I know that there are some methods in the File class to know if the file canExecute , canRead and canWrite , but AFAIK this info is for the current user only. I need to know the whole octal number, for example 755, so I need to get it from the user, from group and from others. I know that Java7 brings

Fast way to find the number of files in one directory on Linux

由 孤街醉人 提交于 2019-12-07 16:51:41
问题 I am looking for a fast way to find the number of files in a directory on Linux. Any solution that takes linear time in the number of files in the directory is NOT acceptable (e.g. "ls | wc -l" and similar things) because it would take a prohibitively long amount of time (there are tens or maybe hundreds of millions of files in the directory). I'm sure the number of files in the directory must be stored as a simple number somewhere in the filesystem structure (inode perhaps?), as part of the

How to manage Linux file permissions in Java?

由 纵然是瞬间 提交于 2019-12-05 20:39:32
Is there any mechanism to get and set the file/directory permissions? For example, I want to show the permisssions of a file in a shell way: -rwxr-xr-- Is it possible to do this using Java? I know that there are some methods in the File class to know if the file canExecute , canRead and canWrite , but AFAIK this info is for the current user only. I need to know the whole octal number, for example 755, so I need to get it from the user, from group and from others. I know that Java7 brings Posix operations, but how could do this using a smaller JRE? I would like not to use a command like ls , or

How do I create a file with a specific inode number?

由 这一生的挚爱 提交于 2019-12-04 23:49:49
How can I create a file in ext3 filesystem with a specific inode number? (ex: I want to create a file with inode-number = 12253) I don't think there's any programmatic way to request a specific inode number when creating a file from userspace. Other than being visible in stat() results, inode numbers have no significance in userspace; they're part of the filesystem's internal bookkeeping data, just like the block numbers where the file contents are allocated. You could probably use debugfs to "change" an existing file's inode number, by copying the contents of one inode to another, then
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