linux get filename from path

Assume a variable "y" which contains the absolute path. It is possible to get just the filename from a path in a bash shell script running on a Linux or Unix-like systems. When defining an environment variable, I get "Command not found", What would justify those road like structures. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. A descriptor can point to a deleted file (which therefore has no name, this is a common way of making temp files) or it may point to an inode with multiple names (hard links). Making statements based on opinion; back them up with references or personal experience. For that purpose, you use readdir (and opendir &c of course) recursively opening subdirectories until you find in a struct dirent thus received the same inode number you had in the original struct stat (at which time if you want the whole path, rather than just the name, you'll need to walk the chain of directories backwards to reconstruct it). rev 2021.3.12.38767, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Share If you do still need the functionality with all the limitations (on speed AND on the possibility of getting 0, 2, ... results rather than 1), here's how you can do it: first, fstat the FD -- this tells you, in the resulting struct stat, what device the file lives on, how many hard links it has, whether it's a special file, etc. I guess, the chosen answer should be given to zneak as his solution has better portability and has no noted access problems. pszPath. Are questions on theory useful in interviews? To learn more, see our tips on writing great answers. Of course, not all file descriptors refer to files, and for those you'll see some odd text strings, such as pipe:[1538488]. Understanding the behavior of C's preprocessor when a macro indirectly expands itself, How do network nodes "connect" - amateur level. Type: PTSTR. Is it possible to get the filename of a file descriptor (Linux) in C? We do, instead, have a F_GETPATH command for fcntl: So to get the file associated to a file descriptor, you can use this snippet: Since I never remember where MAXPATHLEN is defined, I thought PATH_MAX from syslimits would be fine. Making statements based on opinion; back them up with references or personal experience. If this general approach is acceptable, but you need more detailed C code, let us know, it won't be hard to write (though I'd rather not write it if it's useless, i.e. How can I use bash to get basename of filename or directory name for given path? FILENAME gives me the whole path. First one involves a suffix: basename PATH [suffix] I just tested this and it remains correct if the file is moved and you call it again (meaning: you get the new path of the file). How do I find a filename, given a FILE pointer? :) That's what I did when I had this same question myself a while back. the script on excution should take a directory path from useran a numric input and it should check indicate whether its write or not? The name of the file was opened — if the file was moved or deleted since then, it may no longer be accurate (although Linux can track renames in some cases). Edit: Assuming you are talking about a plain old POSIX system, without any OS-specific APIs, since you didn't specify an OS. Is there a Stan Lee reference in WandaVision? Linux has no facilities to do this. What is the difference between #include and #include “filename”? I really must work strings only, but thanks for the alternative. One can use any one of the following methods to extract filename or extension in bash. @uchuugaka Yes, everything is a file, but not everything is a, In : #define MAXPATHLEN PATH_MAX. microsoft.com/resources/documentation/windows/xp/all/proddocs/…, Podcast 320: Covid vaccine websites are frustrating. In this article we will discuss different ways to get filename from a path with or without extension using, Boost Filesystem Library; C++17 Filesystem Library Each time I mentioned, the answer became "switch away to an higher cost provider and you'll get /proc". How much of a jazz tune should I pre-arrange? Linux (POSIX) file descriptors don't necessarily refer to files, and even if they do they refer to inodes, not file names. Should we ask ambiguous questions on an exam? This is particularly helpful in bash scripts where you want to extract the file name from the long file path. Type: PTSTR. How to read a file line-by-line into a list? Using os.path.split or os.path.basename as others suggest won't work in all cases: if you're running the script on Linux and attempt to process a classic windows-style path, it will fail.. Windows paths can use either backslash or forward slash as path separator. This will give you the name of the file as it was when it was opened — however, if the file was moved or deleted since then, it may no longer be accurate (although Linux can track renames in some cases). How do I find all files containing specific text on Linux? BASENAME(3) Linux Programmer's Manual BASENAME(3) NAME top basename, dirname - parse pathname components SYNOPSIS top #include char *dirname(char *path); char *basename(char *path); DESCRIPTION top Warning: there are two different functions basename() - see below.The functions dirname() and basename() break a null-terminated pathname string into directory and filename … Thanks for contributing an answer to Stack Overflow! rev 2021.3.12.38767, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, @Marc that string is created with a loop, I think accessing 200-300 dirs isn't wise. Trying to find a sci-fi book series about getting stuck in VR. if 0 hard links you will KNOW there is in fact no corresponding filename on disk. Can I give "my colleagues weren't motivated" as a reason for leaving a company? Can I stabilize a character if I don't have proficiency in the Medicine skill or any healing equipment or abilities? A pointer to a null-terminated string of maximum length MAX_PATH that contains the path to search. How do I get the filename from this string? Get filename without Path First remove the full file path from input filename. To learn more, see our tips on writing great answers. @Tyler - lsof runs in userspace. Example: import os print() print(os.path.basename('E:\project-python\string\list.py')) print() @bdonlan : and in the case /proc is not mounted? Why is char[] preferred over String for passwords? If the stats give you hope, then you have to "walk the tree" of directories on the relevant device until you find all the hard links (or just the first one, if you don't need more than one and any one will do). Basically, you have 2 different methods: ClassLoader.getResourceAsStream() and Class.getResourceAsStream().These two methods will locate the resource differently. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You can use fstat() to get the file's inode by struct stat. Instants in response to your own abilities. What is the difference between String and string in C#? and how do i extract some part from string for eg abcd.txt if i want only abcd i can use cut -d"." How to check whether a string contains a substring in JavaScript? and take a substr to this point. this "some_executable_file" resides on many paths which r included in the PATH environment variable, so the output depicts only "some_executable_file" in the COMMAND column. I don't know if NetBSD supports procfs at all - if your shared host doesn't provide it, it's probably because NetBSD doesn't support it at all and uses another mechanism instead. Suppose you have a file path variable and you want to get the path to the directory that contains the file. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, ... Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Retrieve filename from file descriptor in C, permalink.gmane.org/gmane.linux.kernel/1302546, Podcast 320: Covid vaccine websites are frustrating. What is this part that came with my eggbeater pedals? Using dirname in bash script. You may want to post another question with a NetBSD focus to see if anyone knows how NetBSD exposes this information (you might want to also try zneak's answer below, OS X is more similar to BSD than Linux). We don't have a /proc virtual file system, so the accepted solution cannot work. There are indeed limitations, but saying it's impossible is just plain false. How to get file creation & modification date/times in Python? Searches a path for a file name. As a quick note today, if you’re ever writing a Linux shell script and need to get the filename from a complete (canonical) directory/file path, you can use the Linux basename command like this: $ basename /foo/bar/baz/foo.txt foo.txt How do I check whether a file exists without exceptions? I just needed this badly myself and, for that particular case (as parameter), it's much more shorter and elegant. As long as the original file still has references to it (an open. The new, flexible API offers more choices to that - learn how it works! site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. using commands to output path, filename and info to a txt file: bob_man_uk: Linux - General: 3: 05-11-2006 03:31 PM: how to seperate filename from path in perl: mengle: Programming: 2: 08-28-2005 02:35 AM: how do i get the path of the filename: linuxzouk: Programming: 25: 06-10-2004 09:00 AM: path and filename of compressed kernel ? Then, using readdir() you can compare the inode you found with those that exist (struct dirent) in a directory (assuming that you know the directory, otherwise you'll have to search the whole filesystem) and find the corresponding file name. You can use readlink on /proc/self/fd/NNN where NNN is the file descriptor. The whole purpose of the basename command is to retrieve filename out of a file path. Was there an organized violent campaign targeting whites ("white genocide") in South Africa? This may already answer your question -- e.g. Syntax: public static string GetFileName (string path); By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. The task is fairly simple as the base filename is just the part of the string starting at the last delimeter for folders: std::string base_filename = path.substr (path.find_last_of ("/\\") + 1) If the extension is to be removed as well the only thing to do is find the last . hi guys i give "ps -ef | grep some_executable_file" on the command line. Nasty? Join Stack Overflow to learn, share knowledge, and build your career. This method is used to get the file name and extension of the specified path string. @user2284570, this answer is Linux-specific. I need to extract file basename in bash running on Linux. Solution 2: /proc/self/fd/NNN where NNN is the file descriptor. you cannot withstand the inevitably slow performance or the possibility of getting != 1 result for the purposes of your application;-). Assuming you need the the names of files under the "c:\temp" directory tree (including sub-directories): Thanks for contributing an answer to Stack Overflow! Let us see how to extract the filename alone from the absolute path. In this article, we will see the different ways from which we can get the filename from an absolute path name. There are subtle differences as to how the fileName you are passing is interpreted. In Class.getResourceAsStream(path), the path is interpreted as a path local to the package of the class you are calling it from. Will Humbled Trader sessions be profitable? However this is not supported on linux (tested on Ubuntu 14.04 - F_GETPATH is not defined). @bdonlan : NetBSD support /proc but it's not mandatory to mount it. You can use readlink on /proc/self/fd/NNN where NNN is the file descriptor. Active guard shielding for instrumentation amplifier. GetFileName (String) Returns the file name and extension of the specified path string. I showed some examples of the dirname command. You may use the -z option to get the result in the same line with outputs separated by NULL character. Impossible. Asking for help, clarification, or responding to other answers. This developer built a…, State of the Stack: a new quarterly update on community and product, Convert list of paths to list of filenames. Introduction: One can extract filename and extension in bash shell using built-in commands or external commands.The ‘$’ character introduces parameter expansion, command substitution, or arithmetic expansion. The returned value is null if the file path is null. The basename command has two kinds of syntax. Can the Rats of a Hat of Vermin be valid candidates to make a Swarm of Rats from a Pipe of the Sewers? If you want to find all names for a given file, you'll just have to traverse the entire filesystem. A file descriptor may have multiple names in the filesystem, or it may have no name at all. How do I get directory name from its path on a Linux or Unix-like system? Unless it's a UNIX socket, it has no file associated. Looking on advice about culture shock and pursuing a career in industry, New DM on House Rules, concerning Nat20 & Rule of Cool. How do I include a JavaScript file in another JavaScript file? Method #1: Use dirname command to get directory name As Tyler points out, there's no way to do what you require "directly and reliably", since a given FD may correspond to 0 filenames (in various cases) or > 1 (multiple "hard links" is how the latter situation is generally described). Join Stack Overflow to learn, share knowledge, and build your career. How do I make the first letter of a string uppercase in JavaScript? Further, as others have noted, files can have multiple hardlinks pointing to them - this will only report the one it was opened with. How do network nodes "connect" - amateur level, Garbage Disposal - Water Shoots Up Non-Disposal Side. How to Extract the file name from a full path in bat? Is US Congressional spending “borrowing” money in the name of the public? path::has_root_path path::has_root_name path::has_root_directory path::has_relative_path path::has_parent_path path::has_filename path::has_stem path::has_extension $ echo $y /home/guru/perl/file.pl. @Duck, the portability there is probably why lsof's source has so much black magic; each UNIX variant does it differently. How to replace all occurrences of a string in Javascript? Therefore, the ntpath module (which is equivalent to os.path when running on windows) will work for all (1) paths on all platforms. To verify, stat the filename given and fstat … As I am i... Stack Exchange Network. Normally find command will retrieve the filename and its path as one string. perl : Extract filename from full path Posted on May 26, 2010 by Vishal Jain To extract the name of the file the quick way is to use substr and rindex commands to strip the path from filename … How can you get 13 pounds of coffee by using all three weights each trial? To be more specific, lsof is tightly coupled with the linux kernel, and doesn't do what it does by means of any API that is available to user-land code. To get the filename from a path in Python, we need to import os and then the path is added. Bash get filename from given path The basename … What is this tower with a gorgeous view toward Mount Fuji? Was there an organized violent campaign targeting whites ("white genocide") in South Africa? A Computer Science portal for geeks. Connect and share knowledge within a single location that is structured and easy to search. Let’s talk about using dirname in bash scripts. Postdoc in China. then my answer applies. as much as i hate windows, the windows equivalent is always nice to have. How to change permissions for a folder and its subfolders/files in one step? The linux proc interfaces aren't too bad, really, alebit rather sparsely documented. thanx (3 Replies) This will give you the name of the file as it was when it was opened — however, if the file was moved or deleted since then, it may no longer be accurate (although Linux can track renames in some cases). Physical explanation for a permanent rainbow. Asking for help, clarification, or responding to other answers. Changing Map Selection drawing priority in QGIS. In Windows, with GetFileInformationByHandleEx, passing FileNameInfo, you can retrieve the file name. How do I read / convert an InputStream into a String in Java? How to get only filename from find command in Linux? How to embed a file into an executable file? How can I get the new name of a renamed file given its file descriptor/object? It not supported on Ubuntu 14.04 (kernel 3.16.0-76-generic). Let me show it to you with some examples. get filename from absolute path in batch program hey im writing batch program for the first time and i have almost finished it the only problem is that i want to extract basename from absolute path for eg : if my first argument is c:\abcd\xyz\temp.txt then i want only temp.txt in variable. I'm guessing it's not supported on Linux at all. Since all of the real filenames will be absolute paths, you can determine which these are easily enough. Before writing this off as impossible I suggest you look at the source code of the lsof command. Basename command. What is the name of the retracting part of a dog lead? how can i get the full path? lsof works on black magic and sacrificial goats - you cannot hope to duplicate its behavior. The Linux pathname walking code (mostly in fs/namei.c) deals with all of these issues: breaking the path into components, handling the “everything else” quite separately from the final component, and checking that the trailing slash is not used where it isn’t permitted.It also addresses the important issue of concurrent access. How can I get my players to delegate to NPCs? What is the point in delaying the signing of legislation that the President supports? The Path interface is located in the java.nio.file package, so the fully qualified name of the Java Path interface is java.nio.file.Path. Use Python ntpath.basename () to Get the Filename From Path. So on Linux, r'usr/xyz\python' always refers to the file xyz\python in the usr folder. You change current directory with cd new_path and then run pwd to get the full path to the current directory. How to delete a file in Linux where all I have is the file descriptor. where you get the full path with new_path=$(dirname ${BASH_SOURCE[0]}). Is there a way to get the filename from a `FILE*`? There may be restrictions but lsof seems capable of determining the file descriptor and file name. if the cmmd sh,dir/path.<500>" is greater than 500 in … What do you roll to sleep in a hidden spot? I really tried to find this one before posting, but all the results were contaminated, they talk about getting filenames from current dir (I must work with strings only). I had this problem on Mac OS X. Syntax LPCSTR PathFindFileNameA( LPCSTR pszPath ); Parameters. So I'm looking for a procless solution. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A path can use to locate either a file or a directory.path of an entity could be of two types one is an absolute path and other is a relative path.