Use this tag for questions about file management and operations on files.

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1
vote
4answers
34 views

Command line 'buffer'

I wanted to tail the last 100 lines of a file to the same file, but the command tail -n 100 file > file doesn't work, I assume because the stdout gets written to the file 'live', before everything ...
0
votes
1answer
17 views

Can I safely delete old directories in my home directory?

I have several hidden directories in my home directory of which I don't know if I need them any more. How do I know if I can safely delete them? For instance, next to the directory .gimp-2.8 there is ...
19
votes
8answers
1k views

How to delete this undeletable directory?

I untarred a corrupt tar file, and managed to end up with some directory that I can not delete, If I try to delete it, it seems like it can not be found, but ls shows it's present, both with bash and ...
1
vote
1answer
20 views

What relationships do tie ACL mask and standard group permission on a file?

At first I create a file and check it's standard permissions and ACL entries: $ touch file; ls -l file; getfacl file -rw-r--r-- 1 user user 0 Jul 30 16:26 file # file: file # owner: user # group: ...
6
votes
4answers
99 views

Find newest file. Multiple Filetype restrictions

I want to write a command that gives me the newest file in a directory recursively. But that's not my only limitation. The files has to be an mp3 or a jpg file. (case insensitive prefered) I only need ...
2
votes
1answer
30 views

What is advisory locking on files that Unix systems typically employs?

I read that Unix like system typically use advisory locking for file IO vs mandatory locking used by Microsoft OS's. If I understood correctly in mandatory locking file lock is enforced by the OS ...
2
votes
4answers
94 views

Change to the last modified subdirectory of the current directory

I have an application which generates a couple of files in different directories at a regular interval and I need to check the latest files generated, i.e. the file which is generated in the most ...
0
votes
0answers
8 views

How to programmatically read until a certain character in a file? [migrated]

My C program writes a .json file. Few of the values in the schema of the .json file is string and has variable length. I am using jansson library. I will have to read a complete .json object ...
-1
votes
3answers
44 views

cat /dev/null emptied my log file but size did not change

I'm quite new to Unix. Using Solaris 10 I faced the below issue. There is a large log file with size 9.5G. I tried to empty the file using the below command. # cat /dev/null file_log.txt By doing ...
3
votes
3answers
131 views

filename and pathname of a file

It is said that the filename of a file is a pointer pointing to the inode of the file. Before knowing that, I thought it was the pathname of a file that does that job. I am not sure how a pathname ...
-1
votes
1answer
19 views

A command showing if I have the right to perform writing?

I'm searching for a command which only says if the current user has r-rights (read) on the file passed as a parameter. This command could be something like haveIRights -x <file> and it has to ...
3
votes
1answer
40 views

Default files in home dir for each user

I'm using ubuntu server 14.04. I want to add some files and folders by default in each user's home directory, whenever a user account is created.
5
votes
4answers
215 views

Ways to organize and access frequently visited directories and files?

In my Ubuntu, I have added some frequented directories to the bookmarks of Nautilus, for visiting them quicker. Nautilus can consume a lot of memory, when it has been kept open for long and there ...
7
votes
3answers
606 views

How can a log program continue to log to a deleted file?

From the Unix Power Tools, 3rd Edition: Instead of Removing a File, Empty It section: If an active process has the file open (not uncommon for log files), removing the file and creating a new ...
-1
votes
1answer
24 views

Is %a an option of stat?

Usage: stat [OPTION]... FILE... Display file or file system status. -L, --dereference follow links -f, --file-system display file system status instead of file status -c ...
3
votes
1answer
58 views

How does `stdin` of linux work?

I know that stdin refers to standard input in linux, usually the keyboard. It can also be referred by file descriptor 0. So, which file descriptor does the (standard input) mouse refer to? Or is it a ...
2
votes
3answers
80 views

Count files in a directory by extension

For the purpose of testing, I'd like count how many images files are inside a directory, separating each image file type by file extension (jpg="yes". This because later it will be useful for another ...
3
votes
3answers
82 views

Copy a file and overwrite the existing file

I have two images (image1.png and image2.png) in the same folder on my server, I want to run a command that overwrites image2.png to image1.png. I prefer to overwrite the image instead of deleting it ...
4
votes
2answers
188 views

Should /usr owner be root?

After having installed the MySQL database on openSUSE I realized that for all files in /usr/bin the owner was changed to the "mysql" user of the "mysql" group. Maybe there was some mistake of mine. ...
2
votes
1answer
928 views

Sphinx Search shutting down after `FATAL: accept() failed: Too many open files`

I'm running Sphinx Search Server V2.06 ( the latest stable release ) on an Amazon EC2 with Linux CentOS. In general it is running fine, but the searchd.log is showing this error over and over with ...
2
votes
0answers
40 views

Removing duplicate files but ignoring certain lines (e.g. embedded timestamp)

I have a bunch of gzipped text files. I am trying to remove duplicate files (using fdupes) but the problem is these files contain a line that has their timestamp in them, and the files are identical ...
3
votes
2answers
110 views

Valgrind /usr/lib files are not regular Linux files

The problem that I encountered today (on an embedded device with Linux) is that some files (specifically, the Valgrind /usr/lib files) are behaving very strange and they are not copy-able with scp ...
18
votes
4answers
6k views

How to properly and easy configure `xdg-open` without any enviroment?

I'm using OpenBox window manager without any desktop enviroment. xdg-open behaves strangely. It opens everything with firefox. $ xdg-settings --list Known properties: default-web-browser ...
1
vote
1answer
10 views

Unzip all non-existing or older files from archive

The behaviour I'd like with unzip is to extract all files, overwriting any that are older than those in the archive, not touching any that are the same age or newer, and to never prompt. The options ...
14
votes
5answers
20k views

Script to monitor folder for new files?

How do I detect new files in a folder with a bash script? I would like to process the files as soon as they are created in the folder. Is this possible to do so or do I have to schedule a script with ...
3
votes
2answers
37 views

fdupes - delete files after comparing two directories

I'm currently trying to solve an issue using fdupes. I'd like to compare two folders with each other, and afterwards delete all duplicate files within one of these directories. Example: Files are ...
38
votes
8answers
21k views

How can I edit multiple files in VIM?

I know I can open multiple files with vim by doing something like vim 2011-12*.log, but how can I switch between files and close the files one at a time? Also, how can I tell the file name of the ...
4
votes
1answer
19 views

. (dot) in file mode [duplicate]

I tar a folder on windows and untar on RHEL machine. ls -l shows a . in file mode and folders are in blue + yellow background. [root@xt-storage-01 apache-tomcat-8.0.5]# ls -l total 120 drwxrwxrwx. 2 ...
5
votes
2answers
268 views

How is the inplace modification of a file being done?

What does the "inplace" modification of a file e.g. via sed -i or perl -i mean? My question is about how this inplace modification is done. Is the file copied the modification is done in the copy and ...
4
votes
2answers
137 views

Faster way to rename duplicate files (identified by fdupes) in another directory?

I have a directory full of pdf files of journal articles, most of which are named by their bibtex key. Some time ago I made a backup on an external hard drive, but I haven't kept it up to date and ...
9
votes
4answers
3k views

Is there a way of deleting duplicates more refined than fdupes -rdN?

Recently I have the need to delete a lot of duplicates. I am merging three or four filesystems, and I want the space to be used economically. At first, fdupes seemed like it was the best tool for the ...
5
votes
2answers
131 views

File handles and filenames

I read this post. Are file descriptors the same as file handle? While trying to configure the linux kernel, it asks open by fhandle syscalls (FHANDLE) [Y/n/?]. Why is this option provided? Does ...
1
vote
1answer
25 views

How to find which application is creating a particular file in a path? [duplicate]

The issue is that, one particular flat file is getting created in a directory. I'm not sure which application is creating that flat file. I am using Unix environment. Is there any possibility to ...
0
votes
1answer
26 views

Give a user the permission to access files in a directory

I have mounted a volume from NAS storage to my Solaris 10 machine using NFS. I want to give read/write permission for a user to the directories and subdirectories and files. I have tried setfacl -m ...
3
votes
1answer
41 views

How do I use sudo to run multiple commands as another user within a portion of a script?

I'm trying to run the following: if [! -f .owner ]; then creator=$(whoami) sudo -u appuser ksh echo "$creator" >> .owner mkdir test1 test2 test3 exit fi However, the ...
1
vote
2answers
118 views

How would I change file permissions if the file name has a space in it in linux [duplicate]

I would like to know how would I rename and change file permissions of a file that contains a space in the name on Linux. Example The name of my file is: my file I have tried mv my%20file my_file ...
14
votes
3answers
5k views

How to list files that were changed in a certain range of time?

How can I list recursively all files that were changed between 22.12.2011 and 24.12.2011?
-1
votes
4answers
93 views

Need a command sequence that will move files from one directory to another based on a particular year? [duplicate]

I'm looking for a sequence of commands (one liner would be ideal) which will identify all the files created in particular year, and move the resulting files to another directory.
3
votes
1answer
23 views

Can close() block?

For example, if you close a pipe or socket that still has data in its write buffer that hasn't been read by the process on the other end, does close() block until the data is read or the other process ...
8
votes
4answers
591 views

Why does “cat ttyUSB0” not produce output?

I connected an infrared receiver to a USB port ... (the last line of dmesg tells device file) $ dmesg [10496.596063] usb 7-2: new full-speed USB device number 2 using uhci_hcd [10496.751112] usb 7-2: ...
36
votes
5answers
18k views

How to remove duplicate lines inside a text file?

A huge (up to 2 GiB) text file of mine contains about 100 exact duplicates of every line in it (useless in my case, as the file is a CSV-like data table). What I need is to remove all the repetitions ...
2
votes
2answers
117 views

Difference between `ls -c` and `ls -t`

What is the difference between -c and -t options for the ls Unix command? And how can I sort by date of creation with the ls command?
1
vote
0answers
21 views

Recover deleted files on Raspberry Pi? [duplicate]

So I just rm -rf'ed a folder with a few files I need. Yes I know I should've had a backup, but it's just a Pi. It's designed to be played around with! Is there anything I can do to recover that ...
6
votes
2answers
277 views

How to find out which program can open a given file?

Let's say I have a file thesis.pdf or picture.jpg Is there a command which returns a program to open this file with? I am aware of the command file, but it just returns the correct type of the file ...
4
votes
2answers
62 views

How to redirect stdout to a file and read from the same file simultaneously with another task?

I want to run a task (which takes quite a long time) remotely in Ubuntu Linux Bash via nohup and redirect stdout to a file, e.g.: nohup task > out.txt & From time to time I would like to ...
4
votes
1answer
119 views

FILE size limitation according to Robert Love's textbook

From Robert Love's Linux System Programming (2007, O'Reilly), this is what is given in the first paragraph (Chapter 1, Page 10): The file position’s maximum value is bounded only by the size of ...
22
votes
5answers
12k views

Determine which process is creating a file

Given file path, how can I determine which process creates it (and/or reads/writes to it)?
3
votes
2answers
45 views

The reverse of `tree` - reconstruct file and directory structure from text file contents?

We all know we can use tree to get a nicely formatted text "visualization" of the structure of a directory; say: $ tree -spugD /usr/include/boost/accumulators/numeric/ ...
1
vote
2answers
32 views

scp and file owner

What are the reasons that could make a change in a file ownership after scp'ing it from one server to another? The file ownership changed from 'owner' to 'apache'. I used scp -p . The user 'owner' ...
1
vote
4answers
594 views

Solaris 10 : Remove trailing blank lines from multiple files

I'm working on Solaris 10.What is the easiest way to remove blank lines from multiple files at once?