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

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1
vote
1answer
2k views

How to trace file locks (per directory)

I'm quite new to Linux and I have not really a clue on how to do this. I've got a directory and I'd like to monitor (output to shell) when a file inside that directory get's a file lock and when it ...
4
votes
0answers
160 views

Repeatably generate a read error for testing? [duplicate]

I'm trying to test the error handling in some software, in particular what happens when an error occurs reading from a file or pipe. Is there a simple way to send a certain amount of data to stdout ...
2
votes
2answers
5k views

How to make tree output only directories?

150 directories I can handle but 900 files is too many for a review. I've no manual entry for tree so maybe I can ask you if you know how to output only directories since files get too detailed? . ...
10
votes
5answers
4k views

What's so special about directories whose names begin with a dot?

I was wondering what the difference between these two were: ~/somedirectory/file.txt and ~/.somedirectory/file.txt It's really difficult to ask this on Google since I didn't know how to explain ...
8
votes
3answers
1k views

How can I exclude files by default with rsync?

How can I exclude files by default with rsync? Here is how my normal rsync syntax starts out: rsync --exclude ".ht*" --exclude "error_log" --exclude ".DS*" --exclude "old" ... I've seen a lot of ...
0
votes
2answers
166 views

+x permission for files in directory

I'm an Ubuntu user and I'd like to change default permissions for downloaded files. Currentely all downloaded files are automatically saved with "-rw-r--r--" permissions (umask 0022). I'd like to add ...
2
votes
1answer
4k views

Is the file table in the filesystem or in memory?

In the context of operating system control tables, does the term "file tables" refer to a data structure that is part of the filesystem, or that is in main memory (and in which case I assume it would ...
3
votes
2answers
515 views

On touching a new file why is mtime and ctime older than atime?

I have this: $ ls -l ff ls: cannot access ff: No such file or directory $ touch ff $ stat ff File: `ff' Size: 0 Blocks: 0 IO Block: 4096 regular empty file Device: ...
2
votes
4answers
181 views

Lines 1,2,3,4,…,n-1, n to lines n,n-1, …,4,3,2,1

I just realized that I could solve this problem by reversing line numbers from 1, 2, 3,...,n to n, n-1, ..., 3,2,1 and then use the same logic as earlier. So I want to know how can I reverse the order ...
2
votes
4answers
2k views

SAMBA Share - Keep user from deleting a file

I'm creating a hidden "Access Log" .txt file of employees accessing a program I've created and need to know how to make it so this file cannot be deleted. Reason being, this program helps to automate ...
2
votes
2answers
783 views

Comparing files and their properties

I get information of a certain set of files in my mail every day, which looks like this: 58623208 Sep 14 20:08 blbn_blfbe_drv 57904920 Sep 14 19:54 blbn_cycmn 55814208 Sep 14 06:02 clsa_Upd 38912000 ...
29
votes
4answers
13k views

Clone ownership and permissions from another file?

Is there a command or flag to clone the user/group ownership and permissions on a file from another file? To make the perms and ownership exactly "like" that of another file?
40
votes
2answers
40k views

How do I do a ls and then sort the results by date created?

In what order are the dated ordered by? Certainly not alphanumeric order. ls -lt sorts by modification time. But I need creation time.
5
votes
2answers
956 views

More sophisticated file command for deep inspection?

Sometimes it seems that the standard file command (5.04 on my Ubuntu system) is not sophisticated enough (or I am just using it wrong, which could well be). For example when I run it on an .exe file, ...
2
votes
2answers
200 views

Splitting giant files into a specific number of lines

I have a CSV that is 40 000 lines long. What is the simplest tool to read from line x to line y? I am sure there are more professional ways to do it but I would just like a bash script that works in ...
9
votes
3answers
2k views

Why is sorting files by access time not working?

I tried to use command ls --time=atime it was working in one directory but wasn't working in another directory. I opened certain files in vim, evince and other applications but after the command file ...
4
votes
3answers
366 views

Delete files in a directory which are also in another directory

I copied a directory using this: cp -r dir/ ../../ without thinking and realized that it copied the contents of dir instead of actually dir to the above directory. Now I have a mess of files I need ...
0
votes
1answer
397 views

Listing only the files in a folder and inside its subfolders

Is there a linux command for getting only the files in a folder and inside its subfolders? I have used the find command, but it is displaying all the files and folders. I am executing this shell ...
3
votes
2answers
380 views

Organizing messy folder based on filetype

I have music lying on my desktop and in my downloads and Music folders. Similarly, I have .odt files lying all over my home folder (mainly desktop). Is there a tool (preferably GUI so my parents can ...
2
votes
3answers
647 views

Rename files with random characters from sha1sum. Does it unique?

I'm using this command to rename files with random characters from sha1sum and move all files from subdirectories to current directory: for fname in `find . -type f`; do mv "$fname" $(echo "$fname" | ...
4
votes
2answers
2k views

Tell if a folder/file is hidden in Mac OS X

I know you can set or unset the hidden flag of a folder/file by doing chflags hidden foo.txt and chflags nohidden foo.txt. But is there anyway of telling whether the folder/file is currently hidden ...
20
votes
3answers
10k views

List the files accessed by a program

time is a brilliant command if you want to figure out how much CPU time a given command takes. I am looking for something similar that can list the files being accessed by a program and its children. ...
54
votes
4answers
15k views

What's the point in adding a new line to the end of a file?

Some compilers (especially C or C++ ones) give you warnings about: No new line at end of file I thought this would be a C-programmers-only problem, but github displays a message in the commit view: ...
4
votes
2answers
2k views

Access history of a file [duplicate]

I was wondering if there are any tools to keep track of the access history of a file. I know of stat, but as far as I understand, it only returns information about the last time the file was accessed. ...
2
votes
1answer
952 views

Can't see files on my cell phone

I have Samsung Galaxy S2 as my cell phone and Debian Squeeze as my desktop. When I connect them using USB, Debian recognize it and allows to open it with file manager. Problem: it displays only ...
9
votes
4answers
5k views

How are directories implemented in Unix filesystems?

My question is how directories are implemented? I can believe a data structure like a variable e.g. table, array or similar. Since UNIX is Open Source I can look in the source what the program does ...
17
votes
2answers
4k views

recursive statistics on file types in directory?

I did a website scrape for a conversion project. I'd like to do some statistics on the types of files in there -- for instance, 400 .html files, 100 .gif, etc. What's an easy way to do this? It has to ...
7
votes
3answers
13k views

Correct permissions for /var/www/html?

I'm able to write changes in the home directory, but when it comes to the /var/www/html folder, it's not allowing me to make any changes or create new files or folders. I'm able to view the files in ...
4
votes
3answers
12k views

How to recursively list all hidden files and directories?

I want to list all hidden files and directories and then save result to file. Is there any command for this?
2
votes
2answers
1k views

How to find human-readable information about file types recognized by `file`?

Searching, googling, I could not find any information about file types recognized by file. For example, an *.mp4 file is identified as "ISO Media" (while being able to play with VLC normally). This ...
5
votes
2answers
249 views

Is there a web site to search in the file contents of default installations of different linux distributions?

The text string "Network services, Internet style" is found in the first line of the file /etc/services on a computer running Ubuntu 11.04 erik@laptop:~$ head -1 /etc/services # Network services, ...
3
votes
3answers
376 views

How to grep recursive UNIX tree results along with each tree node?

Here is what I do tree -R /Applications/NetBeans/NetBeans\ 7.0.app/ | perl -e 'while (<>) { print if /java$/ }' but of course this doesn't return the result I want. What I want is to display ...
4
votes
2answers
325 views

Sometimes I feel like a directory, some times I feel like a regular file

For organizational purposes I would like a certain filesystem object which most of the time appears as a file, on occasion, to appear as a directory. The basic idea is that generically for cp, mv, ...
4
votes
3answers
3k views

Delete files based on year

I need to delete all files in a directory that were created in 2009. What command can I use to do that?
1
vote
1answer
1k views

Automount lookup failed. How to determine what is trying to access the file?

Is there a way to find out what is trying to mount this file? Jul 13 14:27:24 myhost automount[13527]: lookup(file): lookup for tmp_dir failed Something is looking for "tmp_dir", and I've ...
31
votes
7answers
51k views

How can I get the size of a file in a bash script?

How can I get the size of a file in a bash script? How do I assign this to a bash variable so I can use it later?
3
votes
2answers
118 views

Can I run a command with specific privileges on certain directories?

I would like to be able to run a command, passing in parameters to bash or similar, such that this command is not allowed to write to a particular path, overriding the user's other privs. Eg: ...
2
votes
1answer
138 views

Is there a way to determine which process creates a file on osx 10.6.8

I would like to know which process has created files on os X 10.6. I'm trying DTrace, which probably will give the right answer, but I have not eyes to see the method. I'm doing this because I think ...
9
votes
2answers
2k views

How can I delete all files in a folder that haven't been accessed in a certain amount of time?

I'd like to run a nightly cron job that deletes all the files in a folder that haven't been accessed in a week or more. What is the most efficient way to do this in bash?
5
votes
3answers
5k views

How do I open a .bak file on Linux?

I have received a file of .bak format, let it be foo.bak. I don't know if it is a MS-DOS file or Linux/Unix file. What I know is that I can't open it because my Linux (Ubuntu) does not give any hint ...
7
votes
3answers
5k views

How can I limit downloaded file size in wget?

I want to use wget (from a php script) to download image files, but don't want to download files over a certain size. Can I limit file size with wget? If not, what is a better way?
1
vote
2answers
1k views

permission denied when executing a binary

I used these instructions to install mongodb on my OS X machine. I did not make the files owned by root though, I used my local user (markdsievers), and installed to /usr/local/mongodb and ...
3
votes
1answer
102 views

What are core.mountd.######### files? OpenSolaris

I and gaining an ever expanding list of of core.mountd.12009999475 type files in my root directory? What are these? Can I just delete them? What causes them to be created?
5
votes
6answers
31k views

How to transfer files from Windows to Ubuntu on Virtualbox?

How should I transfer files from Windows to Ubuntu installed on Virtualbox? When I plugged in a USB, it only pops up in Windows. How can I see it in Ubuntu?
3
votes
4answers
5k views

Find file by a part of its content

I have many files in a specific repository and i must find a file which has a specific string in its content (actually referencing the file Version.cc.in). What is the best solution to find it?
2
votes
1answer
1k views

remove carriage return character from large binary file

I have a large binary file ( nearly binary file ! ) which has many \r\n in it [ gets Generated in windows env and doesnt have controle over generating application ]. I want to remove \r from this ...
2
votes
1answer
18k views

How to move a file to /usr/local in Ubuntu?

I am working in the most recent Ubuntu in a 64 bit machine. I am currently on the Gnome command prompt and I am trying to move a file under the Downloads directory to /usr/local. However, it gives me ...
1
vote
4answers
489 views

Fast incremental searching of files from shell

I like the command-t script in vim editor that is able to intelligently and incrementally search for files. Is there some similar program that is able to search from shell? It would be great if it ...
4
votes
2answers
1k views

undelete files from local fileserver

I have a NAS (mybook world white light) in my living room where all my music and stuff is stored. I've mounted the music folder of the nas in the local music folder of my home directory on my desktop ...
12
votes
3answers
9k views

Delete the first n bytes of files

I've got an extreme problem, and all of the solutions I can imagine are complicated. According to my UNIX/Linux experience there must be an easy way. I want to delete the first 31 bytes of each file ...