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

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0
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2answers
1k views

Ubuntu : unable to copy file to dir created under same credentials

I am Windows 7 remoting to Ubuntu 12.04.2 LTS I am new to Ubuntu ( and *nix in general ) and need to understand how permissions are assigned to newly created dirs. Via Putty ssh session : $bash ...
1
vote
3answers
618 views

Renaming or making filenames unique

I have written a plsql procedure using utl file to create files in the temp directory in Unix. I am sending the names of the files to a shell script to mail these files and delete after mailing from ...
4
votes
3answers
1k views

limiting size of logfile from a variable

How can I limit the size of a log file, which is saved in the form of 'foo.txt', from within a bash script please? I want to put in the variables 'LOGFILE=50 mb' and it uses that size, or whatever ...
1
vote
2answers
59 views

Copying Files in a Folder To Individual Folders

This might sound like something quite odd but for my HTPC, I need to rearrange how my files are stored such that each of the individual files in a folder needs to be moved to a subdirectory of its own ...
3
votes
3answers
1k views

Splitting a large binary file into sections determined by context patterns

I have a large (2GB) file that looks like this: ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ <binary data> ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ <binary data> ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ ...
1
vote
1answer
133 views

securing a file on disk with password protection usig strong ssl cipher and view the file in more secured way

I was trying to decrypt a file to standardout and piped its content to a given command. for example cat comand, wc command etc. However I felt the following command can be simplified, any further ...
0
votes
1answer
49 views

Doesn't umask apply to files?

I have set the umask to 0. So: $umask 0000 I do echo 'test' > test.txt And test.txt is created. If I do: ls -l test.txt I see: $ls -l test.txt -rw-rw-rw- 1 jim None 5 Jun 30 22:50 ...
0
votes
2answers
127 views

Merging multiple lines selectively?

I have a large file in which a header line is followed by a string of characters at multiple times. eg: file1 VHBFBJBDSBVVFJBSV SVJBVHJBVJ SVKJBVJBNVKVJV file2 dfhgdgffdghgg SVKJBVJBNVKVJV I ...
-3
votes
1answer
162 views

Break write permission for non root user?

Can non root user edit files he/she doesn't have access to or create new a file in a directory he/she doesn't own? Is there a way to do that? P.S : I know if root user or file owner gives him write ...
5
votes
2answers
92 views

Making a process read a different file for the same filename

I have an application that reads a file. Let's call it processname and the file ~/.configuration. When processname runs it always reads ~/.configuration and can't be configured differently. There are ...
1
vote
3answers
586 views

rsync only subdirectories and content

I have a directory that contains a number of files and subdirectories. See below: baseDir bad1 bad2 subDir1 file1 subDir2 file1 I would like to rsync the contents of baseDir without ...
1
vote
4answers
337 views

Command substitution grepping ls output causes error

I'm trying to make a tar.tgz file using command substitution There are backups of 17 Aug 2012 -rw-r----- 1 ossec 502 804M Aug 17 2012 BKPMDISINT_i6nir20j.F_bkp -rw-r----- 1 ossec 502 2.7G Aug 17 ...
9
votes
2answers
7k views

how to output text to both screen and file inside a shell script?

Currently I have a shell script which logs messages to a log file like this: log_file="/some/dir/log_file.log" echo "some text" >> $log_file do_some_command echo "more text" >> $log_file ...
0
votes
2answers
195 views

How to recover a SD card? [duplicate]

I accidentally deleted my SD card photos. I purchased a software call wondershare photo recovery and card recovery. I am able to recover back 50% of my photos. But I got some strange issues here. ...
28
votes
4answers
943 views

Append huge files to each other without copying them

There are 5 huge files ( file1, file2, .. file5) about 10G each and extremely low free space left on the disk and I need to concatenate all this files into one. There is no need to keep original ...
3
votes
2answers
199 views

Determining if a file system object is a procfs/sysfs/etc. “virtual file” which doesn't report its length correctly

Some kinds of pseudo-files, like many in the procfs and sysfs virtual file systems, have no file size (stat returns st_size == 0) and do not support SEEK_END in fseek. These file system objects, such ...
3
votes
2answers
112 views

Diverting a file write to process

I have an OSX GUI application which I can't change - it writes new CVS lines to a log file when it completes a job. I'd like to work with these new lines, but they are constantly being added. Is ...
2
votes
2answers
373 views

Permissions on an ext4 filesystem on a removable drive used in different machines

I have a USB flash drive with ext4 file system and its files are owned by my user on my local machine, for example by myuser@myhost with 700 permissions. If I unplug my flash drive and plug it in ...
3
votes
3answers
171 views

Delete files except n files with the “bigger” name?

I want to create a shell script that deletes old release files except last n files. In other words, only mantain last n releases when I deploy a new release. File names have this format: ...
10
votes
1answer
8k views

How to redirect stdout and stderr to a file and display stderr to console?

I know how to redirect to a file, and use tee; on a basic level. So $ alias outanderr='bash -c "echo stdout >&1; echo stderr >&2"' # A fake "application" displaying both output and ...
2
votes
3answers
116 views

determine user-modified files

I plan to reinstall my operating system since I messed up some stuff. Access to files and folders is painfully slow sometimes, even if they contain just a few files. But of course, I don't want to do ...
6
votes
3answers
12k views

Test if there are files matching a pattern in bash

I am trying to write an if statement in bash to test whether there are any files matching a certain pattern. If there is a text file in a directory it should run a given script. My code currently if ...
5
votes
3answers
318 views

How can I get rid of this invisible file?

Background I have a folder named akorg✽. That Unicode character causes headaches for me when software makes incorrect assumptions about the text encoding of my file paths, so I'd like to remove it ...
3
votes
1answer
7k views

NFS permission denied

When I configure NFS and create a file on the client NFS shared dir, I get the following message: permission denied. My configuration: configuration nfs server ...
0
votes
1answer
105 views

What disk is a file / directory stored on? [duplicate]

From the command line (bash) I would like to know what disk a given file is stored in. E.G.: $ [what filesystem is this file in command] /tmp/example/file /dev/sda1
2
votes
3answers
1k views

Replace filename with parent folder name

I have a bunch of files each in their own subdirectory. I need to write a script to rename each file to have the same name as its directory: For example, given: ./1111/1234.pdf ./2222/2345.pdf ...
17
votes
3answers
2k views

How does touch -t work internally?

How does touch -t command works exactly, internally (I tried to find its source code but couldn't)?
4
votes
1answer
8k views

Move files and delete directories with rsync?

Recently I needed to delete a large number of files (over 1 million) and I read that doing: rsync -av --delete `mktemp -d`/ ~/source && rmdir ~/source Was one of the most optimized ways to ...
1
vote
2answers
155 views

How can find support large files?

I would like to find all the files of my system, which sizes are more than a couple gigabits. I thought I would use find -size, but the man page states: The size does not count indirect blocks ...
0
votes
1answer
303 views

Simple bash script taking too long to execute

I wrote the following function in my .bashrc for use instead of rm * : function re() { cp . -R /home/glset/ritwik/trash/ rm * } It works .. but it is very slow. Even for small files it takes too ...
3
votes
2answers
76 views

Test if a file is on NFS?

Is there a simple test to determine if a file is on an NFS mount? (Or maybe more generally, what type of filesystem a file lives on?) I am imagining some ugly prefix matching against fstab...
0
votes
1answer
144 views

Unable to delete a directory even as root

I am unable to delete a directory even as root. The command rm -rf kdyiyv.pif returns nothing. Then I tried the command, touch kdyiyv.pif for which there was an error: touch: setting times of ...
5
votes
2answers
2k views

Disk usage summary per user

Is there a way to get the disk usage per user under a given path? du doesn't seem to have an option to aggregate disk usage per user, and df only seems to report how much disk is left on the drive. ...
2
votes
2answers
258 views

Unable to concatenate files with find ./subdir/* -print0 | sort | xargs -0 cat > merge.txt

I am trying to concatenate thousands of files that result from processing the pieces output by split with find ./subdir/* -print0 | sort | xargs -0 cat > full_merge.txt The files under subdir ...
0
votes
3answers
290 views

What does ./ mean? [duplicate]

I'm having a hard time getting what ./ does. In the Linux Essentials books, it asks me in an exercise to delete a file named -file. After googling, I found that I need to do rm ./-file but I don't ...
4
votes
5answers
1k views

How to split a file by using keyword boundaries

I have a vcf file that contains numerous vcards. When importing the vcf file to outlook it seems to only import the first vcard. Hence I want to split them up. Given that a vcard starts with ...
2
votes
1answer
51 views

Strange changes in files

I have a very strange problem on one of my servers. I'm not sure if it's completely related to linux because it occurs in php and js files. Today I was trying to backup my databases using phpmyadmin. ...
2
votes
2answers
3k views

Linux listing files between two date without touch command

I need a command which will list the files between given date and time (YYYYMMDDHHMMSS - format) in to a text file. I don want to use touch command as its creating permission issue. I am new to this ...
2
votes
4answers
120 views

find command: how to ignore pathname?

I have to find some type of files in a directory and it's subdirectories and I only have to print out the filenames. So here's the main command: find -type f -name "*.c" Now, how could I cut the ...
5
votes
3answers
381 views

Dynamic file content generation: Satisfying a 'file open' by a 'process execution'

I have a read-only file, F. A program, P, that I'm not the author of, needs to read F. I want the content of F to come from another 'generator' program, G, whenever P tries to read F (taking F to ...
0
votes
1answer
44 views

Keyboard shortcut to switch files in one Emacs instance?

I've multiple files opened in an Emacs client. Right now, to toggle between files, I've to click on the file name at the bar below in the editor. Any keyboard shortcuts for switching between files?
20
votes
1answer
605 views

How to move a directory, file by file? (instead of “copy then remove”)

My computer has one 500GB drive. I want to move 400GB of data from /unencrypted to /encrypted. Both directories are on the same partition, but /encrypted is handled by ecryptfs, so mv /uncrypted/* ...
3
votes
5answers
4k views

Find and copy directories containing file type

I have a directory "Movies" containing subdirectories "Movie Name". Each subdirectory "Movie Name" contains a movie file and related image/nfo files etc. I'm trying to copy all directories containing ...
5
votes
1answer
2k views

how to keep file owner same for newly created files

This question is regarding samba file access. I have created a folder A, and under folder A created two folders B and C. And also created three users A, B and C. User A has access to all three ...
4
votes
1answer
209 views

Can I create a symlink that will ignore subdirectories?

I'm trying to get dropbox symlinked to the relevant folders in /home. I'd like to symlink them like this: ~/Dropbox/Pictures --> ~/Pictures ~/Dropbox/Camera Uploads --> ~/Pictures/Camera ...
1
vote
1answer
591 views

Getting back rsync's deleted files [duplicate]

I accidentally rsync-ed to a server using the delete attribute when I shouldn't have. Is there any chance of getting the data on the server that rsync removed.. back?
3
votes
3answers
3k views

How to move all files with a certain file extension from subdirectories to a single directory

I have a directory that contains many subdirectories. The subdirectories contain lots of types of files with different file extensions. I want to move (not copy) all the files of one type into a new ...
0
votes
3answers
685 views

Rm command recovery for this situation

İn my desktop, i have a dir. called exam, and i wanted to remove it from the console and wrote rm * /exam, and apparently it removed some other files from my desktop. Please tell me that there is a ...
1
vote
1answer
130 views

Standard I/O File Descriptors

I am new to Shell SCripting I code this $ ls -l 1> stdout.txt and I get the output as desired, 1> stdout.txt redirects the output from standard output to the file stdout.txt. I don't ...
3
votes
2answers
120 views

Search by file dimension [duplicate]

I have many photos. How to search files by its dimensions? For example, i want to search images with exact dimensions 500 x 500 pixels. Is there any utility for this task?