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

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1
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1answer
57 views

How to Test if a file has characters in it?

So i have a part of this code and U want it to output "No such player" if only the names file is empty, i've tried using the test -s command but it gives an output of 0 even if the file is empty or ...
1
vote
1answer
191 views

How to install a .bin file that gives the error that it needs more space in /tmp?

Here is the error: ~]$ ./jdev_suite_121200_linux64.bin 0%....................................................................................................100% Not enough disk space in dir ...
3
votes
1answer
895 views

How unique are checksums?

I have a lot of files I need sorting; and sadly there are many files with the same name but different content, and there are the same content with different filenames. I'm thinking about using md5sum ...
0
votes
1answer
51 views

Why does “file foo.css” and “file bar.css” have different outputs?

For example, executing file styles.css outputs: styles.css: asssembler source text whereas file bar.css outputs: bar.css: ASCII text Even better, is there a way to convert my file styles.css to ...
1
vote
1answer
147 views

linux command stuck

I have strange problem on my Linux machine When I do the following simple command chmod +x /tmp/file chmod is stuck and not returned the prompt what could be the problem? the same issue when ...
1
vote
1answer
62 views

With mv, possible to put a time dependence on files mv'ed?

Let's say there's a specific time and date I have in mind. All files last edited before this date I want to keep in the directory but all files that have been edited since this date I want to mv ...
3
votes
1answer
100 views

Two users with different permissions on same directory

Is it possible to give two users different permissions on the same directory? I want to use it for ftp: userFull gets R+W and userLim gets only Read, depending on who logs on. Im getting stuck on the ...
2
votes
1answer
248 views

Unreadable backup directory on a USB drive

The title pretty much sums it up. I was editing a script I wrote some time ago to automatically backup the contents of my Raspberry Pi SD card, and in the course of editing, I missed a "/", and so ...
2
votes
1answer
92 views

Is there a command which creates a temporary file containing the arguments passed to it?

I can paste the contents of a file into a command using cat and backticks: ls `cat filenames` Is there a way to do the reverse - to turn a string into a (temporary) filename? gcc -o cpuburn `uncat ...
3
votes
2answers
3k views

find the single largest file

We host a share of size 4 TB. How efficient is it to find a file with highest size. Usually we use: du -ak | sort -k1 -bn | tail -1 and it is not easy to scan through a share of such huge size and ...
8
votes
6answers
1k views

How can I get a specific line from a file? [duplicate]

I want to extract an exact line from a very big file. For example, line 8000 would be gotten like this: command -line 8000 > output_line_8000.txt
4
votes
2answers
183 views

Is it possible to prevent files created being world-readable?

Assume a user uid=1000 and guids=1000,33,277 is allowed to create a file in the folder /files/. Is there any way I can prevent that the this user allows others to read the file (which are not at least ...
1
vote
2answers
170 views

Create file with specific formatting from directory contents

I am using Solaris and csh. In $home/test there are five files: a.txt, b.txt, c.txt, d.txt and e.txt. If I run % find $home/test/ -type f -print > ../filenames.txt that file will look like: ...
1
vote
7answers
2k views

Can grep be used for searching files with some string in their names?

I understand that grep can only be used for searching for files which contain a string in their content. Can it be used for searching for files with a string in their names? I read the manpage, and ...
2
votes
1answer
287 views

mapping a split file to /dev/loop0

I have a iscsi disk 2TB large. I make backup of that disk every week. The backup script copies the image of the whole iscsi disk into a file on my NFS. Unfortunately, it does not copy the image in one ...
2
votes
2answers
183 views

setting default permissions with setfacl

I am trying to set default permissions on my directory structure using acl. I would like to have following default permissions for directories and for files respectively: drwx--x--- -rw-r----- but ...
0
votes
1answer
299 views

Move Data from Partition to Partition on Same Drive

Moving data from one drive to another is slow. Copying data on a drive to it's self is slow. Moving data from one drive to it's self is fast. If I'm moving data on the SAME drive but a different ...
1
vote
2answers
471 views

Find when the file was closed in Unix

I know ls -l will give the modified time of file, but it is giving the time when the file was opened, not closed (using Ctrl+D or something) Please tell me how to find the time of file closed ...
1
vote
0answers
122 views

How do I make get-iplayer produce watchable quality without huge filesize?

Summary findings: I'm using get-iplayer v2.82. The files I produce on hard drive are all mp4. I've discovered the following (downloading same TV program in both cases): Using --modes=flashstd and ...
2
votes
1answer
368 views

allow user access via ssh to /var/www/

Context: I am creating a gitolite3 hook for a specific repo, which contains some logic and css foo of my website. so what essentailly happens is Content under /var/www/nginx/ looks like: ...
3
votes
1answer
1k views

Help with giving group permissions to other user's files

I'm a linux beginner using Debian 7 and have created a new user (a website) with an htdocs directory like this: $ sudo adduser website $ sudo mkdir -p /home/website/htdocs $ sudo chown -R website ...
3
votes
1answer
1k views

Can one directory be owned by two groups?

Can one directory be owned by two groups (RHEL 6.2)? I have created one directory: mkdir /opt/shared, then I created two groups: groupadd sales groupadd marketing I added manually to each of ...
3
votes
1answer
241 views

Does du or df perform caching?

I was wondering if there is any caching done with these utilities. I assume not, but not positive. Are there any typical similar utilities that do use caching to speed up results on subsequent runs? ...
1
vote
2answers
57 views

Store a file for all users within a group

If user A is member of group foo, is it then possible for A to share a file for all members within foo without root permissions? chown foo:foo file Is not permitted without privileges. A can say ...
5
votes
6answers
656 views

About the .file and ./directory confusion

This is a dumb question, but I recently moved from windows to linux, and I see one strange thing: ./configure or nano /something/something2 Is this something2 a file? It looks like a directory, ...
5
votes
2answers
2k views

Copying one file to multiple directories

I have a file that I want to copy to another 60 directories. The best way I can think of doing this is by making a bash script that has instructions to every folder like this: cp script.sh ...
2
votes
1answer
177 views

Move extension-less files with mv

I have a folder with images(png, bmp, jpg) and extension-less files. I cant figure out how to move only the extension-less files. They are all random numbered files.
1
vote
1answer
654 views

grep file from file

What is the fastest way to grep -v a file against another one, both line by line. does grep support this ? Or should I use it on two for loops ?
0
votes
0answers
221 views

Editing metadata with bash

I have a bunch of photos(jpeg, bmp, png) that I have arranged in such a manner that the metadata is in html form in a separate file. I would like create some script to read this html file and edit ...
6
votes
4answers
1k views

Delete all files in a directory whose name do not match a line in a file list

I have a directory with 1000+ files. In a text file, I have about 50 filenames, one per line. I'd like to delete all the files in the directory whose filenames don't correspond with an entry on the ...
2
votes
2answers
2k views

Unable to remove the files from an usb drive (neither by dd /dev/zero nor by rm -r)

I have a flash usb drive and up till now it has worked well. Recently I recorded iso to it using dd. Now I want to delete it. $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT ....... sdb ...
3
votes
3answers
142 views

stout can not append to large files

I have Ubuntu 13.10. I have a keylogger to help me remember what I did. Running keylogger prints output to the terminal when I run it like this: keylogger I added it to startup like this: ...
5
votes
3answers
759 views

tail -f, Determine if a file is no longer being written to [closed]

I am using tail -f to follow the growth of a log file. I am having trouble finding a way to detect if the process that is writing to the log file (when it crashes or is otherwise terminated) is no ...
1
vote
1answer
130 views

temporarily disabling one's own filesystem write permission

I can't believe there is no simple solution to this (because it seems potentially a very useful feature to me), but so far I couldn't find any. I'd like to be able to (temporarily) turn off my own ...
5
votes
2answers
153 views

Why does a grep reboot the machine?

On a RHEL 6.5 Desktop, if I use: sudo grep -r foo /* my desktop reboots. Q: Why?? How to debug this? It's the third time my Desktop reboots because of this :D
-1
votes
2answers
490 views

Split files and rename the files

I need to split a large file into 5 pieces and rename them. For Example, file Test needs to be split into Test1, Test2 & Test3. However, the split command splits as xaa,xab,xbc.
-1
votes
2answers
840 views

FTP clients only showing 9998 folders in a directory with many more

How can I increase the limit of files or folder in linux? Right now when I use any ftp software it shows that there are only 9998 folder in that directory. But I ran a simple php script that would ...
5
votes
1answer
4k views

How do I `avconv` every m4a in a dir to mp3s?

So I'm trying to convert lots of m4as to mp3s, and I think the best way to do that is using avconv. The problem is, I can't seem to find any solid examples on how to use avconv. Looking at the man ...
1
vote
1answer
211 views

Difference between cat * and cat * >>

To merge multiple files in a dir I have tried: cat * myfile.log but this seems to just merge line and line and is thus very slow So using instead: cat * >> bigfile merges the files much ...
3
votes
1answer
139 views

How does the system know when a file has been modified? In particular memory mapped files

If I am looking at a process from outside the process how can I tell which files it modifies? One thing I can do is track calls to write, but a process can map a file to memory and write to the ...
4
votes
2answers
2k views

modify file ownership for files inside tar archive

I am working as user, and I would like to create a tar archive, which when unpacked (by root) will extract its files with root ownership (otherwise root would have to change the ownership manually for ...
5
votes
2answers
449 views

Remove Linux directories containing ONLY old files

We have numerous directories that each contain 2 files, one of which is a hidden file. We want to remove all those directories and their contents that contain ONLY files that have a modification date ...
2
votes
3answers
2k views

Compare two files for matching lines and store positive results [duplicate]

I have two files. File 1: A0001 C001 B0003 C896 A0024 C234 . B1542 C231 . upto 28412 such lines File 2: A0001 A0024 B1542 . . and 12000 such lines. I want to compare File 2 against File 1 ...
2
votes
1answer
721 views

Why do deleted files continually reappear?

I've been having a strange issue recently, where I would delete files from a location (i.e. Desktop), and then empty the Trash. However, a day or so later (I'm not sure exactly what triggers it), the ...
2
votes
1answer
225 views

Display file using Dialog

I have a file on disk which contains some text I want to display on the screen. You can do it like this: dialog --yesno "`cat FILE`" 10 100 However, I'm concerned that if FILE becomes large, I'm ...
14
votes
3answers
2k views

Move files and change ownership at the sametime

On Linux (Debian, Ubuntu Mint...), Is there any option command or something that I can use to transfer files to another user without having to do : sudo mv /home/poney/folderfulloffiles ...
19
votes
4answers
2k views

Is there an “open with” command for the command line?

Does the command line have a way to get a recommended list of programs used to open a particular file, based on the file type? For example, a .pdf file would have an open with... recommendation using ...
4
votes
1answer
156 views

Sharing a local directory between local users with full permissions

How do you share a directory /home/shared between two users "eris" and "discordia" such that both can access the directory in their respective home directory, e.g. /home/eris/shared and ...
4
votes
2answers
644 views

Opening a file with program in background from shell

The command to launch a program, say evince, from bash shell in background is evince & But what if I want to open some file with evince in background? Nor evince myfile.pdf & neither evince ...
16
votes
3answers
4k views

Why isn't there any shell command to create files?

Attention please: I am not asking how to make a file from the command line! I have been using touch for making files for years without paying attention that its main purpose is something else. If ...