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

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0
votes
1answer
36 views

how to change where a symlink points [duplicate]

Can you tell me what is this in red marker area. ? and if want to change /media/files/tb-prod/files to some other path, then how it will be .. ?
0
votes
1answer
37 views

What dev folder allows you tell the OS to cache something?

Someone told me that there is a sub folder off of dev that basically allows you to tell the OS to keep the contents of that folder cached in RAM. So if I put some files & directories in ...
1
vote
2answers
57 views

How use minimum number of commands to copy all .txt files from all subdirectories to one directory?

I have more than 90 subdirectories and inside each one, there will be a number of .txt files. What I need to do is to copy all those txt files out to one single directory. How can I do that?
2
votes
2answers
55 views

Is reading a file on UNIX faster than writing a file?

Sorry for the sheer simplicity of this question. A rather obtuse performance bottleneck has boiled down to this very small query. I have done some empirical analysis and I think I might be getting ...
3
votes
5answers
180 views

efficient cross-os file size shell function

I'm looking for a simpler way to have a cross-os-unix file size check. I could use wc -c but I'm concerned the performance may suck on large files (I'm assuming it just counts chars and doesn't do a ...
3
votes
1answer
172 views

“tail -f” show old file after file has been rotated [duplicate]

I have a script running continuously, reading tail -f /var/log/daemon.log The problem is, when the file /var/log/daemon.log gets rotated by logrotate, tail still has "file handle" for the old ...
0
votes
1answer
48 views

File not found: Beautiful Soup

I am trying to run a program that I downloaded in Ubuntu latest version, but I continue getting an error everytime I try to run the program. It says: File Not Found: BeautifulSoup So in order to ...
18
votes
5answers
1k views

Is there a way to tell sudo to set my username as owner for the files created instead of root?

If I do a sudo cp /etc/foo.txt ~/foo.txt, the new file is created with root as the owner. Right now, I see no way around this other than using the last two commands (ls to clarify use-case): ...
3
votes
4answers
105 views

How to remove text matching specific patterns from a file

I want to compare two files to check for differences between them, fileA and fileB. fileA is like a template file and fileB is the file which I want to compare to it. Anytime I find a difference I ...
3
votes
1answer
52 views

Recover atime after vim

I've vimed a file, and only afterwards realised that I need the atime (last access time) for the file. Is there any way to recover the atime for a file after accessing it inadvertently? The ...
0
votes
2answers
44 views

execute command from txt file

I have file and in this file i have this lines: ssh root@server1.com ssh root@server2.com etc.... And i have script that i like to go on every server and execute the ls command on each of this ...
4
votes
2answers
109 views

Why does 'find -delete ' delete all files in a directory recursively

So the following behaviour of unix find just cost me dearly: > touch foo > touch bar > ls bar foo > find . -name '*oo' -delete > ls bar > touch baz > ls bar baz > find . ...
1
vote
2answers
34 views

Remove all files without a keyword in the filename

I have a list of files in the following fashion: > file1.jpg > file1_orig.jpg > file2.jpg > file2_orig.jpg I want to keep all the files with the extension _orig.jpg and discard those ...
2
votes
3answers
56 views

What is the system-level effect of file permissions? [closed]

I know that r means read permission, w means write permission, and x means execute permission in the output of ls -l, like -rwxr-xr-x. But My question is what is behavior difference on operation ...
5
votes
1answer
1k views

How can two files in one of my folders have the same name?

I downloaded two files, they were both saved to the same filename and then I transferred them with scp to another computer. Why didn't they become one when the second was saved?
2
votes
1answer
32 views

How do I search files without certain extensions in their names?

I would like to search recursively in all the files and directories under a directory for some strings e.g. library. I also would like to exclude files and directories which store downloaded ...
3
votes
1answer
40 views

Methods to find out which (configuration) files are read by executable when started

What are the clever ways to find out which (configuration) files are read by executable if started? For example snmpd or sshd. One option is probably to check the CONFIGURATION FILES or FILES section ...
1
vote
3answers
124 views

Joining files on disk

Say I have several file with the following naming: 000001 000002 000003 ... Each of these files is a csv file (may include escape characters). In total the folder has ~20GB of data. How can I ...
0
votes
5answers
357 views

Move files to multiple folders [closed]

I've searched for this function, and there are lots of answers, but I haven't been able to find anything that works for me. I have a folder with about 30,000 files, and I want a terminal command or ...
-1
votes
3answers
41 views

Split a file into multiple based on selected lines [duplicate]

I have a file in which more than 50,000 lines are there. How can I split the file into two or more based on the selected lines? Suppose I want to split a file from line 10,000 to line 40,000.
0
votes
1answer
253 views

Accessing file from the Windows host in a VirtualBox virtual machine

I am running Ubuntu 14.04 as the guest operating system in a VirtualBox virtual machine. The host runs Windows 8 (24GB). I want to access a folder of the host inside the guest. Since the source is ...
3
votes
2answers
178 views

Deleted /tmp accidently

Accidently, I ran sudo rm -r /tmp, is that a problem ? I recreated it using sudo mkdir /tmp, does that fix the problem ? After I recreated the directory, In the places section in the sidebar in ...
2
votes
4answers
162 views

print capital words in first column of file

I want my output : VDD. GND AGNDSUB VMEASPOS. VMEASNEG VREFEXT File1 having following information : Power and signal VDD Digital Power This pin provides power supply connection for the digital ...
3
votes
2answers
81 views

Cannot delete File on Fedora

I have a file with following permission: -rwSr-s---. 1 1634630331 1818884080 118784 Jun 29 1970 DailyUpdateClass.class If I try to delete this file with root login, I get error. rm: cannot remove ...
1
vote
3answers
108 views

merging all files into one file?

I was trying to merge all the text files in to one file. All the text files has one column and equal number of rows. My data file names are data_1.txt, data_2.txt, data_3.txt, . . . data_n.txt. ...
1
vote
3answers
102 views

Unable to delete files as a root user using RS232 serial cross cable

I have a device(CCTV decoder) which was rebooting itself, so cant login using LAN cable. It has RS232 port only, no VGA and keybord/USB port(Embeded PC). I connected RS232 cross cable and used ...
4
votes
2answers
182 views

Convert file with integers written in ascii to binary file of integers

I have a file that contains a long list of integers written in ascii separated with newlines, like such: -175 2 -19345 345592 -45 2355 etc... I want to convert this file into a "binary" file ...
28
votes
6answers
2k views

How does Linux choose which application to open a file?

If a file tells the OS its file format, how does the OS choose which application to open it by default? In Windows, is the association stored in the registry table? How does Linux choose which ...
1
vote
1answer
73 views

Replace a string in a file and overwrite the file

I wrote my script using the the directory ~/deleted (it's a long script). after using ~/deleted for the whole script. I want to let the user choose the directory by putting the path in ~/.rm.cfg. My ...
0
votes
0answers
35 views

What are some preferred methods to efficiently edit files on a remote Unix server?

I'm looking for a more efficient GUI-based solution to edit root-owned and root-only writable files than using either nano or vim, both of which of course limit your cursor to navigate one character ...
1
vote
1answer
96 views

Compare file size of multiple files in an array [closed]

Scenario: Ftp site has 100s of files. Once a day, all the .gz files are copied to an AWS site then renamed. Only the date is kept in the file name. Some of the files corrupted during copy. A txt ...
0
votes
1answer
84 views

Delete ghost files with special characters

I have read several ways to delete files with special characters, but none of them works for me in one special folder in my cache system. I have no idea how the files got there, and why they turned ...
1
vote
2answers
65 views

Remove unneeded file lock in script

I have some script using flock executable. It works well. Problem is when this script calls another script, and it creates background process. In this situation background process inherits file locked ...
3
votes
2answers
120 views

Why does find -exec du sum up differently?

I have family pictures and movies in a folder /media/data/Selbstgemacht and I'd like to find the size of all pictures. In /media/data I use find Selbstgemacht -type f -iname '*.jpg' -exec du -ch '{}' ...
6
votes
4answers
727 views

Delete spaces, hyphens, and underscores in filenames?

What is a good command to delete spaces, hyphens, and underscores from all files in a directory, or selected files? I use the following command with Thunar Custom Actions to slugify filenames: for ...
4
votes
2answers
97 views

Write variable containing large text with \n to a file with common shell interpreters. How do you do it?

Environment: linux shell or better, ash shell in busybox (example system: Openwrt). Given a string variable with large text "${a}" constructed in this way: for index in $(seq 1 40000); do #it is ...
4
votes
2answers
186 views

Joining two files

I have a 2 files with the following: File1.txt A 1 B 2 C 5 Z 3 File2.txt A 4 B 7 C 10 D 11 What I would like to do is create something like A 1 4 B 2 7 C 5 10 D - 11 Z 3 - Is there a ...
1
vote
1answer
40 views

Measuring transfer speed of USB drive

I want to write a program to find out the average data transfer speed of my USB port. How do I go about implementing it? The only method I can think of is writing a large file to the path where the ...
1
vote
1answer
48 views

/proc/config.gz is of 0 bytes

I have an Android TV stck I compiled Linux for IT from https://github.com/Galland/rk3x_kernel_3.0.36 But when I booted that Image I found /proc/config.gz is of 0 bytes can some please explain how ...
3
votes
2answers
146 views

Script using “split” in a loop over large files

I'm attempting to get a bash script working, and running into terrible errors along the way. The aim of the script is to break several large text files, into multiple files with a line count read from ...
1
vote
0answers
26 views

How can I unveal files on my external hard drive?

I copied a big folder (around 110 GB) from my (Mac 10.7.5) computer onto a hard drive (exFAT). It took quite some time and afterwards I even checked that the files were actually there. After more ...
0
votes
1answer
57 views

How do I search for files from the gnome GUI in debian?

I sometimes spend time in the standard classic gnome GUI in debian wheezy, and today I wanted to search for files containing some text in a certain folder. I tried to do it the windows way by going ...
9
votes
3answers
674 views

Why are some files and folders hidden?

I can understand the rationale of hiding files and folders in the /home/user directory to prevent users from messing around with things. However, I do not see how the same rationale can be applied to ...
0
votes
1answer
64 views

How do I delete a file in a read-only directory?

I've got a directory and a file in it, with the directory marked as read-only: $ mkdir directoryname $ touch directoryname/filename $ chmod a-w directoryname I cannot delete the file, even if pass ...
3
votes
4answers
141 views

The most *robust* remote file copy?

How would I go about to copy files over a very unstable internet connection? Sometimes, the connection is lost, other times the IP of one machine or the other machine is changed, sometimes both, ...
1
vote
4answers
75 views

Delete all but largest file in multiple directories

I have multiple subdirectories in /home/usr/ProjZ/programs/ that each contain multiple (or one) .js files. What I need to do is delete all but the largest .js file, if the subdirectory contains ...
2
votes
2answers
47 views

Select a range of files after sorting them

One thing I notice slower for me if I switch from using a GUI file manager to CLI is: In a GUI file manager, I can quickly select a subset of files under a dir by, first sorting them according to ...
3
votes
2answers
60 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 ...
2
votes
4answers
90 views

Command line 'buffer' [duplicate]

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 ...
2
votes
1answer
77 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: ...