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

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5
votes
0answers
57 views

Why does OS X `install` errors on redirected input when the same version of `install` on linux works fine?

I would like to use install command in order to create a new executable file with pre-populated content (e.g. with single pwd command in it). So I've extended this example which creates a new empty ...
1
vote
3answers
38 views

How to join two files by matching a column with an irregular number of columns?

file1: 0000002|SLM DEV CORP |PO 857 0000003|S TOPPING |APT 19 0000004|JD BROS LTD ...
0
votes
0answers
35 views

Files mysteriously disappearing

Today, I opened my music player to play a particular song, and couldn't find it. So I check the filesystem - the entire folder for that album is missing. I did a count of the entire contents of the ...
0
votes
1answer
719 views

What is the file type “raw G3 data, byte-padded”

I ran $ find ~/ |xargs file|grep -i -e SQLite just to understand what programs use sqlite. I started seeing lines like /home/alord/hg/cpython/.hg/store/data/_modules/__sqlite/cursor.c.i: raw G3 ...
1
vote
1answer
34 views

Allow file to be read by only system command in a C Program

I have a C program program.c that contains a system("/bin/cat file.txt") command, where file.txt is a file in the same directory as the C program. Now I would like to prevent users to read file.txt by ...
0
votes
2answers
31 views

How to count how many files belong to each user/group combination?

How to count how many files belong to each user/group combination? I need to do this for each user/group combination that exists, in each of the directory trees /etc, /usr, and /var.
1
vote
1answer
13 views

File for assigned inet addresses

I am using Lubuntu 14.04 with kernel 3.19 and can't find file where are inet addresses stored (etc. 192.168.1.11). Man page for ifconfig state files: /proc/net/socket #can't find at all /proc/net/dev ...
0
votes
2answers
43 views

How to merge files with same names

I want to know how to merge files with same names For example I have following files in one folder: 1081713FHN-NA.one_.txt 1081713FHN-NA.second_.txt 1081713UEN-NA.one_.txt 1081713UEN-NA.second_.txt ...
-2
votes
1answer
34 views

What does the -p option do exactly with the cp command?

So I am trying to understand what is the significance of the -p option for the cp command. I opened the manual of the cp command and it says -p same as --preserve=mode,ownership,time stamps. But ...
3
votes
1answer
28 views

Head Script output explanation

So this shell script: #!/bin/bash head >/dev/null; head; almost always gives the same output when called with sequential numbers (e.g. seq 10000 | ./sscript) OUPUT: //blank line 1861 1862 ...
13
votes
2answers
46k views

Changing a file's “Date Created” and “Last Modified” attributes to another file's

I'm using merge cap to create a merge pcap file from 15 files. For the merged file, I have changed the name to that of the first of the 15 files. But I would also like to change the merged file's ...
15
votes
3answers
29k views

How do I use wget with a list of URLs and their corresponding output files?

Suppose list_of_urls looks like this: http://www.url1.com/some.txt http://www.url2.com/video.mp4 I know how to use that with: wget -i list_of_urls But, what if my list_of_urls has this, and they ...
0
votes
4answers
43 views

grep all the lines in a file and write line to a file from the pattern matching point

For example, a temp.txt file contains information like below: adsf on line jhkjhvjdbvjvbvbdjkvn qerwtt on line fdgdgdgdd qwqertg on line safffasffaf wrt on line adaddsd I want to grep for ...
3
votes
2answers
197 views

How to write contents of a file to new file removing repeated lines [duplicate]

For example, a file file1.txt contains Hi how are you hello today is monday hello I am fine Hi how are you After the processing of file1.txt it should write to file2.txt and contents ...
1
vote
1answer
17 views

What does when the file's status was last changed mean?

I'm reading about find and for one of the tests (-cnewer file) it reads: File's status was last changed more recently than file was modified. What is the file's status? It's obviously a date, ...
1
vote
2answers
169 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 ...
0
votes
2answers
49 views

How to concatenate files using initial part of filename

I have many files with names in the form username_pattern_suffix.ext where "pattern" is fixed, but there are very many usernames, each with several files (i.e. values of 'suffix'). I'd like ...
0
votes
1answer
28 views

How to move (image) files to other directories based on files' dates

I have a directory (currdir) with 24000 images on a centos/cpanel server. I want to split this directory by moving images from this directory into other directories (or sub-directories inside currdir) ...
0
votes
2answers
49 views

How can I filter out current directory ('.') in bash?

I'm currently trying to write a little script to convert all the flac files to mp3 files. However, I ran into a bit of a problem when trying to set up recursion down into all my music folders - the ...
8
votes
7answers
6k views

How to remove only the content of directories?

I'm in a folder: /var/myfolder. Inside there are some other folders like: /var/myfolder/A/ /var/myfolder/B/ `/var/myfolder/C/ etc. Inside each there are some files with random names. How do I ...
10
votes
1answer
227 views

How to sort a file based on a section of a field

I would like to sort a file : D104HN-D104HA 8.320 4.521 1.69e+05 -- D104HN-D104HB* 8.320 2.823 2.93e+05 -- A90HB#-A90HA 1.655 4.207 7.12e+05 -- ...
0
votes
4answers
44 views

Transferring executable files from Windows to Linux via WinSCP

Why file lose execute permission on Windows when it is transferred from Linux to Windows and vice versa?
1
vote
2answers
3k views

Find and move directories based on file type and date

I have a directory "New Movies" containing 200+ subdirectories "Movie Name (year)". The subdirectories "Movie Name (year)" contains a single video file (avi/mkv) and several related jpg/xml files. I ...
0
votes
1answer
3k views

Setfattr always returns operation not supported

I'm trying to get a script working however I'm having issues with a particular line trying to set file attributes with setfattr. The line in question is ret=os.system('setfattr -n "user.dummy" -v ...
1
vote
2answers
761 views

How to give sftp access to sub-directory only not to parent

I want to give SFTP access to user tom for directory /var/www/html/my_project/. while I don't want to give any SFTP access to directory /var/www/html/. currently /var/www/html/my_project/ and ...
1
vote
1answer
25 views

Ways to consolidate music folder

Having used iTunes for a long time, my iPod Classic finally started showing signs of dying. I bought a FiiO X5II and put all my music onto it's microSD XC card(s) using rsync to ensure the same folder ...
0
votes
3answers
132 views

What is the difference between a directory name that ends with a slash and one that does not? [duplicate]

Is there any difference between a directory name such as mydirectory and mydirectory/ I noticed this happens when I execute ls in some directories - some of the directory names have a slash and ...
2
votes
2answers
59 views

How to copy image files whose names don't end with their resolution size?

I have a folder with images in it and it is organized by year and month folders (ie. /2015/08/image.jpg). Whenever an image is added, it is also copied and resized like so: image-1024x768.jpg ...
3
votes
4answers
7k views

Move huge number of files into date structured directory order

I have about 1 million files in this directory: /home/username/images/ Each of the files are called something like: 012345678910(Place)_0_20120414185957_28841.jpg with the timestamp part of the ...
3
votes
4answers
108 views

Why does mknod require root privileges?

I noticed that the mknod command required root privileges when a creating a node other than a regular file, FIFO or a Unix socket. Why is that? How can a regular user harm a system or compromise ...
184
votes
5answers
377k views

How can I replace a string in a file(s)?

Replacing strings in files based on certain search criteria is a very common task. How can I replace string foo with bar in all files in the current directory? do the same recursively for sub ...
0
votes
2answers
25 views

search the most latest's file name

I am writing a bash script to look for a file which's file name is most recently and file name like: ... Wed_Dec_30_16:47:41_PHT_2015.zip Wed_Dec_30_16:00:41_PHT_2015.zip ...
1
vote
2answers
32 views

Extract a particular substring from filename

I am quite novice in bash scripting. The task I need to solve is extract a particular substring from each filename in a directory. Example file names: Bob Marley - I Shot The Sheriff-2XiYUYcpsT4.mp3 ...
2
votes
2answers
223 views

What are the use cases for write-only and write-execute files? [duplicate]

I understand use cases for r-- and r-x permissions, but not for the -w- and -wx ones.
1
vote
1answer
47 views

ls -lu does not give last access time

The manpage of ls says: -u with -lt: sort by, and show, access time; with -l: show access time and sort by name; otherwise: sort by access time but that doesn't seem to work: ...
0
votes
1answer
25 views

Sort words from n rows

i need to print all the unique words and their occurences from first n rows in a give file. I have to sorted by their number of occurences and then alphabetically.(the only separator is " ") ex: for ...
0
votes
0answers
32 views

mount directory cannot be seen from within apps

I have successfully mounted a local network location on my Android device to /sdcard/routersd with permission set drwxrwxrwx; I can successfully browse within this mounted directory and do copy/delete ...
0
votes
2answers
42 views

Sort words in file

i've got some problems i'm not capable to overcome. I need to count the first let's say N words in a txt file. Then , i have to print them in decresing order, followed by the number of occurences.The ...
2
votes
4answers
95 views

Moving and renaming hundreds of .jpg files, all named 5003.jpg

So here's the deal, my girlfriend wants me to transfer all of her photos off from her iPhone onto her laptop (on which we are running Ubuntu 14.04). All of the dedicated programs I tried to do this ...
0
votes
2answers
30 views

Insert path in file

I have the a file.dat and would like to insert the path of this file as first line. Can anyone help me with this please ? Thanks in advance
3
votes
0answers
47 views

Reason for security software to not scan directories with more than 10,000 resources in them?

We have a security software on Linux which scans for exploits in files that exist in directories on the server (such as if websites had hack scripts uploaded to them). It defaults to a limit of ...
0
votes
0answers
22 views

Incorrect file creation/modification time

So I run a backup script on a home server running Fedora 23. I also run a prune script that removes files older than 30 days. This fresh backup file keeps getting deleted because it's creation or ...
2
votes
2answers
955 views

How can I encrypt a file?

I would like to download some files from my server into my laptop, and the thing is that I want this communication to be as stealth and secure as it can be. So, far I came up using VPN, in that way I ...
51
votes
5answers
28k views

Find duplicate files

Is it possible to find duplicate files on my disk which are bit to bit identical but have different file-names?
29
votes
5answers
44k views

How can I increase the number of inodes in an ext4 filesystem?

I had a problem (new to me) last week. I have a ext4 (Fedora 15) filesystem. The application that runs on the server suddenly stopped. I couldn't find the problem at first look. df showed 50% ...
16
votes
2answers
21k views

Fastest way to concatenate files

I've got 10k+ files totaling over 20GB that I need to concatenate into one file. Is there a faster way than cat input_file* >> out ? The preferred way would be a bash command, Python is ...
4
votes
2answers
347 views

Is there an inode for a directory?

Each file has an inode. Is there an inode for every directory ? If not, how does Linux manage directories.
1
vote
1answer
26 views

How to convert file from one format to another with file attributes?

I have an audio file named with attributes: BreakingNews.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000 Hz I wanted to convert it to in below format: BreakingNews.wav: ...
14
votes
4answers
3k views

Read the middle of a large file

I have a 1 TB file. I would like to read from byte 12345678901 to byte 19876543212 and put that on standard output on a machine with 100 MB RAM. I can easily write a perl script that does this. ...
2
votes
2answers
69 views

How do I rename files using the directory name?

My file structure now is: Input 1 pre.nii 2 pre.nii I would like it to be: Input 1_pre.nii 2_pre.nii From the Input folder, I tried: for i in */pre.nii; do echo $i_pre.nii; done ...