Logical entities that contain data in a filesystem. Use this tag if your question: is about programs that create files (e.g. gzip, tar, zip); deals with characteristics of files (permissions, size, path/location); or is about management of files (renaming, listing, moving, removing). For operating ...

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1answer
113 views

Assigning ls output to a variable gives unexpected behavior

I was writing a script to clean a text file from a directory (I know,it's a bad idea but I really need it) and I wrote this: #!/bin/bash var=$(ls -p /direcotry/to/file | grep -v /) truncate -s 0 $var ...
2
votes
2answers
409 views

How can I start a file-processing daemon? [closed]

How can I run a script-based tool which will process files continuously downloaded to given directory as they arrive? I'd like to minimize delay (~1 second is OK), script can have own infinite loop. ...
19
votes
5answers
1k views

Find files that a user can write, efficiently with minimal process creation

I am root. I would like to know whether a non-root user has write access to some files - thousands of them. How to do it efficiently while avoiding process creation?
0
votes
1answer
59 views

UMASK not having effect on some file creations

I have umask set to 002 in my Linux server and its working fine while I create file using touch. But I still have some files that are created with permission contrary to umask. These problematic files ...
3
votes
2answers
64 views

Is it possible to have a lag between scp and checking for new file

Got a cronjob that downloads things regularly: if ! su scpuser -c "scp ..." > /dev/null 2>&1 || ! [ -f $scptarget ]; then; error "did not download stuff" $scptarget is where the thing ...
2
votes
2answers
1k views

Why does touch create new files?

I understand that this might be a very strange question to ask, but I couldn't help my curiosity, and I couldn't find this anywhere on the net (And I'm too lazy/incompetent to look up the source ...
4
votes
1answer
160 views

Unexplained files found in home folder

For background information, I'm running openSUSE 13.2 and KDE 5. Today I found a number of unexplained files and folders in my home folder which state they've been edited 3 days ago. I do not ...
0
votes
2answers
842 views

Files greater than 1 GB and older than 6 months

I want to find files which are greater than 1 GB and older than 6 months in entire server. How to write a command for this?
2
votes
1answer
335 views

Seeing all regex matches in a file in Bash

I'm in bash and I have a file, I want to find all matches of a regex in it and have them printed. How do I do that? Followup: Assume I want to print only unique matches, i.e. if a match appears ...
33
votes
4answers
2k views

Does bash open files in O_APPEND when using “>>” on linux?

If we use echo 1234 >> some-file then Documentation says that the output is appended. My guess is that, if some-file does not exist, then O_CREAT will make a new file. If > was used, then ...
12
votes
3answers
3k views

How to copy a directory recursively using hardlinks for each file

I want to create a "copy" of a directory tree where each file is a hardlink to the original file Example: I have a directory structure: dirA/ dirA/file1 dirA/x/ dirA/x/file2 dirA/y/ dirA/y/file3 ...
2
votes
3answers
299 views

Is it possible to create dynamic content on file read operation?

Is it possible to generate file content based on file name? I need a lot of similar .conf files with content depending on file name only. Can I create some "dynamic" file and generate a bunch of ...
4
votes
3answers
933 views

Why can't I read /dev/stdout with a text editor?

I just started learning how Everything Is A FileTM on Linux, which made me wonder what would happen if I literally read from /dev/stdout: $ cat /dev/stdout ^C $ tail /dev/stdout ^C (The ^C is me ...
1
vote
3answers
601 views

How to change the permission and group-owner of a file at the same time

For changing file permission, I know I could use chmod. For changing group-owner, I could use chgrp. However, if I want to change both permission and owner at the same time, any command I could use on ...
8
votes
2answers
566 views

Create a gzip file of a predetermined size

I want to test an upload of files of content type application/x-gzip of various sizes ranging from 100 MB to 999 MB. How can go I about creating .gz files of these predetermined sizes? If I do dd ...
3
votes
4answers
2k views

Find the last occurence of a string in a given filetype in all subdirectories

I have multiple sub-directories each with different depths. I need to search for the last occurrence of a string in a specific file type (say *.out). How can I accomplish this? I have tried: grep -r ...
4
votes
2answers
130 views

Are files defined by their content blocks, inodes, both, or filenames?

Are files defined by their content blocks, inodes, both, or filenames, or something else? Fundamentially, what is the definition of a file? E.g. two hard links can share the same inode and thus ...
2
votes
1answer
54 views

Clustering identical files ignoring spaces & linebreaks

Consider a folder with many XML files (10K small text files). Some XML files are identical, some are different. I would like to find out what files are identical (ignoring whitespaces, tabs and ...
2
votes
2answers
160 views

Efficient search of unique owners of files and directories

I would like to view the unique owners of all the files and directories underneath a certain directory. I have tried: ls -ltR <dir-path> | grep -P '^[d|\-]' | awk '{print $3}' | sort | uniq ...
2
votes
2answers
42 views

Relation between timestamps of files

If I am correct: atime is the last time the file was read/accessed. mtime is the time when the file content last modified. ctime is the time when the inode of the file, was last changed. ...
2
votes
4answers
745 views

Search and Delete duplicate files with different names

I have a large music collection stored on my hard drive; and browsing through it, I found that I have a lot of duplicate files in some album directories. Usually the duplicates exist alongside the ...
4
votes
2answers
3k views

Find files created by a particular user

How would I go about discovering all of the files created by a particular user and display them to the screen? I've started a script that prompts the current user to enter the username of whom they ...
-1
votes
1answer
33 views

Advice with How to Return the # of Files found within a folder [duplicate]

Create a script to ask a user for the name of a folder and have the script return the number of files found within the folder. If folder doesn't exist, display error message to the screen I've gotten ...
0
votes
1answer
2k views

How can I delete files on a read-only file system?

I have an encrypted .dmg file with some useless files that I need to delete to make space. How can I delete them without having to convert them into a read write system and then back? (Would take 4~5 ...
1
vote
2answers
166 views

Read the file from one Unix server to the other Unix server

I have a Pro*C program which I run on Unix server a but the input file required for this program is on other Unix server b. Whenever I run I have to copy the file from server b to a. Is there any way ...
0
votes
2answers
67 views

Precaching the list of files of the filesystem

I was wondering where and in what form a list of files and directories is stored on the ext4 filesystem. The problem is that whenever I try to access a certain directory for the first time since boot ...
-1
votes
2answers
279 views

Extracting certain data within a script output file

We have a script that runs several commands and rolls up all the output and inserts in into a log file. One of the commands it runs is "netstat -anp". I'd like to be able to search this file for all ...
1
vote
2answers
383 views

How would I use sed or awk to extract certain lines in a file

If I wanted to search for all lines in a file that start with a date, such as "May 1", how would I do that with sed or awk? I need to extract this data and either send to screen or a file. Thanks.
0
votes
2answers
278 views

Find command returning wrong data [duplicate]

I am using this command to list all files that have been modified in the last day (or created) find ./ -mtime 1 -ls However it keeps returning files from 30th April when I am running the command ...
3
votes
3answers
2k views

Create many files with random content

I am looking for a command to create multiple (thousands of) files containing at least 1KB of random data. For example, Name size file1.01 2K file2.02 3K file3.03 5K ...
2
votes
2answers
185 views

List files recursively in Linux CLI with path relative to the current directory, max 250 char

I'm trying to list all the files with names no longer than 250 characters (including the directory it is part of, from the relative path my command is inside). I've seen a similar thread , but that ...
0
votes
0answers
38 views

Regex for a non-fixed pattern

I am trying to come up with the right regex (compatible with python) that would match a file that contained sample input as follows: On the third day of Christmas my true love sent to me: three ...
9
votes
2answers
1k views

What are .serverauth.##### files in my home directory?

The files are .serverauth.##### where ##### is a 5-digit number. I have a handful of these files in my home directory with a broad range of creation dates spanning a couple of years. What are these ...
0
votes
1answer
164 views

Incrontab / Incron on Cygwin

Does anyone please know if it is possible to install incron/incrontab within Cygwin? I've had a look and the package does not appear on the cygwin website, I wondered if anyone had tried, knew of any ...
1
vote
2answers
158 views

Why is there a file called [ in my /usr/bin directory? [duplicate]

Recently back to Linux from another operating system I noticed a file called [ which seems strange to me. What is it for? $ ls -l /usr/bin | head -2 -rwxr-xr-x 1 root root 39552 Nov 3 14:44 [ ...
0
votes
1answer
117 views

How to fix ntfs file problem when there is now windows?

I have a "stubborn" file on an NTFS partition which refuses to be deleted. A little background on the problem... Problem happened when I was running Zim on my Linux and the system froze due to some ...
1
vote
1answer
1k views

What is this file: .readahead doing in my root directory?

When I do: ls -a / on Fedora 21 there is a hidden file named: .readahead and it's 104092k What is this file?.... is it suppose to be there? I found this on google: readahead system call on ...
1
vote
2answers
196 views

How do I get a count of file references inside a folder of files with those references?

Alright, I have two folders. For simplicity's sake, I'll call them people and animals. The animals folder has a file for each animal, and the people folder has a file for each person with references ...
2
votes
1answer
1k views

How can I check if rsync made any changes in bash?

I have a script which uses rsync to sync data in a remote -> local scenario. Immediately after the rsync command is run, a check to see if the error code equals zero or not. If its zero, further ...
8
votes
1answer
421 views

What three files are always opened by a process?

Someone mentioned that there are three different files that a process always opens. What does this mean? What files are they?
0
votes
1answer
136 views

command “find … -exec mv …” created a file with strange content

I wanted to move binary files from folder /myhome/sourcedir to /myhome/targetdir. I used a command find /myhome/sourcedir -type f -cmin +3 -exec mv '{}' /myhome/targetdir ';' Folder /myhome/sourcedir ...
2
votes
1answer
136 views

Using wget, how to download to a specific location, without creating folders, and always overwrite original files

How do I use wget to download files to a specific location, without creating directories, and overwrite the original every time. I've tried using the -r -P and nc options in combination but this ...
0
votes
1answer
51 views

Understanding syslog rotation, to implement own syslog rotation

I am trying to implement a simple syslog server (UDP based). On this , we are trying to implment SYSLOG rotation feature. Currently the roatation of logs is done by rename C API. By doing this we ...
0
votes
1answer
208 views

How do I copy all files that have been created or modified in the last 12 months?

I would like to copy all the files created in the last 12 months to a new folder leaving behind everything else. Including sub folders.
0
votes
1answer
1k 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 ...
3
votes
2answers
95 views

List direct symbolic links (links that don't point to another symlink)

I need to make a list of all direct symbolic links in a directory, i.e. symbolic links that point to another file which is not a symbolic link. I tried to do it this way: for i in $(ls -1A); do ...
1
vote
1answer
1k views

ext4 disk space not reclaimed after deleting files

I recently got a "device full" warning for a 2 Tb external ext4 drive. I deleted a bunch of files, about 90-100 Gb of old system backups, and since I did not want to empty all trash, I deleted the ...
1
vote
2answers
234 views

How to check if a group of files is readable?

I have to check if a group of files is readable. I know how I would go about checking one file by using [ -r file.txt ], but how would I go about writing a loop that would check multiple files ...
-3
votes
2answers
119 views

Delete line from files

I have 8 files in a folder. If any of these files has 2 lines I need to remove the second line from that file. If a file has more than 2 lines then then I do not need to do anything to it. Can anyone ...
1
vote
1answer
251 views

Sticky bit and users with sudo permission

Let's say I chmod 1777 a folder /opt/test and all files inside it as user user1. Hence user2 is able to update and edit files inside the /opt/test directory. When user2 operates via sudo, he's able ...