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

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4
votes
1answer
35 views

Why can't another user access my file when it's a full path?

I have a program that runs a command that is something like this: /home/myuser/bin>> /usr/bin/sudo -u otheruser script.py /home/otheruser/file.txt This works, but now I need this to work when ...
2
votes
2answers
57 views

is it possible to search for files that have a special Linux file attribute?

is it possible to search file in the linux OS that have particular file attribute as this: ---S--l--- ---S--l--- 1 root root 0 Mar 1004:25/opt/csTuner/iba/wys/tuer_lolk What is S in ...
2
votes
2answers
45 views

One-liner to sort and uniq two outputs

I'm currently doing this to sort and uniq the output of two different commands: tshark -r sample.pcap -T fields -e eth.src -e ip.src > hello tshark -r sample.pcap -T fields -e eth.dst -e ip.dst ...
3
votes
1answer
195 views

How do you deliberately trigger a “text file busy” error?

Very occasionally I encounter "text file busy" error while using my Linux 4.0.4 computer. I read that when the error happens, kernel is preventing modification to a file that is being "used". So I ...
0
votes
0answers
58 views

Archlinux: Gnome 3.16 - ls & nautilus incorrect sorting

Recently switched from Xfce 4.12 DE to Gnome 3.16 and I have a problem with dirs & files sorting in terminal and nautilus. Test directories (how it should be): [ Pqr ] Abc Klm My current order ...
1
vote
1answer
344 views

Permission denied writing to mysql log

I am just testing out a new Ubuntu (Vivid 15.04) install on Vagrant, and getting problems with mysql and logging to a custom location. In /var/log/syslog I get /usr/bin/mysqld_safe: cannot create ...
0
votes
1answer
58 views

How to create a bash script that sees all files in a directory and tells me their size and date of creation?

I'm a beginner in the field of programing/coding. I'm trying to write a simple bash script that will see all files in a directory, and then tell me each file's size and each of their dates of ...
1
vote
1answer
122 views

get original creation date of html file

Can I find the creation/last modified date of an html file? For example, I would like to know when some index.html file from some website was created, not when I downloaded it.
3
votes
0answers
24 views

Is posix_fadvice / POSIX_FADV_DONTNEED functional in Linux?

If I am doing once only scanning across big files then do I need to worry about impact on the page cache or does the OS take care to avoid my scan causing pointless churn in the page cache. I want to ...
3
votes
3answers
37 views

Create 2 similar-name files with content from 2-line output of a command

I perform cmd and it outputs 2 lines of text: $ cmd foo bar I need to write these to: `/long/path/x.{load,conf} Writing to this destination requires superuser privilege, which rules out manually ...
1
vote
1answer
85 views

How to see if a file has CAP_NET_ADMIN?

I ran the following command: sudo setcap cap_net_raw,cap_net_admin,cap_net_bind_service+eip `which nmap` Now I'd like to add to my ~/.zshrc a line that detects such settings and exports ...
1
vote
1answer
33 views

What do you call the supervisord and php-fpm et. al. config format?

Both php-fpm and supervisord use a config format that looks like this: [category] settings = value some_other_setting = value Is there a name for this format?
2
votes
3answers
54 views

Move file and preserve owner and mode in one atomic operation

Is there a way to move a file and preserve original owner(group) and file mode in one atomic operation? So there will not be change for others to access moved file in time when is not already set ...
4
votes
3answers
105 views

Find largest files from each date in a directory

I have a directory similar to the following: -rw-r--r-- 1 root root 223K Apr 28 14:25 2015.04.28_14.25 -rw-r--r-- 1 root root 253K Apr 28 14:55 2015.04.28_14.55 -rw-r--r-- 1 root root 276K Apr 28 ...
2
votes
1answer
66 views

How to monitor the opening and closing of files?

I'm writing an AI personal assistant. One part of the software is a monitor daemon. A small process that monitor's user's active windows. I'm using python( with libwnck and psutils for obtaining info ...
46
votes
7answers
4k views

How are file types known if not from file suffix?

I would like to know how file types are known if filenames don't have suffixes. For example, a file named myfile could be binary or text to start with, how does the system know if the file is binary ...
1
vote
2answers
301 views

How to see if the directory exists?

How can I check if /bin/x86_64/bin/ls is a directory in a bash shell script Here is what I tried: #!/bin/bash if [ $# -eq 2 ]; then if [[ "$1" = /* ]] then cd ./bin/x86_64/bin/ls ...
0
votes
1answer
105 views

Remove files newer than X day and hour

I want to remove files, more specifically, symbolic links of /usr/include that are newer than 2 JUN 22:27 How can I do this?
3
votes
1answer
62 views

Deleting ghost files with non-ASCII characters

I have some weird files and folders in my trash on Mac OS X. After I "empty" the trash, the files still remain. I attempted to manually delete the files: $ cd ...
1
vote
3answers
72 views

How to scp all files of a certain owner?

I want to scp all files of certain owners. For example, if this is my ls -la output: -rw-rw-r-- 1 owner1 ad 704 Jun 1 18:16 file1 -rw-rw-r-- 1 owner2 ad 798 May 29 11:15 file2 -rw-rw-r-- 1 ...
3
votes
2answers
193 views

change file size format when using stat

The formatting character %s makes stat print the filesize in bytes # stat -c'%A %h %U %G %s %n' /bin/foo -rw-r--r-- 1 root root 45112 /bin/foo ls can be configured to print the byte size number ...
5
votes
6answers
127 views

How to find out whether two directories point to the same location

Do the following paths point to the same disk location? /home/username /app/home/username
4
votes
4answers
446 views

How can I get the size of stdin?

I'm about to compress a large directory and I want to know how large, exactly, the resulting file will be. I've tried using du: $ tar -cv dir | du -h - du: cannot access '-': No such file or ...
2
votes
2answers
51 views

Selecting a random sample from a directory tree

I've got a directory that contains directories that contain directories that contain files. I'd like to select two files at random from each leaf directory. I found this question about selecting ...
2
votes
1answer
102 views

Batch Extract & Repack .RAR Files

I'm dealing with a large amount of password protected .rar files which need to be repacked to remove the password. (The password is known.) I was wondering if there was a script to batch/recursively ...
3
votes
2answers
425 views

Why can't I delete this file as root?

I have directory exam with 2 files in it. I need to delete files but permission is denied. Even ![rm -rf][1] command can't delete these files. I logged in as a root user.
1
vote
3answers
111 views

Script to move one filetype and create a subfolder, if it exists?

I'm trying to find a script that would basically look recusively at a directory, and if the script finds file that are .flac files, it will create a subfolder called FLAC in that same folder, and move ...
3
votes
2answers
59 views

Use USB to synchronize large directory between two disconnected servers

I'd like to synchronize a large directory between two disconnected servers with a USB device that's too small to hold the entire directory. Each server has a majority of the data and the changed files ...
1
vote
0answers
28 views

Is there any considerations I should take when running untrusted apps as non-root user?

I have to use an application I don't trust (unstable) and I will run it as a non-privileged user so if something bad happens the damage would be limited to the home folder of that user. I removed ...
2
votes
2answers
156 views

Copying latest file from remote server

There is a collection of .doc files, in addition to other types of files, on a remote server (which supports SCP). I am trying to write a script to retrieve the latest (most recently modified) .doc ...
2
votes
1answer
125 views

NFS permission problem with secondary groups

I have a server running Debian 7 that exports an NFSv3 share, and a client running Centos 5 that accesses it. This works fine, except for one issue with permissions based on non-primary groups. When ...
2
votes
1answer
82 views

Get all filenames in a directory created before input date

I have a directory containing lots of files. The output of ls command is -rw-r--r-- 1 nobody nogroup 427494 May 26 13:59 14_20150526065238928590_102.txt -rw-r--r-- 1 nobody nogroup 2113592 May ...
0
votes
1answer
27 views

Execution bit not being set [duplicate]

I have just set up an EC2 instance to play around with and am testing file permissions; however, I notice that the execution bit is not being passed down to the lower level (read and write are, just ...
3
votes
3answers
96 views

Copying a Parent Directory into a Subdirectory Without an Infinite Loop

For application specific reasons, I need to copy an entire parent directory into a subdirectory. E.g., cp -r ../ tmp/ The problem with this is that it gets stuck in an infinite loop, recursively ...
3
votes
3answers
45 views

Is there a way of listing all the instances when a particular file was modified/edited?

I currently have a file abc.txt. I am curious to know if it is possible to see all the instances when this file was edited, from the date it was created? Q: How can I make it possible [if I would ...
1
vote
2answers
93 views

Find largest files of a particular owner

I accidentally chown'd my entire file system to a particular user, after correcting the issue I've found disk space still being consumed by that particular user's files even though their account ...
3
votes
3answers
98 views

How to change suffix of the files

In a directory structure which has multiple subfolders and files in it. Some of the file names have the suffix _create (e.g. java1_create) and some of them with _bak (java2_bak). I need to rename ...
4
votes
4answers
548 views

grep command not working in conditional statement

I've a bash script that's supposed to go over all the filenames and print them only those that contain a certain letter (let's say it's 'o'). What I've done: command=`ls -l` for file in $command do ...
4
votes
4answers
384 views

Move files by date into different directory using CLI

I have a large number of pictures from an old hard drive that I'm trying to organize. If I run ls -l, I notice all of these files have a creation date of 2012 or before. Ideally, I'd like to move ...
1
vote
1answer
81 views

Comparing a bunch of files on different folders

I have two folders with 200 txt files each, all files named like file1.txt, file2.txt, file3.txt, etc., on both folders. Is there a way to use one command to compare file1 in both folders, file2 in ...
0
votes
1answer
25 views

Returning last-written file, containing particular sub-string in file name?

Whilst monitoring logging I have to go to my log files, order by written date, so I can then see the name of the log file for the most-recent execution of my application. Is there any way, given a ...
2
votes
2answers
73 views

How do I check which files are written by an application?

On my system, sar reports an average write to disk about 5MB/s. Using dstat I found that it's not so permanently, but there are peaks to 30-50MB/s, and then are sleeps. Using iotop i found that most ...
0
votes
2answers
71 views

Error in file comparison - awk [duplicate]

I have two files file1.txt, file2.txt. I want to select records which are common to both file1.txt and file2.txtbased on column 2 and column 3 and copy them to out.txt with additional column(column 4 ...
1
vote
1answer
55 views

Generating a long sound file with SOX without actually playing the tone

I know how to play a tone for a specific amount of time using SOX. play -n synth 5 sin 347 I know how to save a tone using SOX. sox -n note.mp3 synth 5 sin 347 Question is : How can I save a ...
4
votes
4answers
125 views

Stable sort a file by presence of ordered substrings on each line

I have a list of sound sources that I'm processing with a script. An example would be: alsa_input.usb-AVEO_Technology_Corp._USB2.0_Camera-02-Camera.analog-mono ...
0
votes
2answers
50 views

Change the owner of a file I can write to

I have a folder called fruit with permission 777 and its owner is fruit. I want to create a folder named apple under the fruit folder. But I want to set this folder's owner as apple, not fruit. ...
0
votes
2answers
75 views

Generate a list of installed PHP extensions

My goal is to write an as simple as possible (but not more simple) that generates a list of currently installed PHP extensions (*.so files) that the user can simply copy/paste into their php.ini. It ...
1
vote
1answer
107 views

sort file based one colum and group by another column

I have a file of three columns: 1 A 0.5 2 B 0.7 3 A 10 4 C 4 5 B 4 I want to sort the file by increasing order of column 3 and group by column 2 1 A 0.5 3 A 10 ...
1
vote
2answers
71 views

Compare three files: lines present in one, but not in the other using column comparison

I have three files file1.txt, file2.txt, file3.txt and they are of same format(same number of columns with same data type). I want to select records from file1.txt which are not present in file2.txt, ...
0
votes
1answer
59 views

Delete excel files which are older then 1 month

I need to delete excel files which are older then 1 month. need to set cronjob. any suggestion for this? which script can be used to search excel files from particular directory and delete them.