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

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9
votes
6answers
1k views

Modify a file without creating another file

Is there a way to modify a file without writing the contents to another file, without sed and awk? For example: $ cat test.txt aaa aaa bbb ccc ddd Replacing using sed with -i option, sed -i ...
3
votes
1answer
26 views

reserve disk space before copying files

I would like to reserve (or is the keyword "claim"?) some amount of disk space before an rsync occurs so other programs will believe a disk has less space (because after the rsync, the disk will have ...
0
votes
1answer
43 views

Copy last n-lines from one file to another

In the context of adding the same lines at end of the .bashrc or .vimrc files of several user accounts on the same machine, what would be an easy way to copy the last n-lines from one shell script to ...
1
vote
3answers
54 views

Is there a faster way to find specific files than using find?

I have to find in a folder the files not having certain permissions (755). The sub-directory has other sub-directories containing in total millions of files, and the find ./ -not -perm 755 command it ...
1
vote
1answer
38 views

Creating a virtual file whose contents are determined programmatically [duplicate]

Is it possible to create a virtual file in unix, whose contents are determined programmatically when the file is accessed, a bit like the files in /proc? For example, I have a program that retrieves ...
1
vote
2answers
31 views

How to know the path of a running executable?

I am working on a Linux server, and I running different jobs on different node. However, when compiling my program, I didn't set their specific name, so they are all a.out Now I found one of the ...
1
vote
1answer
36 views

How to organize files in Linux/Unix shell?

I would like to try to organize my documents, and I was told that I can do this using the linux/unix cygwin terminal. I searched for the command in google but all I ever did find was organizing the ...
1
vote
1answer
29 views

How to search recursively within several levels of embedded tar tgz files? [duplicate]

Can somebody help me to figure out a command to find a file recursively that is embedded in a tgz file which is within another tgz files recursively: MainFile.tgz → SubFile1.tgz → SubFile2.tgz → ...
0
votes
2answers
31 views

Create a list of files in a directory with a certain char

I would like to be able to list all files within a folder which have a certain character as the third character. For each file, I then want to be able to perform an action, maybe delete or move. ...
0
votes
1answer
23 views

Broken files after moving them back and forth [closed]

I have different partitions for / and ~, both with ext4 filesystems. In ~, I have a folder with many files, I tried to move the complete folder to the root partition mv ~/folder /folder/ In the ...
2
votes
1answer
28 views

According to what does GNOME purge the trash “30 days later”?

In GNOME 3.18 Settings > Privacy > Purge Trash & Temporary Files, one can configure the desktop environment to automatically empty Trash "after 30 days". The description here isn't very clear. ...
1
vote
3answers
33 views

Rename only one file in each directory, based on condition

I have 100 folders inside every folder I have one or two files named as the following: XXX_001_014_max.jpg XXX_001_024_max.jpg I saved the folders names in a file "list.txt" I ran the following ...
1
vote
0answers
22 views

How to remove a single quote from a file name? [duplicate]

I have some podcasts on my radio server which contain a timestamp when they should be played. I noticed one of them is put into single quotes 'filename.mp3', and I'm unable to remove them. Check this: ...
0
votes
2answers
28 views

File Size Limit

What is the maximum file size limit in rhel 32 bit OS, is there any OS limitation for the file size , if there is any limitation set then please tell me what will be for root & oaa.
1
vote
1answer
33 views

Creating if/than statement to move files to another location based on value of 1 column?

I have thousands of xyz (latitude,longitude,elevation) text files that I want to separate by latitude or longitude. How and what commands could I use to create an "if latitude(column1) is greater than ...
0
votes
1answer
25 views

Delete files between two dates

I have a folder in which there are very old files. It contains files since 2009 and they are dump files with error log. What I want to know is if it is possible to delete the files between let's say ...
6
votes
5answers
3k views

Simple, user-friendly GUI file finder?

simple, user-friendly = as Google search web page, one editbox, one button, nothing to explain, everybody grasps an idea in 1ms fast = finding files and directories by filenames, not by content (!) ...
0
votes
1answer
4k 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 ...
6
votes
1answer
225 views

Have a 'file' generate its content on demand? [duplicate]

Is there a way that I can have something which appears as a file, but when being read some code executes which fills the content of the file "on the fly"? Like FIFO/ named pipe, but without the need ...
1
vote
2answers
183 views

Aircrack-ng: No /pentest/passwords/wordlists/darkc0de directories

this is my fist question on this forum. I'm currently using Linux Mint 17.2 Cinnamon and trying to run Aircrack-ng to show the password of my own Wi-Fi connection, I got the Handshake too. The problem ...
3
votes
3answers
119 views

Add mtime to grep -c output and sort the output by mtime

I have a directory full of logs named in the following style: info.log00001 info.log00002 info.log00003 ... info.log09999 info.log My current output (using grep -c) I need to analyze the ...
1
vote
2answers
884 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
votes
1answer
51 views

Organize a file [closed]

I want to thank the great help and support. Well, I have the following file: name id alello chr pos snp s1 215 a 1 11 a215 s1 216 a 1 11 a216 s1 217 ...
-2
votes
1answer
63 views

When a particular file arrives then execute a procedure using Shell Script [closed]

When a particular file for eg: "abc.csv" file arrives into a directory for eg: "mydir", I need to execute a procedure using shell script. "There was a procedure which will load data from csv to table ...
1
vote
1answer
34 views

Interactive remove files listed with paths in text file

I am trying to interactively remove files listed with their paths in a text file. The command I am trying is: xargs rm -i <filelist.txt The error I get is: rm cannot remove ...
20
votes
7answers
38k views

Test if there are files matching a pattern in bash

I am trying to write an if statement in bash to test whether there are any files matching a certain pattern. If there is a text file in a directory it should run a given script. My code currently if ...
1
vote
0answers
23 views

How long does process wait for locked file? [closed]

If a process in a Unix based OS finds that a file is locked because another process is writing to it, how long does it wait and retry before giving up and returning an error?
2
votes
2answers
36 views

List all the files in ending with several file extensions?

If I want files ending with .fas I know I can do the following with ls command : ls -l /users/jenna/bio/*.fas and this lists out all the files ending with .fas. But how can I get files ending with ...
10
votes
5answers
35k views

Move all files with a certain extension from multiple subdirectories into one directory

I have a bunch of .zip files in several directories: Fol1/Fol2 Fol3 Fol4/Fol5 How would I do move them all to a common base folder?
0
votes
0answers
22 views

find and copy files change the modified date to 1980-1-1

I use command to find and copy files in cygwin in windows . My command is find -name '*.docx' -exec cp -p -t /word {} + however , when the files is copied to destination folder, I can see the ...
2
votes
1answer
831 views

how to find out the full path of the command from the result of lsof -i

lsof is a great utility, just now started using it. lsof -i | grep smtp => this give the following result. httpd.pl 212548 global 3u IPv4 893092369 0t0 TCP ...
0
votes
1answer
37 views

One liner to replace file contents [duplicate]

When I run base64 filename >> encodedfile the new content is appended to existing content. Is there any way I can replace entire old content with new content. Using any similar one line ...
1
vote
0answers
28 views

Access directory as a different user

On a Debian (Jessie) server provided by my university, I have a mounted directory (say it's /MagicDir) that can only be accessed by one user (say magicuser). Not even root can access this directory! ...
0
votes
1answer
28 views

How to implement config file expiration time?

I have a Debian server which runs a service using multiple config files (in a similar way to apache2) which I need to add an expiration date to. The config file that has an expiration date starts with ...
-2
votes
1answer
31 views

Copying files from multiple directories [closed]

I want to copy a single file from 10 different directories and append them in another directory.
1
vote
1answer
773 views

Apache created files and its permissions for CentOS 6.x

In short, I have an authenticated HTTP-POST that: posts a jpg image (created as 666 apache:www) into /directory1 (777 ftpuser:www) creates /directory2 (created as 666 apache:www) in a 777 ...
0
votes
1answer
34 views

linux - setting order in which files are read or output with utilities (sorting)

I'm having issues with programs reading files in the wrong order, and also outputting in an undesirable order with utilities such as ls. I've tried some of the LC_COLLATE options, but none of them ...
0
votes
1answer
31 views

How to execute a command for all mp3 files in a directory? [duplicate]

I have a directory with some mp3 files. I want to remove (almost) all ID3 tags using mid3v2 <file> --delete-frames=AENC,APIC,... for every mp3 file in the directory. Other files should not be ...
-4
votes
0answers
374 views

How can I locate package linux-headers-4.3.0-kali1-amd64

root@kali:~# apt-get install linux-headers-$(uname -r) Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package ...
1
vote
1answer
54 views

How do i open it .emz files on linux?

I want to view or open .emz file on Linux. EMZ file extension is a Windows Compressed Enhanced Metafile file. How i have to open this file. Any software required? I don't want to convert through ...
-9
votes
1answer
48 views

Unix “ls” command? [closed]

Can someone explain to me what are all the options available with the -la flags for the ls command ? I have read the man pages, but still not sure.
-1
votes
1answer
29 views

file transfer between host macine(win10) and virtualbox machine(centos 6.3)

I am trying to copy some files from my host machine to my virtual box machine centos. I tried vsftpd and share folder but it's not working. Please advise me on how to do it.
1
vote
5answers
54 views

Running commands on several files and giving each output a unique name

I want to run a script on all the files in a folder like this: sh script.sh *.fasta > output however I want the outputs to be in individual files for every input. So instead of getting 5 files ...
1
vote
1answer
572 views

rename files matching specific mtime value within directory

I use simple set of shell commands to in order to create mysqldumps daily. The script is called by cron daemon. It looks like: presentdate="`date +%d-%m-%Y_%H:%M.%S`" basedir="/var/db_my_backup" ...
-1
votes
1answer
58 views

Remove files with certain extensions and 0-length files

Want to know how we can clean the directory by removing all the files with a zero length , with a .tmp or with a .swp extension that found in this directory (note that sometimes .swp and .tmp files ...
9
votes
3answers
4k views

Are there alternatives for `dd`?

What other tools should I use to read and write files with truncation, seeking and skipping. dd's command line options seem inconvenient and foreign and I don't like choosing between slow, but precise ...
9
votes
4answers
21k views

Is it possible to compress a very large file (~30 GB) using gzip?

Is it possible to compress a very large file (~30 GB) using gzip? If so, what commands, switches, and options should I use? Or is there another program (preferably one commonly available on Ubuntu ...
0
votes
5answers
52 views

Remove the latest modified file

I have created two files: sample.txt and sample.txt  (the second file contains some hidden characters, e.g. a space). How can I remove the latest modified file? I'm using Linux.
1
vote
2answers
151 views

Read from and write to file from stdin and stdout

I need to continually read from and write to a (virtual) file in bash, without closing the file in between. I'm looking for a program which will open the file for read and write, read from stdin and ...
1
vote
1answer
38 views

“time > time.txt” refuses to work propely

I just started learning Linux commands. I was experimenting with the > command, that, as far as I understand, makes the command before it write it's output to the file after the sign. This ...