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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2answers
4k views

Printing and deleting the first line of a file using `sed`

I can print the first line of a file using sed -n 1p file.txt I can delete the first line of a file using sed -i 1d file.txt Is there a way to print-and-delete in sed? Kind of like a FIFO pop() ...
2
votes
1answer
230 views

What does ^@^@^@ mean in a text file?

Sometimes I have problems with opening a file using a graphical text editor -- I'm using geany. The file can be read by vim without a problem. I checked the file, and there wasn't anything wrong with ...
2
votes
2answers
82 views

Why can users delete each others files in this case

I have two users : bob and sally, who resepctively own two files : bob100 and sally100: > ls -altrh /path/to/dir : -rw-r--r--. 1 bob test 0 Jan 7 12:59 bob100 -rw-r--r--. 1 sally test 0 ...
11
votes
3answers
6k views

find with -execdir

I run a find with -execdir both I don't get the results I was expecting. SSCCE below: mkdir -p a/b/c find . -type d -execdir touch foo \; $ tree a a ├── b │   ├── c │   └── foo └── foo Directory c ...
4
votes
1answer
898 views

file corresponds to /proc/locks

$ cat /proc/locks 1: POSIX ADVISORY WRITE 458 03:07:133880 0 EOF 2: FLOCK ADVISORY WRITE 404 03:07:133879 0 EOF The fields are: ordinal number(1), type(2), mode(3), type(4), pid(5), ...
5
votes
3answers
2k views

How to detect if a file is hidden

I have written this code as part of some coursework, where we have to create a recursive file counter without using the find, du or -R commands. This appears to work but always returns ...
4
votes
1answer
261 views

How to know what files got deleted?

I'm working on Ubuntu 13.04. yesterday from a Windows 7 partition, I accidentally deleted many files. I deleted by pressing shift-del. Is there any way to know the name of the files that got ...
6
votes
2answers
18k views

How to force overwrite non-empty directories using `mv`

I am wanting to move (not just copy) a group of files/directories to a different directory some of which have name clashes with files/directories in the target directory. My main objective is to move ...
0
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5answers
1k views

On executable files in Linux [closed]

It is said that in linux, unlike Windows, there's not a clear border between executables and other files. Well, in Windows, I write a C++ program, then it is precompiled, compiled and then linked to ...
4
votes
3answers
1k views

Can removed Debian packages have leftover files?

I noticed a weird thing in my /etc/init.d files and tried to look a bit what was going on. Here's my problem: # apt-file search /etc/init.d/minissdpd minissdpd: /etc/init.d/minissdpd # ...
1
vote
1answer
784 views

Recovering free space after zeroing out drive with sfill?

I was following a tutorial showing how to zero out the free space by using sfill . It only occurred to me after the fact that I did this that if the free space is zeroed out, then of course I don't ...
1
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3answers
11k views

How can I move a file to another user's directory?

I'm using CentOS 6 and I'm trying to move a file from USER A to USER B but I keep getting permission denied. What do I need to edit to allow to me to put files from one user's directory into ...
2
votes
3answers
3k views

Can't cat a file or make a directory: contradictory output?

I am getting output from a terminal in Ubuntu 12 that I don't understand. $cat sublime no such file or directory $mkdir sublime cannot create directory 'sublime': File exists How can both of these ...
3
votes
3answers
382 views

Downloading files over ssh based on a list of filenames

So here is what I have done already: I have a file called abc.txt which contains list of files. I am using abc.txt to move those files to a folder, tar that folder and finally I download the tar to ...
3
votes
3answers
3k views

How to delete 2 months back files in unix

Say I have below log files, AA_XX_20130719185428.log exec_xxx_cpb_20130712182453.log 13122013121327_AR_INC_DOBC_1.dprf.log 24122013_masterscript.LOG Date part contains both date and time. I want ...
0
votes
1answer
88 views

Permissions not extended to user in minecraft group [duplicate]

I have a directory, under /srv: drwxrwxr-x 3 minecraft minecraft 4096 Dec 30 06:23 minecraft Owned by user minecraft, group minecraft. Group has read/write/search permissions. I have a user, ...
3
votes
4answers
1k views

What command do I use to see the start and end block of a file in the file system?

Is there any command that will output the beginning and ending blocks of any file?
1
vote
1answer
103 views

Check standard output of a background processs in real time

Let us say I submit a process in the background and I want to see the stdout and stderr. In another post it was suggested: command > logfile 2>&1 & But when I do head logfile I do ...
1
vote
1answer
597 views

Auto detect new files and upload them [closed]

I'm starting work on a new project and I need to know the feasibility of the end-result. I need a lot of things to happen automatically. Detect if a new file has been added to a folder Login to a ...
6
votes
1answer
891 views

When do I use cp --attributes-only

Doing some study on basic Unix commands and trying to get an example when I want to use the following command line option --attributes-only for command cp here is from cp man page --attributes-only ...
3
votes
2answers
5k views

Identify and assign most recent file to shell variable

I have a directory of .jpg files that continuously grows. I want to copy the most recent one elsewhere. This is what I currently have and it works, just curious if there's a better way to identify the ...
1
vote
1answer
187 views

touch and tar from a text file

Am trying to zip a certain number of files and am stuck at below point, ls -lrt /lag/cnn/*/*/*/adb.tar.gz | grep -nri ABC >> sample.txt In sample.txt i got filesNames on which i have to do ...
4
votes
3answers
1k views

Parsing string token with bash

I have this output (from a previous command): aaa something bbb someother ccc blabla For each line, I would like to create a file whose name is the first token, and whose ...
2
votes
1answer
1k views

Error: permission denied on key 'fs.file-nr'

# sysctl -w fs.file-nr=131072 error: permission denied on key 'fs.file-nr' Same issue when I edit /etc/sysctl.conf and try sysctl -p. Any reason why I cannot edit this value? I am on CentOS 6.5
8
votes
2answers
218 views

Is the “computer:///” address only something symbolic, or can it be used somewhere?

I am using Linux Mint 15 (Mate). When I double click the Computer icon on my desktop to see the available drives, the address bar of file manager (Caja 1.6.1) shows this address: computer:///. Is this ...
6
votes
7answers
413 views

File protection in Unix

Is there a way to protect a file in such a way that even root cannot delete it or rewrite it after creating it? I have a file which is created by root under /var/log/ and I want to restrict all users ...
2
votes
2answers
406 views

Write In A File at Specific Location

I am trying to create a script that will add a user to the UserDir enabled list or will remove it from UserDir disabled list in userdir.conf. For the sake of my question, let's say I have the ...
-2
votes
1answer
45 views

Blacked out html folder in root directory [closed]

Just looking through my system's directories and wondering about some of the contents. There is a blacked out (inaccessible) directory called html. I'm thinkging this is a bad link? I'm guessing and ...
9
votes
2answers
3k views

What counts as a file modification or change?

Does renaming affect the file modify or access time? Is there a list somewhere of what changes which times?
1
vote
1answer
41 views

How to ignore files if there is an similar file with the same size?

I want to list the files in a directory, using ls. Typically, the files in that directory have the same name (except for the extension - one has extension .rej, one has .failed) . If a pair of files ...
32
votes
3answers
81k views

Sort based on the third column

I'm facing a huge 4-columns file. I'd like to display the sorted file in stdout based on its 3rd column: cat myFile | sort -u -k3 Is that enough to perform the trick?
-1
votes
1answer
197 views

Checking if folder exist using case/switch

Is it possible to use case to check if folders exist? I have these folders. I need to check if they exist then do something afterwards, I have 5 folders I need to check, and if it does exist, I ...
4
votes
2answers
1k views

File access time not updating in ubuntu 12.04

After using the cat command to read a file, I used the stat command to view it's changed access time, but it's not getting updated. I checked /etc/fstab file and there is no noatime on any of my ...
11
votes
5answers
9k views

How do you compare two folders and copy the difference to a third folder?

You've got three folders: folder current, which contains your current files folder old, which contains an older version of the same files folder difference, which is just an empty folder How do ...
6
votes
2answers
657 views

Create a computer lab using Linux [closed]

I would like to know, how I can create my own Linux lab, like the universities Linux labs. I mean OK, I can install for example Fedora to all my 4 PCs, but how I can login from different computers, ...
1
vote
0answers
174 views

Map invalid file paths to valid file paths

I am running a program on linux which access an invalid location, say: /home/area/file. I know the valid location is /home/area/something_else/file. The problem is the input file for this program is ...
0
votes
3answers
332 views

How to restrict one user files to another user

On my machine there are user accounts. My question is how to restrict access to ones user files. Meaning no one else can access my files at all. How can I setup this restriction? How many root users ...
3
votes
2answers
122 views

Is there any mitigation against touch date/time forgery?

I have been using touch -t to change time of a file when I started using Linux, is there any mitigation against touch date/time forgery? Like, echoing original created date and time, even after using ...
2
votes
2answers
293 views

Replicate a directory and file names n times

I have folder which has some data (files) in that with the name 201311261418 And a file 201311261418.eob In my scenario I need to replicate this folder and file names n times with the appended ...
1
vote
1answer
253 views

How to run the file-copy dialog of thunar, or anything similar to use?

I'm trying to create a Send To menu for thunar, which copies a file (%F) to a fixed location. In KDE4 I could use kioclient copy command, but what about other environment? Does thunar has something ...
3
votes
2answers
246 views

How can I monitor a file that fully recreates during its run?

This is a follow-up question of Why are some file changes not shown in tail -f? With the use of capital F: tail -F I can monitor the output of tail -F ~/.mysql_history from the manual: ...
3
votes
1answer
140 views

Why are some file changes not shown in tail -f?

I tried to follow the mysql history file with: tail -f ~/.mysql_history in another window I entered as the same user: mysql -u someotheruser -p and none of the following commands are shown in my ...
1
vote
3answers
15k views

What is the difference between binary file and .exe file? [closed]

Can anyone distinguish the difference between binary file and .exe file?
14
votes
2answers
41k views

Remove all files created before a certain date

I have a directory containing a high number of files (like logs for every day of the year). I would like to remove all files created before let's say 22/11. How can I achieve that ? Must I use find ...
4
votes
4answers
11k views

get age of given file

How can I get the age of a given file in, at least, days? I'm well aware of ls -lh and similar commands. I want something that will work sort of like this: getfage <FILE> # prints out '12d' ...
4
votes
3answers
676 views

What could be the use case of changing modified time of a file to the future?

I was reading through the man page of ls on UNIX, specifically OS X Mavericks. This got me intrigued: If the modification time of the file is more than 6 months in the past or future, then the ...
6
votes
1answer
740 views

Merge nonzero blocks of huge (sparse) file A into huge file B

I have two partial disk images from a failing hard drive. File B contains the bulk of the disk's contents, with gaps where sector reads failed. File A is the result of telling ddrescue to retry all ...
2
votes
2answers
118 views

What are the differences between split and rar?

I am used to raring files -- but I am looking for something faster. I see that there is a "split" command. How does this command compare to rar? What is are the differences between split and rar?
23
votes
2answers
3k views

Create a test file with lots of zero bytes

I know how to create an empty file: touch /var/tmp/nullbytes but how can I create a 1MB file that only contains nullbytes on the commandline with bash?
5
votes
2answers
3k views

Find file names that don't contain a specified string

I'd like to execute the opposite of: find . -name "*2013*" Find all the files in the current directory that don't contain the string "2013" in their names. How can I do that?