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

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14
votes
2answers
1k views

How do I “cat and follow” a file?

A file is being sequentially downloaded by wget. If I start unpacking it with cat myfile.tar.bz2 | tar -xj, it may unpack correctly or fail with "Unexpected EOF", depending on what is faster. How to ...
7
votes
1answer
92 views

Normal looking text file, detected by file as ASCII Pascal program text

I have a "normal" looking text file (contains english sentences) which is getting detected by file command as ASCII Pascal program text. How does Pascal program text differentiate itself from normal ...
3
votes
1answer
263 views

“file” command confusing C & C++

When using file to check some file types, I noticed that it seems to incorrectly label C++ files as C files: $ file User.* User.cpp: C source, ASCII text User.h: C++ source, ASCII text User.o: ELF ...
2
votes
1answer
826 views

Zabbix-agent: cannot stat 'filename.log': [13] Permission denied

I have installed Zabbix-server and zabbix-agent and trying to add trigger to check log file. But in /var/log/zabbix/zabbix_agentd.log I got the same error every time: 10832:20131008:125634.180 ...
4
votes
3answers
38 views

Local Account Creation Date

For compliance purposes there is the need to fetch information regarding local (user and non-user) accounts creation date on UNIX machines. Is there any way (even if it's not the most reliable or ...
2
votes
1answer
35 views

Copy file from USB drive to a desktop loaded via a LiveCD

I have booted my computer using a LiveCD and want to copy a file from a USB drive to the LiveCD loaded desktop. I want to copy a file from the USB drive to the desktop environment in memory, which ...
0
votes
0answers
32 views

Storage Formats for Flat File DB

Currently I use a flat file database with find -type f -ls to store information for about 400GB of files. I'd like to store also the md5sum/sha[1|256]sum of the files. Because the files are often ...
29
votes
7answers
2k views

How can I trick a process into thinking a file doesn't exist?

I have a program that stores its settings in ~/.config/myprogram that I use both interactively and with a batch queuing system. When running interactively, I want this program to use my configuration ...
0
votes
1answer
15 views

remove special character from files in directory

I need to remove special characters from all .htm files in a directory. Ideally I need to keep the file name but if I have to I can copy each file to 1 or something like that. Here is the command I ...
2
votes
1answer
42 views

Create directory using filenames and move the files to its repective folder

I have a folder with around 150 text files. I would like to create folders in the name of the 150 files. After that I would like the text file to be moved to its respective folder. Example names of ...
2
votes
0answers
57 views

ls does not show a hidden file (OS X)

I am using lsof to view the list of open files. One such file that it displays open is : Google 3864 malaykeshav 46u REG 1,1 470455334 32578671 ...
2
votes
1answer
24 views

move the search content to different directory

I am on Oracle Solaris. I am using: grep "searchstring" filename.* above command returns my search result. Now I want to move the all the files in above search result (all the files not the ...
14
votes
5answers
6k views

How can I do a “copy if changed” operation?

I would like to copy a set of files from directory A to directory B, with the caveat that if a file in directory A is identical to a file in directory B, that file should not be copied (and thus its ...
5
votes
2answers
103 views

Why does a grep reboot the machine?

On a RHEL 6.5 Desktop, if I use: sudo grep -r foo /* my desktop reboots. Q: Why?? How to debug this? It's the third time my Desktop reboots because of this :D
3
votes
1answer
592 views

Samba set share browsable only for a group

How I can configure samba to set browsable a share for a group only. I wanna hide the share for all other users, if a set browsable to yes all the users can see the share when explore. I don't want ...
3
votes
1answer
47 views

Can't create a+r file

Using Debian I am unable to create files that by default has read permission for all users. For example: # umask 0002 # touch test # ls -l test -rw-rw----+ 1 user user 0 Jun 25 18:18 test Is there ...
1
vote
2answers
36 views

Permissions under a 700 (rwx------) directory

If a directory /foo/bar/baz has 700 (rwx------) for its permissions, thereby making it inaccessible to all but its owner (and the superuser), does it matter what the "group" and "other" permissions ...
3
votes
3answers
2k views

Check whether files in a file list exist in a certain directory

The runtime arguments are as follows: $1 is the path to the file containing the list of files $2 is the path to the directory containing the files What I want to do is check that each file listed in ...
1
vote
1answer
32 views

Set file creation date to its modification date on OSX

I need to batch edit file creation date (some stupid audio recorder set the file creation date to UNIX epoch and the correct recording date in the modification date) to set it to the files ...
3
votes
2answers
49 views

Comparing files in unix columnwise

I want to compare two files with same number of rows and columns with records in same order. Just want to highlight the differences in the column values if any. file A: 1,kolkata,19,ab ...
4
votes
2answers
112 views

“no such file or directory” message when deleting a file that exists on NTFS

I have a directory with images. Suddenly I found out that there's a new image with a new name. The image content is similar to another image in another directory but with a different name. I didn't ...
3
votes
1answer
54 views

Monitoring filesystem activity

Say, I have a program, and I want to monitor its filesystem activity (what files/directories are created/modified/deleted etc.) This program may be capable of spawning further processes, and thus, I ...
4
votes
4answers
206 views

Redirecting Output of print to multiples files in awk

I want to print same lines to 2 different files. What I am doing right now is: print ID[i]" "Value[i]" "TS1[i]" "TS2[i] > "file1.txt"; print ID[i]" "Value[i]" "TS1[i]" "TS2[i] > "file2.txt"; ...
47
votes
15answers
13k views

Is there an easy way to replace duplicate files with hardlinks?

I'm looking for an easy way (a command or series of commands, probably involving find) to find duplicate files in two directories, and replace the files in one directory with hardlinks of the files in ...
3
votes
3answers
494 views

Splitting a large binary file into sections determined by context patterns

I have a large (2GB) file that looks like this: ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ <binary data> ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ <binary data> ^%%-=-=-=-=-=-=-=-=-=-=-=-=-=-%%^ ...
2
votes
1answer
917 views

Sphinx Search shutting down after `FATAL: accept() failed: Too many open files`

I'm running Sphinx Search Server V2.06 ( the latest stable release ) on an Amazon EC2 with Linux CentOS. In general it is running fine, but the searchd.log is showing this error over and over with ...
-11
votes
2answers
162 views

Count the number of executable programs in a directory [closed]

How can I count the number of executable regular files in the current directory in a shell script?
5
votes
2answers
677 views

More sophisticated file command for deep inspection?

Sometimes it seems that the standard file command (5.04 on my Ubuntu system) is not sophisticated enough (or I am just using it wrong, which could well be). For example when I run it on an .exe file, ...
1
vote
2answers
778 views

How to find human-readable information about file types recognized by `file`?

Searching, googling, I could not find any information about file types recognized by file. For example, an *.mp4 file is identified as "ISO Media" (while being able to play with VLC normally). This ...
6
votes
1answer
268 views

What could cause strange behavior in file(1) command?

What could cause file(1) command to output application/msword application/msword (yes, twice in a row) as the mime type for some of the .doc files? Normally it prints just application/msword. If run ...
2
votes
2answers
3k 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
0answers
64 views

How does fsnotify setting affect system performance?

Occasionally a software package I install complains that the default fsnotify setting is far too low for decent performance. Intellij IDEA or crashplan are two examples. They suggest using fsnotify ...
2
votes
3answers
146 views

How is it possible to do a live update while a program is running?

I wonder how killer applications such as Thunderbird or Firefox can be updated via the system's package manager while they are still running. What happens with the old code while they are being ...
2
votes
3answers
450 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
5answers
3k views

Gedit won't save a file on a VirtualBox share: Text file busy

I have a text file that I can change using other applications (for example openoffice). But when I try to change and save it using gedit, I am getting error from gedit: Could not save the file ...
16
votes
4answers
58k views

How to get over “device or resource busy”?

I tried to rm -rf a folder, and got "device or resource busy". In Windows, I would have used LockHunter to resolve this. What's the linux equivalent? (Please give as answer a simple "unlock this" ...
3
votes
1answer
62 views

Compose and pipe a gzipped tar archive in one go

I'm trying to come up with an effective way to create a gzipped archive of various system partitions on Android, piping everything out to stdout so as to be able to encrypt it as it comes across via ...
2
votes
3answers
258 views

User permissions problem Linux

Every time I create a new file from "eclipse", I need to run these two lines of code to get the r/w permission: chmod -R 775 /var/www/folder/filename.extension And/Or sudo chown -R ...
2
votes
2answers
669 views

How do I dereference links when extracting from a tar file?

If I have a tar file, bob.tar, which contains real_file and link_to_real_file, in which the latter is a symlink, is there a way to extract the contents of bob.tar so that link_to_real_file will not be ...
1
vote
1answer
43 views

Minimum file permissions to delete a file [duplicate]

To delete a file in Linux: What minimal permissions do we need to set on it? What minimal permissions do we need to set on its parent directory?
2
votes
3answers
36 views

File ID that doesn't change upon rename

I am trying to write a system utility script that will run as a cron job and capture file system statistics and environment settings in order to track as many changes as possible. Consider the ...
3
votes
6answers
457 views

Removing blank lines from a file

I want to remove all empty lines from a file. Even if the line contains spaces or tabs it should also be removed.
4
votes
3answers
113 views

zsh's “echo SomeText >> **/filename” in other shells

I need to fill all files with a specific filename (recursively) with a text. In zsh this can be done with echo SomeText > **/TheFileName I search generic solutions for sh-compatible and/or tcsh ...
0
votes
1answer
116 views

How do I cat a command file?

I have the output of the crontab -l stored in a file (crontab_file) with no extension. But whenever I try to cat it, I get errors saying command not found for multiple line of the file. Here is the ...
3
votes
2answers
98 views

Find files in directory with paired names

I'm running tests of a variable-size-and-contents test set. Data files are added and removed frequently. I'm looking for an automated way of gathering a file list. All files are in subdirectories of ...
2
votes
4answers
68 views

Get the latest directory (not the latest file)

My folder parent has the following content: A.Folder B.Folder C.File It has both folders and files inside. B.Folder is newer. Now I just want to get B.Folder, how could I achieve this? I tried ...
12
votes
5answers
13k views

How to list all files in the size order

I would like to list all files in the order of big to small in size and the files could be present anywhere in a certain folder.
0
votes
3answers
58 views

Looping the listing files in UNIX

I've given the command: ls -lrt and the listed files and directories are: drwxr-xr-x 4 root root 4096 Feb 2 2014 abc drwxr-xr-x 4 root root 4096 Feb 2 2014 cde drwxr-xr-x 4 root ...
3
votes
1answer
51 views

Protecting data against bit rot

I have realized that I need to protect all of my photographs against bit rot (file corruption occurring at random due to errors in hard drives or network transfer). I recently discovered par2 which ...
11
votes
3answers
538 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. ...