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

learn more… | top users | synonyms (1)

0
votes
0answers
27 views

How do I hook an application and find out what files it writes while running? [duplicate]

I'm not sure how to exactly word this question, because my searching hasn't yielded anything that describes my situation what I'm looking for. Say my friend writes an application and sends it to me ...
1
vote
1answer
24 views

How do permissions on a directory affect files in it?

I just learned something that shocked me, because I did not have a clue it was a fact. If I have a directory with the following permissions: user@host:~$ ls -la testdir total 8 drwxrwxrwx 2 user ...
1
vote
3answers
117 views

Cannot remove <file>: No such file or directory

I just ran some self-written program in which I make files and fill them with stuff. However, I did something wrong (or at least, not as intended) with the name generation and now there are four files ...
-1
votes
4answers
133 views

Why does linux use file extension to decide the default program for opening a file though it's independent of file extensions

I have a text file as- abc.text and it has its contents as Hi I'm a text file. If I double click to open this file, then the files is opened in gedit editor. Whereas, if I rename the file to ...
0
votes
1answer
44 views

Compare and tar file for 2 date formats from filename

I need to keep files 4 months from now (3 previous month + 1 current month) in directory and tar the rest. But the problem is my files consist of different format. StockList_03-01-2015.txt ...
-1
votes
2answers
55 views

Finding the number of files in a folder [duplicate]

How can I find a number of files in a folder, assign it to a variable, then echo that variable, all in one command line?
-1
votes
2answers
35 views

Can we recover the data which has been truncated [duplicate]

Can we recover the data which has been truncated by >hello.log. Please help.
3
votes
2answers
256 views

Alter certain bytes in many files

I need a large number of damaged .png files in order to test my project. To that end, I need to set all bytes from the 0x054-th to the 0xa00-th to 0. .png files contain chunks with checksums, I want ...
-2
votes
3answers
60 views

Move files based on filename into directory Year/Month/Day

I have files in the format YYYY_MM_DD_HH:MM:SS.swf that dump into a folder /home/user/dump/ I want to move these files into a new directory tree /home/user/save/year/month/day/ based on the ...
3
votes
2answers
430 views

Alternate solution for making multiple copies of a single file using command line?

I am trying to copy a file to 10 files. Say for example I have a E-mail message named test1.eml. I want 10 copies of the same file. When I searched in internet, I came across this stackoverflow ...
0
votes
2answers
34 views

Vim writes to file without having permissions [duplicate]

$ ls sess.vim -lh -rw-r--r-- 1 root root 11K Feb 26 18:52 sess.vim I want this file to be readable for everyone and writable by no one (except by root). Thus I set its permissions to ...
3
votes
3answers
51 views

I want to grep out a text string from many files, how can I run a loop for this

I have a thousand .xyz files, all numerical data and in the same directory. Some of them have the text string "END" at the very end of them. I'm not sure how to loop a grep command so that it removes ...
0
votes
1answer
27 views

Alias for checking if folders in one directory exist in another

I'm trying to create an alias that will check if all of the folders in one directory are also in another directory and if not, tell me which ones aren't. This is what I'm trying: alias ...
3
votes
4answers
88 views

How to delete a specific number in file?

I have a file: 1 2 5 6 8 0 0 0 0 1 2 5 6 8 0 0 0 0 1 2 5 6 8 0 0 0 0 1 2 5 6 8 0 0 0 0 I want delete all zeros: 1 2 5 6 8 1 2 5 6 8 1 2 5 6 8 1 2 5 6 8 I tried tr -d [:0:]. Unfortunately, it ...
2
votes
3answers
58 views

Suppress filename from output of sha512sum

Maybe it is a trivial question, but in the man page I didn't find something useful. I am using Ubuntu and bash. The normal output for sha512sum testfile is <hash_code> testfile How to ...
-4
votes
1answer
37 views

linux error flag in permission denied thing [closed]

Even after running the command sudo chmod -R 777 /home, I cannot fix the error: Sorry, user kumarht1 is not allowed to execute '/bin/chmod -R 777 /kumarht1' as root on host.com. How should I fix ...
50
votes
8answers
6k views

On Unix systems, why do we have to explicitly `open()` and `close()` files to be able to `read()` or `write()` them?

Why do open() and close() exist in the Unix filesystem design? Couldn't the OS just detect the first time read() or write() was called and do whatever open() would normally do?
-2
votes
2answers
56 views

How do I keep the /lib folder clean?

I have been installing libraries for use with c programs. Is there a way to keep the /lib folder clean? Can I use subdirectories, links, etc to manage this? It's getting pretty cluttered, I'm not ...
1
vote
1answer
50 views

Access directory by modification date

Is there a way to refer to a directory by its modification date, like cd ~/$newest/subdirectory? I know that I could (and shouldn't?) parse ls, and I currently just use a hacky script that generates ...
1
vote
1answer
21 views

Set maximum number of processes started by incrond

I am using incrond to monitor a directory for incoming files. After each file arrives in the directory a python script is called to process it. A problem arises when the rate of incoming files is ...
3
votes
2answers
43 views

How to copy modified files while preserving folder structure

I have made many changes to files in my PHP project and I want to push those changes to our server via FileZilla FTP. Rather than push all of the files, I would like to find only the files that have ...
6
votes
1answer
535 views

Check last time .sh file used

When you run ./myscript.sh is that considered as "access" time? I need to know the last time a script was run, but I'm not sure if this counts as mtime, ctime or atime (differences described here).
5
votes
4answers
280 views

Join two files on two common fields

I have two files file1.txt 78Z|033333157|0000001|PERD1|2150421|D|0507020|3333333311 78Z|033333157|0000001|PERD0|2160208|A|1900460|3333333311 78Z|033333157|0000001|RSAB1|2150421|D|0507070|3333333311 ...
2
votes
1answer
62 views

Does adding the content at the start of file result in updating all the data blocks?

In the Unix File system (UFS), the file is represented as an inode structure which has 15 pointers that reference the direct blocks or indirect blocks. Taking the below images is an example. Each ...
4
votes
3answers
201 views

Copy only certain file types from a folder structure to another

I have a top folder with many sub-folders. It's named "a". There are many .png and .jpg files in there. I'd like to recursively copy "a" into a new folder "b", but only copy the .png and .jpg files. ...
2
votes
2answers
82 views

sudo tar changes extracted files ownership to unknown user

I am running this command: $ sudo tar xvzf nexus-latest-bundle.tar.gz The extracted files belong to an unknown (1001) user: drwxr-xr-x 8 1001 1001 4096 Dec 16 18:37 nexus-2.12.0-01 ...
0
votes
1answer
51 views

Can we merge binary files without any copy operation by handling filesystem?

I would like to merge efficiently binary files using a shell command and I quickly found classical ways like this one : cat file1 file2 > file3 Not bad but : It's slow. IO access are slow. It ...
1
vote
2answers
45 views

To find the size of some group of files

I was trying to find out the total size of all files which are owned by a particular user. While trying so, i get different sizes when executing different commands. Which command is correct to find ...
-2
votes
1answer
31 views

How to get files from broken directory? [closed]

I created some files and directories on external NTFS HDD using Ubuntu. Some folders displayed with cross sign, I changes permissions for them (777), now they just as a files. Copying of directory ...
1
vote
1answer
57 views

Search a string in files in the current directory, omit duplicates

Assuming I want to write a line which prints out lines which match a specific string without repeating duplicate lines .. I want to search for this string in the files of the current directory: grep ...
0
votes
0answers
15 views

Script to combine two files output to parallel output [duplicate]

I would like to get it so that: $ cat file1.txt a b c $ cat file2.txt 1 2 3 results in: $ cat out.txt a1 b2 c3
1
vote
1answer
25 views

Bourne Shell do while loop returns all the data but has two errors no such file or directory and repeats the shell name

The idea of my loop is to print the first digit of every line of a file. The file being this: 256-56-8411 Bob 3.61 Junior CS 471-44-7458 Tim 3.45 Senior CE ...
0
votes
2answers
30 views

Executable file isn't “really there” after rsync [duplicate]

I am issuing the following rsync command (obfuscating the exact path & host), which should copy two binaries: rsync -e "ssh -p 443" -a --info=progress2 -z user@remote:/srv/cgi-bin/ . ...
0
votes
2answers
77 views

Help creating script to move files based on date or filename

I have an FTP process that is constantly putting files into a directory. The date created is part of the filename in a format like this: YYYY-MM-DD-HH-MM-SS-xxxxxxxxxx.wav I would like to move the ...
4
votes
6answers
115 views

Sort files by highest number in filename

I've got a bunch of files all named like this: name_file-1.txt name_file-2.txt name_file-3.txt some_other_file-1.txt some_other_file-2.txt There are thousands of different filenames, some with just ...
0
votes
2answers
30 views

Bulk rename, change suffix? [duplicate]

How can I bulk replace the suffix for many files? I have a lot of files like NameSomthing-min.png NameSomthing1-min.png NameSomthing2-min.png I would like to change all them to NameSomthing.png ...
0
votes
3answers
83 views

get IP address who modified a file

I am looking a way to to get the history of a file, like the modification date, who modified this file (ip address or username), the changed lines Is there a way to get the IP address or username of ...
0
votes
1answer
24 views

Extract field values values from log file

How to extract the specific field values from log file using unix command. For example my log file contains, ...
0
votes
0answers
18 views

Script acting as textfile, possible? [duplicate]

A program I'm running has a -logFile option. The file I set as a logfile is filling up quite rapidly, and I only need about half of what's actually in it. Is it at all possible to: have a script ...
1
vote
1answer
56 views

Get the real, apparent size of a folder

I am using the du command in order to get the size of the folder. As I am interested in the actual size I ended up with the following command: du –sh --apparent-size <someFolder>/ In this ...
3
votes
2answers
47 views

When can I omit the dot character that indicate the current directory

Should I use dot to indicate the current directory for accessing directories or should I use it for files only? For example, if the current directory is foo and it contains bar directory and baz.txt ...
-4
votes
4answers
65 views

Write file names in to a file

In a directory I have X.txt,Y.txt,Z.txt files. I want to move these filenames into a single file like below: Out_file.txt X.txt Y.txt Z.txt Any unix command to achieve this?
0
votes
2answers
34 views

How to change the first column of data in a file?

I have .data file containing a table of numbers with the column format: m x y z vx vy vz separated by tabs, with a depth of 2000. The file name is initc.data. I want to change ...
1
vote
1answer
36 views

Wipe files from an external hard drive but not empty space

I'm using the following command to wipe an external drive. sudo shred -v -z -n 1 /dev/sdb Is it possible to wipe an external drive of the files and not empty space? So it would overwrite where ...
1
vote
3answers
127 views

Finding and removing words beginning / ending with numbers

I have a large file (>10000 lines) that contains one word per line, with a newline character after each word. The words contain no spaces. I'd like to list (or even better, output to a new file) any ...
0
votes
1answer
61 views

linux compare text file [duplicate]

I have file1.txt and file2.txt, both contain URLs, I want to create a new file with the unique URLS present in file2.txt and not in file1.txt. Example urls file: aspencabinets.com.au iiatca.org ...
0
votes
0answers
20 views

meaning of !(something) in shell [duplicate]

While searching for a way to move all files in a dir to one of its sub-folders, i came across mv !(something) something which should do the job - but only in bash. However i could not find why. in ...
2
votes
1answer
51 views

Information leaks out of encrypted file system

If I only encrypt the home directory, what are some common ways for information to leak out to the unencrypted part of the file system? Aside from the obvious problems like swap space files in /tmp ...
1
vote
2answers
54 views

How to remove prefixes and suffixes from filenames in a given directory?

I have many files with the same prefix and the same suffix. I want to remove both from filenames. Both contain spaces. So foo bar XXX doo par.jpg, foo bar YY YY doo par.jpg would become XXX.jpg and ...
1
vote
3answers
39 views

Run a command over directories with name recursively

I have the following directory structure in AIX. codeRepo/REPO1/AREA1/objects codeRepo/REPO1/AREA2/SUBAREA1/objects codeRepo/REPO1/AREA2/SUBAREA2/objects From codeRepo I want to run chown myUser * ...