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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5
votes
2answers
209 views

`sudo cp -a` changes ownership to root (instead of preserving the original user)

I was trying to backup some directories and some of the copies made by sudo cp -av resulted in being owned by root while others preserved their attributes. Is this a known issue or am I missing ...
2
votes
1answer
50 views

How to create a zip of directories -mtime -150

I want to zip the directories, sub directories, files in main and sub directories from today till 150 days ago. I only consider the date of the directories where I am running the command, no matter ...
2
votes
4answers
339 views

Replace regex match with string containing match

I have a file with text as Afghanistan=+93 Albania=+355 Algeria=+213 American Samoa=+1 Andorra=+376 Angola=+244 It has all the country list and its dialing code. I want to replace: Afghanistan=+...
1
vote
4answers
307 views

How to move all files (excluding sub-directories) from one directory to another?

How do you move all the files (excluding sub-directories) from one directory to another. I'd prefer if the solution used just basic shell scripting.
3
votes
0answers
116 views

Get consistent encoding for all files in directory

I have a directory containing lots of csv files from various vendors with two different encodings: ASCII Text / UTF-8 UCS2 / UTF-16 little endian I'd like to use grep, awk, sed and other utilities ...
0
votes
3answers
199 views

What is the difference between a directory name that ends with a slash and one that does not? [duplicate]

Is there any difference between a directory name such as mydirectory and mydirectory/ I noticed this happens when I execute ls in some directories - some of the directory names have a slash and ...
2
votes
2answers
339 views

How to remove a file that can be seen but no program can seem to touch?

I'm trying to remove some obsolete backups, and deep inside one I've found a file 'cifs3bee' that I can find no way of removing. (And since I can't remove it, it's preventing the removal of the entire ...
0
votes
2answers
92 views

Merging large data set in fastest possible way

I have a large data set ~100 GBs having smaller csv files ~ 100,000. I wish to merge all .csv files together in the fastest possible way. Files are located in two different folders. Someone ...
1
vote
1answer
64 views

What are the default file permissions in CentOS?

What are the default file permissions in CentOS 5, CentOS 6 and CentOS 7? Is there any difference in the default file permissions between these OSs?
1
vote
4answers
239 views

change last 10 characters of the base (not extension) of multiple files

I have many files of different lengths but the same extension and I have tried many commands to rename all of them at once. Is it possible to change only the last 10 characters of the base of all ...
1
vote
0answers
258 views

extract text to csv file from output of reading multiple files into specific rows

I am trying to write a bash script to generate a csv file from text within multiple pdf documents. I have a script for converting pdf to text, but not for generating the csv file. Each text document ...
19
votes
7answers
2k views

Why compute checksums of downloaded files?

I often see a checksum given next to a file available for download. The purpose of this practice eludes me. It is obviously to detect corrupt files, but what could be the cause of this corruption and ...
0
votes
1answer
73 views

Operation of “mv” described in “Advanced Programming in the UNIX Environment”

In Advanced Programming in the UNIX Environment (book) Section 4.14, interpret the i-node and directory, there is a paragraph: When renaming a file without changing file systems, the actual ...
3
votes
7answers
338 views

for loop in bash lists dot and double dot folders [duplicate]

for f in ~/common/.*; do echo $f done The entries listed are, /home/sk/common/. #undesired /home/sk/common/.. #undesired /home/sk/common/.aliasrc And i am putting a ugly ...
-2
votes
1answer
101 views

Create five copies of file with the same inode number

How can I create five copies of /etc/profile with the same inode number?
7
votes
2answers
276 views

Sorting a file with integer in parentheses with no space

I am trying to sort a file like this (which is a list of subroutine names) cfn=(1370) __lib_file_MOD_file_open fn=(1368) __universe_MOD_general_boot fn=(916) __universe_MOD_general_main fn=(6142) ...
0
votes
4answers
116 views

given a file, find where within a subdirectory it was copied to

Given a file that I know has been copied into a given directory, I want to find the exact path where the file copy now resides. It is guaranteed the file has not been edited and will look exactly like ...
3
votes
2answers
287 views

remove whitespace from all items in a directory and sub directory

I have a directory which contains files and sub directories, some of which have whitespace in their names. Further more each of these sub directories contains files with whitespace in their names. Is ...
2
votes
1answer
67 views

How to tar-bzip old files in yearly groups

I wish to know a command I can use to grab and archive all files for a year at a time. I am working on a directory that has 72000 files, with files dated from 2007 to current. And I wish to make that ...
0
votes
0answers
224 views

How to check if the shell script created a new error log file in a folder with the same shell script? [duplicate]

I am trying to check if the new file is created in the specific directory or not when I run the shell script. Here, I am creating a new file through the shell script itself and then checking whether ...
3
votes
6answers
157 views

How one can re-read image with dd so it will match one you just wrote?

I have a ~1GB image that I'm writing to a 8GB SD card via the dd tool. I'd like to verify that it was written without corruption by reading it back and comparing its hash with original one. Obviously,...
1
vote
1answer
103 views

Delete all files to which no corresponding file with another extension exists

My goal is to find a Linux command sequence, which deletes some files if a special condition is fulfilled: All files with the extensions .cut or .cut.bak in the current directory shall be removed, IF ...
3
votes
2answers
317 views

Is there any Linux command to create a new file in a folder and auto create this folder if not exist? [duplicate]

I know this problem can solve by use combine mkdir and touch commands. But I want to know is there any other solution only use one command.
0
votes
2answers
208 views

How to find file without knowing the name of it [duplicate]

So I've finally given up after searching/trial and error for an hour now on how to find a file given specific criteria (none of which is the name of the file or the extension). The file info provided ...
23
votes
4answers
4k views

What is so special about Linux permission 004?

I was reading Practical Unix and Internet Security, when I came across the following lines which I couldn't comprehend. If you are using the wu archive server, you can configure it in such a way ...
3
votes
0answers
26 views

Specify the format of application temp/backup files in kde

Many text editors will create temporary or backup files with the format <filename>~. Because of this, folders appear very cluttered with tons of files duplicated in this way ( <original> &...
2
votes
2answers
290 views

Sort files with a specific extension by modified time and store them into an array

I have found many answers to sort the files of directory and even to save them in an array. Sorting Example ls -t Directory listing in array array=(*) My particular problem needs to sort files ...
2
votes
1answer
147 views

Using Btrfs to eliminate corrupted archives

I am trying to get my personal filesystem in order I want to tar everything and get it organized into proper directories I have many HDDs and a few SSDs I want to use Btrfs with it's checksum and ...
0
votes
1answer
115 views

Can I use lzma compression, without using “tar”, on OSX 10.10.3?

I kind of think of OSX as Unix by another name. But, if I need to move this to the Apple forum, please tell me! I can create tar files compressed using lzma as such: $ ls ./DbDumps alpha.dmp ...
0
votes
1answer
40 views

Copying directories to directories with different names

How can I copy a number of directories: directory_01 directory_02 directory_03 to different directories tmp_directory_01 tmp_directory_02 tmp_directory_03 where each tmp_directory_* directory ...
0
votes
2answers
45 views

Why is there a minor number in /dev for directories such as pts?

This is a part of /dev in CentOS 6.6. What is the meaning of the minor number for directories like ., .. , bsg, block and ... ? drwxr-xr-x. 18 root root 3800 Jul 3 06:00 . dr-xr-xr-x. 21 ...
1
vote
1answer
52 views

Delete the first n bytes of a file in O(n) time

I've been browsing around looking for a solution for a personal project (Read: a coding experiment), but nothing quite seems to fit. To be honest, I don't even know if it's possible. Now, there's ...
1
vote
2answers
192 views

What is going on with Google Chrome and deleted files

Debugging some CouchDB problems, I was looking for (still open) deleted files: $ lsof -nP | grep '(deleted)' And to my surprise I found that Google Chrome has around 16900 such files: 15870 files ...
0
votes
1answer
67 views

Creating an symbolic link in /bin automatically creates a second link in /usr/bin and the which command chooses /usr/bin

I just created an executable: ln -s /path/to/script.sh /bin/script then I check if everything succeeds and it does(/bin/script is created) but this has also created: /usr/bin/script and if I ...
13
votes
5answers
1k views

How can I count the number of lines in a file after a grep match?

I am trying to count the number of lines after a problematic row in a csv file. I am aware I can use the grep -a # syntax to output # number of lines after a match has been found. I'm only interested ...
1
vote
1answer
189 views

Move files from multiple directories to another system

Let's suppose I have a folders in the source system: AB1, AB2, AB3. And I have the same folder names AB1, AB2, AB3 in the destination system. I want to move AB1 files to AB1 and AB2 files AB2 and ...
1
vote
0answers
46 views

How should I distribute files/packages/software across multiple drives?

I am primarily a Windows user, but I am starting to use Linux more as I realize all the features it has. In Windows, I install my software that I use regularly on my 120GB SSD, along with the OS, ...
0
votes
1answer
961 views

How to clear log files periodically?

I am new to shell scripting. I want to clear log files in a directory based on the dates. I have managed to gather this code: DIR1='/home/u01/app/oracle/servers/DIR1/logs' DIR2='home/u01/app/oracle/...
0
votes
2answers
38 views

Where should startup scripts for a specific user be installed?

I have one script that will run when a specific user logs in. Where should this script and its assets be placed? I was planning to put it in /usr or /bin or /var, but I was wondering if there's a ...
0
votes
1answer
38 views

Directory Permission Order [duplicate]

In Linux, let us assume we have a directory with the following properties: drwx---r-x 29 user1 group1 4096 Jun 22 14:11 dir1 can I, as user2 having group group1, navigate into dir1? Since ...
2
votes
3answers
163 views

Delete several sequential file names, but ignore part of the first

Sometimes, my scripts get trapped in infinite loops. When the loop creates new files, things get messy. I currently have this file name format: Task.4883.store.log where 4883 is a counter. I ...
1
vote
2answers
85 views

How do I test if my variable is not in a set?

I am trying to modify the bash shell script and need some assistance. I have a directory with a bunch of files. What I need is to go through the files in a loop and if the file name not in a specific ...
2
votes
0answers
204 views

Process exceeding max open files limit

I am counting current open files by a process pid by :- cmd1:- ls /proc/$pid/fd/* | wc -l and then I am calculating percentage by fetching Max open Files limits. cmd2:- $ cat /proc/$pid/limits ...
1
vote
2answers
3k views

ldd says not found but .so file is in /usr/lib

When I type ldd with my executable file there is one not found warning. libCmp.so => not found libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0xb6ed7000) libm.so.6 => /lib/...
1
vote
4answers
511 views

Find text in a file and copy it to another file

Is there any command in Linux to find text in a file and if found then copy it in another file? Using sed -i we can find text but how to copy whole line in another file?
3
votes
2answers
535 views

Script for changing modification time of files and directories recursively

I have many big folders with thousands of files in them and I want to use touchto set their modification times to be "original time"+3 hours. I got this script from a similar thread in superuser: #!/...
1
vote
2answers
60 views

How to add some characters to filename via 'rename'?

For example I have a file named 5.jpg. How can I rename it to aaaaa.jpg with char a 5 times. I tried rename -v 's/(\d{1,})/a{$1}/g' * but this renames 5.jpg to a{5}.jpg, which is not what I want. I ...
-1
votes
1answer
34 views

How can I limit a log file to a certain number of most recent logs?

I know that you can limit the size of a file in respect to bytes, but I was wondering if there was a way to limit the number of logs within the file to, for example, the most recent 200 logs.
1
vote
1answer
203 views

How do I make 'sudo ll' work? [duplicate]

Every once in awhile, I find myself needing to list files in a directory that I don't have execution permission on. So I do a sudo: >sudo ll /opt/mydir [sudo] password for civfan: sudo: ll: ...
1
vote
1answer
59 views

How do you use 'find' to update ownership of all directories, files, and symbolic links in a folder?

I'm trying to update the ownership of everything in a directory tree from me to root. I'm using find to do it a little more carefully than a recursive chown. Here are the commands I use to change ...