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

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1answer
225 views

TeXstudio: open file at line number n

I am creating a script to produce some .tex files with a lot of lines (a kind of automatic sample). The script finishes with texstudio /home/$USER/foo.tex where foo.tex is the file created before. ...
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2answers
400 views

Remove oldest folders + files (50GB) from a folder when share/HD reaches 95% full capacity

I have a big share (~5TB) that is getting full. Now I want to make a script that deletes data from 2 specified folders. But this need to be the oldest files/folders and it need to stop when ~50GB has ...
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3answers
4k views

Changing file associations in GNOME?

This blog post talks about how to change the default application to handle a file type in Nautilus for individual file types (right-click on the file, "open with", and select the new default ...
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2answers
607 views

Remove first instance of lines with duplicate field value

I have sha1 summed all the image files on my storage server and put the results in a text file in the form of: sha1sum filename I've sorted the file and removed all all unique sha1sum entries. So ...
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2answers
4k views

How to write a file at various offsets to a filesystem partition with dd command

Requirement I want to write a file at various offsets into the partition Partition /dev/part2 is mounted at /mypart I tried the command below: dd if=/dev/urandom of=/mypart/aaa bs=1024 seek=0 ...
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4answers
1k views

Checking for the existence of files against a list

I have a "command" text file that issues a data file download command on each line. I send the command file to bash. However, a small percentage of the downloads fail. Here is the algorithm I ...
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1answer
320 views

Check a bash variable against a file

I have a bash variable ($HTTP_COOKIE) which contains a string. I want to check if this string matches the content of a given file (token). I'm working on a busybox linux. How should I do?
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1answer
48 views

Comparing a bunch of files on different folders

I have two folders with 200 txt files each, all files named like file1.txt, file2.txt, file3.txt, etc., on both folders. Is there a way to use one command to compare file1 in both folders, file2 in ...
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2answers
51 views

Compare three files: lines present in one, but not in the other using column comparison

I have three files file1.txt, file2.txt, file3.txt and they are of same format(same number of columns with same data type). I want to select records from file1.txt which are not present in file2.txt, ...
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1answer
50 views

How to use convert command with bash to resize all images in a given directory?

I want to resize all PNG files in ~/somefolder/ whose filenames are NOT started with tn_ to 50% of its original size and rename the output file with a tn_ as its prefix and its original name. I know ...
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1answer
238 views

Reading the contents of an ELF file (programmatically) [closed]

I am trying to retrieve the contents of an additional section within an ELF binary. At this point, I'm using the following code to retrieve the name of each section: #include <stdio.h> #include ...
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1answer
66 views

Find which file contain a particular keyword using `grep`

Suppose I know I have to change myhostname = abc.domain.lcl to myhostname = abc.domain.glbl directive but I don't know in which file exactly the directive myhostname is in (i.e., say I have never ...
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1answer
91 views

batch-rename all config file endings to conform to apache 2.4

since apache 2.4 all files in /etc/apache2/sites-available and sites-enabled have to be named with the ending .conf Now on my server I have a lot of these files, renaming the files in sites-available ...
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3answers
119 views

Remove old directories according to directory's name?

In my bash script I create a directory each month for backups as follows: DAY=$(date -d "$D" '+%d') MONTH=$(date -d "$D" '+%m') YEAR=$(date -d "$D" '+%Y') mkdir -p /var/app/backup/$DAY$MONTH$YEAR ...
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1answer
670 views

How to compare directories with binary files

I'd like to compare directories with binary files. Actually, I'm not interested in what the actual differences between files are, but to know if there's a differ (and what files differ). Previously I ...
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1answer
116 views

Incrementing/decrementing a number in a file from a ( zsh ) script

From a script ( running multiple times simultaneously ), I would like create a file something like: echo "0" > /tmp/count Then I would like to do three functions. incr /tmp/count decr ...
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3answers
1k views

Constantly check if file is modified bash

I have a file called file1 I want in a script, whenever there is a change in it, do something, a beep sound actually. How do I do that ¿? Thank you in advance
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3answers
76 views

Can a file ( such as PNG image ) wear out if transferred via SSH ( scp ) 1000s of times back and forth?

The question is about anything really. But in my case it is PNG images. Can they wear out if transferred in-between servers over and over again? I send them to another server and then retrieve ...
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1answer
88 views

Linux does not see a file until I ls on that directory

I have a really weird problem. I have a php script that runs, submits a child process to run, and waits until its done by checking for a OUTFILE.end file to appear. The problem is the file appears, ...
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1answer
262 views

Does “freshening” a zip file with the -FS option change the modification time of the file?

I have a zip file that I use as a backup for my work. I use the "freshen" option (-FS) whenever I want to update my backup file. However, the file shows the date of last modification as being the ...
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1answer
61 views

With mv, possible to put a time dependence on files mv'ed?

Let's say there's a specific time and date I have in mind. All files last edited before this date I want to keep in the directory but all files that have been edited since this date I want to mv ...
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1answer
548 views

grep file from file

What is the fastest way to grep -v a file against another one, both line by line. does grep support this ? Or should I use it on two for loops ?
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1answer
239 views

File has bytes - appears to be empty

I'm having the following problem: Some text files (also some binary files) on my system are listed with the correct file size but when I open them, they appear empty. >ls -la -rw-rw-r-- 1 user ...
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1answer
154 views

List files, directories and executables in current directory

I have php shell and I have function that do just that (but it give me error when I call scandir($path) function because of restriction in php), so I need to use my bash shell to do the same. It can ...
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1answer
44 views

Rotating a file

I have an application which write to a file. Before I run the application, I would like to rotate the file. In others move file.n to file.n+1 file to file.1. I can write a script to do this, but I ...
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2answers
1k 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() ...
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3answers
2k 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 ...
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3answers
112 views

How to rename files and directory with *.~1~ suffix to original name?

I have a directory named underscore.~1~ and several files inside with names like main.js.~1~, index.js.~1~ etc. How can I rename the directory underscore and the files inside to the original names ...
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1answer
3k views

Run .sh file instead of opening it

I am using Zorin OS 7. I want to run a .sh file but I can't seem to be able to—it just opens in a text editor. Also under RMB>open with there is no other option.
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5answers
155 views

how to merge different files that have the same header but slightly different file name?

I have a problem in merging files for a big data sets like below. I want you help me to let me know the script that can do such task. fine name: fluxes_year_lat_long I have 30 years of daily fluxes ...
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2answers
350 views

MacOsx - Shell - list all .php files and their octal permissions, inside a specifc folder

is it possible to list all the ".php" files located into a direcotry and their octal permissions? I would like to list them like this: 775 /folder/file.php 644 /folder/asd/file2.php etc...
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2answers
159 views

Merge a number of text files into one with next line for every file

I have 2 files. I want to merge them. File1 contents: abc File2 contents: def Combined File should be: abc def
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1answer
1k views

Outputting last modification date to another file?

I'm trying to read the number of lines in a file, and the last modification date of that file (e.g. if it was last modified Jan 18, 2013, it should output 2013-01-18), then append the data to the ...
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1answer
132 views

Unsure about the behaviour of my script when writing to log file

I have a very simple ksh script and at certain points I want to write to a log file. I use the following commands in two places... print "Directory listing 1:\n" > ${LogFile} ll >> ...
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1answer
453 views

Group permissions ineffective, permission still denied

I've got a problem with UNIX permissions : I'm working under Debian Squeeze, and one of my scripts, run by www-data, needs to move a file, 23550.zip, placed in the home directory of another user, ...
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1answer
83 views

Does a return from a shell command guarantee that output files have been written?

I'm building an OSX app and use the screencapture command to grab a screenshot and write it to disk: screencapture -mT0 ~/screenshot.png Can I, if I'm not running a UNIX commands in the background, ...
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1answer
189 views

What does - mean with association to Linux files and directories [duplicate]

Possible Duplicate: What does “--” (double-dash) mean? What does '--' (two dashes) mean with association to Linux files and directories. I've found something else but not too sure if it is ...
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1answer
1k views

How to move files with same name and concatenate

My directory structure is given below. I need to move all the folders from Test3 to Test2 and concatenate the files with same names [jg@hpc Test2]$ tree . |-- Sample_1008 | |-- ...
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1answer
437 views

Bit-shifting a file

I wonder if there is an utility to read and print a (binary) file, shifted by some amount of bits (i mean, it should accept amounts, which are not divisible by 8). .. something like dd (and its skip ...
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1answer
203 views

Magic file that redirects to standard output

Is there a magic file name that gives the following effect? $ mkfifo /tmp/fifo1 && cat /tmp/fifo1 & $ foo --log-file /tmp/fifo # now I can see the log as the program runs I want ...
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3answers
4k views

Opening files from Ubuntu server over ssh from Mac Terminal

So I SSH into a Ubuntu server and try to open the file in a Mac program (Coda) and get an error: Couldn't get a file descriptor referring to the console Using the command open myfile.html This ...
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2answers
504 views

Network file sharing with freebsd server

I have a freebsd server at home. I also have other OSes like linux and windows connected to the same network via WLAN (wifi). I want to be able to share stuff (what ever I download ;)) on my FreeBSD ...
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1answer
703 views

Permissions for making some some (but not all) files visible directly under a directory

On wikipedia I read the following: The read permission, which grants the ability to read a file. When set for a directory, this permission grants the ability to read the names of files in the ...
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3answers
163 views

Tool to remove all non-package files on a system

If you want to keep for example a build or server system clean, it is very useful to be able to check that all files are present and accounted for by the package metadata. At work we have a very nice ...
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3answers
51 views

Is it possible to create dynamic content on file read operation?

Is it possible to generate file content based on file name? I need a lot of similar .conf files with content depending on file name only. Can I create some "dynamic" file and generate a bunch of ...
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2answers
35 views

Read the file from one Unix server to the other Unix server

I have a Pro*C program which I run on Unix server a but the input file required for this program is on other Unix server b. Whenever I run I have to copy the file from server b to a. Is there any way ...
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1answer
76 views

ext4 disk space not reclaimed after deleting files

I recently got a "device full" warning for a 2 Tb external ext4 drive. I deleted a bunch of files, about 90-100 Gb of old system backups, and since I did not want to empty all trash, I deleted the ...
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1answer
65 views

Sticky bit and users with sudo permission

Let's say I chmod 1777 a folder /opt/test and all files inside it as user user1. Hence user2 is able to update and edit files inside the /opt/test directory. When user2 operates via sudo, he's able ...
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2answers
132 views

Delete files older than X days +

I have found the command to delete files older than 5 days in a folder find /path/to/files* -mtime +5 -exec rm {} \; But how do I also do this for subdirectories in that folder?
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1answer
38 views

Recursively list files containing an underscore in the file name

I have a large directory with tons of files and subdirectories in it. Is there a way to recursively search through all of these files and subdirectories and print out a list of all files containing an ...