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

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4
votes
2answers
822 views

What does this zsh solution to “the argument list is too long” do?

I read in this answer from @Gilles the following: In zsh, you can load the mv builtin: setopt extended_glob zmodload -Fm zsh/files b:zf_\* mv -- ^*.(jpg|png|bmp) targetdir/ as a solution to ...
1
vote
2answers
64 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 ...
1
vote
4answers
56 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?
1
vote
2answers
94 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 => ...
1
vote
0answers
29 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
32 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 ...
5
votes
2answers
182 views

How to gather byte occurance statistics in binary file?

I'd like to know the equivalent of cat inputfile | sed 's/\(.\)/\1\n/g' | sort | uniq -c presented in ...
-1
votes
1answer
22 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.
0
votes
1answer
37 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
19 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 ...
2
votes
2answers
60 views

How can I shuffle pages from a pdf file in a random order?

I would like to shuffle the pages of a pdf document in a random order. How can this be done?
2
votes
1answer
26 views

How to guard a set of folders from being written into by a specific process?

I would like to have a way in which a set of folders do not allow write access for a particular process. For example, I would love to have a way in which YUM/RPM is not allowed to write into /usr/bin ...
55
votes
4answers
15k views

What's the point in adding a new line to the end of a file?

Some compilers (especially C or C++ ones) give you warnings about: No new line at end of file I thought this would be a C-programmers-only problem, but github displays a message in the commit view: ...
1
vote
2answers
51 views

shell or perl script to check group have read privileges

ls -l drwx------ 8 ws web 1024 Apr 29 2013 abc drwxr-xr-x 8 ws web 1024 Oct 19 2011 def I need some script to find directories like abc which doesn't have read/execute permissions ...
1
vote
0answers
16 views

Allow move but not put in internal-sftp

is it possible with the internal-sftp to allow mv command from dir A to B but not allow put to A?
4
votes
2answers
327 views

Where is the trash can for root partition?

I use trash-put to trash files from command line. Recently, I had aliased my rm command to trash-put so that I don't accidentally delete something important. However, what happened now was that I ...
2
votes
2answers
56 views

is it possible to search for files that have a special Linux file attribute?

is it possible to search file in the linux OS that have particular file attribute as this: ---S--l--- ---S--l--- 1 root root 0 Mar 1004:25/opt/csTuner/iba/wys/tuer_lolk What is S in ...
4
votes
1answer
32 views

Why can't another user access my file when it's a full path?

I have a program that runs a command that is something like this: /home/myuser/bin>> /usr/bin/sudo -u otheruser script.py /home/otheruser/file.txt This works, but now I need this to work when ...
2
votes
2answers
40 views

One-liner to sort and uniq two outputs

I'm currently doing this to sort and uniq the output of two different commands: tshark -r sample.pcap -T fields -e eth.src -e ip.src > hello tshark -r sample.pcap -T fields -e eth.dst -e ip.dst ...
46
votes
7answers
4k views

How are file types known if not from file suffix?

I would like to know how file types are known if filenames don't have suffixes. For example, a file named myfile could be binary or text to start with, how does the system know if the file is binary ...
3
votes
1answer
115 views

How do you deliberately trigger a “text file busy” error?

Very occasionally I encounter "text file busy" error while using my Linux 4.0.4 computer. I read that when the error happens, kernel is preventing modification to a file that is being "used". So I ...
1
vote
1answer
78 views

get original creation date of html file

Can I find the creation/last modified date of an html file? For example, I would like to know when some index.html file from some website was created, not when I downloaded it.
0
votes
1answer
50 views

How to create a bash script that sees all files in a directory and tells me their size and date of creation?

I'm a beginner in the field of programing/coding. I'm trying to write a simple bash script that will see all files in a directory, and then tell me each file's size and each of their dates of ...
3
votes
0answers
14 views

Is posix_fadvice / POSIX_FADV_DONTNEED functional in Linux?

If I am doing once only scanning across big files then do I need to worry about impact on the page cache or does the OS take care to avoid my scan causing pointless churn in the page cache. I want to ...
0
votes
0answers
33 views

Archlinux: Gnome 3.16 - ls & nautilus incorrect sorting

Recently switched from Xfce 4.12 DE to Gnome 3.16 and I have a problem with dirs & files sorting in terminal and nautilus. Test directories (how it should be): [ Pqr ] Abc Klm My current order ...
1
vote
1answer
163 views

Permission denied writing to mysql log

I am just testing out a new Ubuntu (Vivid 15.04) install on Vagrant, and getting problems with mysql and logging to a custom location. In /var/log/syslog I get /usr/bin/mysqld_safe: cannot create ...
3
votes
3answers
35 views

Create 2 similar-name files with content from 2-line output of a command

I perform cmd and it outputs 2 lines of text: $ cmd foo bar I need to write these to: `/long/path/x.{load,conf} Writing to this destination requires superuser privilege, which rules out manually ...
1
vote
1answer
45 views

How to see if a file has CAP_NET_ADMIN?

I ran the following command: sudo setcap cap_net_raw,cap_net_admin,cap_net_bind_service+eip `which nmap` Now I'd like to add to my ~/.zshrc a line that detects such settings and exports ...
1
vote
1answer
26 views

What do you call the supervisord and php-fpm et. al. config format?

Both php-fpm and supervisord use a config format that looks like this: [category] settings = value some_other_setting = value Is there a name for this format?
2
votes
3answers
46 views

Move file and preserve owner and mode in one atomic operation

Is there a way to move a file and preserve original owner(group) and file mode in one atomic operation? So there will not be change for others to access moved file in time when is not already set ...
4
votes
3answers
93 views

Find largest files from each date in a directory

I have a directory similar to the following: -rw-r--r-- 1 root root 223K Apr 28 14:25 2015.04.28_14.25 -rw-r--r-- 1 root root 253K Apr 28 14:55 2015.04.28_14.55 -rw-r--r-- 1 root root 276K Apr 28 ...
1
vote
2answers
157 views

How to see if the directory exists?

How can I check if /bin/x86_64/bin/ls is a directory in a bash shell script Here is what I tried: #!/bin/bash if [ $# -eq 2 ]; then if [[ "$1" = /* ]] then cd ./bin/x86_64/bin/ls ...
10
votes
3answers
35k views

undelete a just deleted file on ext4 with extundelete

Is there a simple option on extundelete how I can try to undelete a file called /var/tmp/test.iso that I just deleded? (it is not so important that I would start to remount the drive read-only or ...
1
vote
3answers
64 views

How to scp all files of a certain owner?

I want to scp all files of certain owners. For example, if this is my ls -la output: -rw-rw-r-- 1 owner1 ad 704 Jun 1 18:16 file1 -rw-rw-r-- 1 owner2 ad 798 May 29 11:15 file2 -rw-rw-r-- 1 ...
5
votes
6answers
117 views

How to find out whether two directories point to the same location

Do the following paths point to the same disk location? /home/username /app/home/username
2
votes
1answer
56 views

How to monitor the opening and closing of files?

I'm writing an AI personal assistant. One part of the software is a monitor daemon. A small process that monitor's user's active windows. I'm using python( with libwnck and psutils for obtaining info ...
0
votes
1answer
63 views

Remove files newer than X day and hour

I want to remove files, more specifically, symbolic links of /usr/include that are newer than 2 JUN 22:27 How can I do this?
3
votes
2answers
168 views

change file size format when using stat

The formatting character %s makes stat print the filesize in bytes # stat -c'%A %h %U %G %s %n' /bin/foo -rw-r--r-- 1 root root 45112 /bin/foo ls can be configured to print the byte size number ...
7
votes
2answers
6k views

How to circumvent “Too many open files” in debian

If I want to see all relevant log files of my apache2 server at once, I use tail -f /var/kunden/logs/*log /var/kunden/logs/*log /var/log/apache2/*log |grep -v robots|grep -v favicon But since those ...
4
votes
4answers
392 views

How can I get the size of stdin?

I'm about to compress a large directory and I want to know how large, exactly, the resulting file will be. I've tried using du: $ tar -cv dir | du -h - du: cannot access '-': No such file or ...
2
votes
2answers
47 views

Selecting a random sample from a directory tree

I've got a directory that contains directories that contain directories that contain files. I'd like to select two files at random from each leaf directory. I found this question about selecting ...
2
votes
1answer
71 views

Batch Extract & Repack .RAR Files

I'm dealing with a large amount of password protected .rar files which need to be repacked to remove the password. (The password is known.) I was wondering if there was a script to batch/recursively ...
11
votes
3answers
6k views

Can files be created with permissions set on the command line?

When creating directories, mkdir -m <mode> <dir> provides for creating one or more directories with the given mode/permissions set (atomically). Is there an equivalent for creating files, ...
1
vote
3answers
99 views

Script to move one filetype and create a subfolder, if it exists?

I'm trying to find a script that would basically look recusively at a directory, and if the script finds file that are .flac files, it will create a subfolder called FLAC in that same folder, and move ...
3
votes
2answers
56 views

Use USB to synchronize large directory between two disconnected servers

I'd like to synchronize a large directory between two disconnected servers with a USB device that's too small to hold the entire directory. Each server has a majority of the data and the changed files ...
3
votes
3answers
75 views

Copying a Parent Directory into a Subdirectory Without an Infinite Loop

For application specific reasons, I need to copy an entire parent directory into a subdirectory. E.g., cp -r ../ tmp/ The problem with this is that it gets stuck in an infinite loop, recursively ...
30
votes
4answers
14k views

Clone ownership and permissions from another file?

Is there a command or flag to clone the user/group ownership and permissions on a file from another file? To make the perms and ownership exactly "like" that of another file?
1
vote
0answers
27 views

Is there any considerations I should take when running untrusted apps as non-root user?

I have to use an application I don't trust (unstable) and I will run it as a non-privileged user so if something bad happens the damage would be limited to the home folder of that user. I removed ...
2
votes
1answer
76 views

NFS permission problem with secondary groups

I have a server running Debian 7 that exports an NFSv3 share, and a client running Centos 5 that accesses it. This works fine, except for one issue with permissions based on non-primary groups. When ...
2
votes
1answer
72 views

Get all filenames in a directory created before input date

I have a directory containing lots of files. The output of ls command is -rw-r--r-- 1 nobody nogroup 427494 May 26 13:59 14_20150526065238928590_102.txt -rw-r--r-- 1 nobody nogroup 2113592 May ...