Questions tagged [unix]
Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs.
3,986
questions
0
votes
1
answer
144
views
Cannot remove a symlink recursive
During a delete of a backup, somehow the rm -rf got stock and couldn't delete a symlink.
Now, my folder looks like that:
$ ls
armips-master # folder
$ cd armips-master
$ ls
armips
$ readlink ./armips
...
1
vote
1
answer
2k
views
How to send and receive an UNIX datagram with socat?
I need to send a UNIX datagram to an open port in a running application with socat. When the application receives the datagram, it will answer back with another.
I need to do this to get the resulting ...
0
votes
1
answer
95
views
Continuous Open-File-Handle Monitoring in Unix
In Unix do you know of a way to do continuous open-file-handle monitoring?
I know of lsof, which has a maximum sampling rate of 1s. However, I'm looking to do the exact same thing except continuously, ...
0
votes
1
answer
21
views
Can anyone assist me with this script?
I'm having trouble with having the following command options -s and -f display what I need them to. The parameters are being recognized fine.
#!/bin/bash
defaultPath="/etc/passwd"
...
0
votes
1
answer
618
views
UNIX or Linux sort: only sort on the first part of an entry
I'm working on a complicated grep, something like grep -E -i "first|next" *.txt, and I get results like:
logs.10.txt:2022-10-07 10:33:05.6673 | ClassName | [Info] | Inside function first(), ...
0
votes
1
answer
45
views
file system permissions for samba share
I have an issue with file system permissions when using samba on my raspi.
It worked previously, then it stopped working. I suspect something with the file system.
It is about the folder /media/usb/...
0
votes
0
answers
129
views
No BIOS boot options
Today out of the blue, I encountered the following problem: whenever I turn on the pc, it goes directly to the BIOS instead of opening GRUB. The problem is that it doesn't show any drive in the boot ...
0
votes
1
answer
31
views
Is it defined to use pax across filesystems?
If I wanted to backup a *nx system, am I correct that going across filesystem boundaries would be a no-no? Would utilities like pax properly handle the jump across them or do I avoid it? If avoid it,...
-1
votes
1
answer
526
views
Getting “scp: Target is not a directory” when trying to upload files from desktop to a remote Unix directory
I’m trying to upload a file from my desktop to directory2/ on my university's Unix server. I tried doing this:
scp /Macintosh HD/Users/myname/Desktop/filename.c [email protected]:/directory1/...
1
vote
0
answers
536
views
How to mount NAS volume via. Terminal /command line without additional prompts on OSX
I remotely manage a Mac Mini at home when I am away. We also have a Synology NAS that I use for various additional storage and backups. Sometimes, if there is WiFi or internet issues, the Mac Mini ...
0
votes
1
answer
114
views
Output to stdout and external txt file
I am trying to redirect the stdout of a particular output to a txt file, however I would still like to view it in the console log
tail -f /var/log/kern.log | ./prsfwlog -f elfs/prs_log.elf | \
grep -E ...
1
vote
0
answers
230
views
Attempts to Zip files by date not working as expected
I am trying to zip up a bunch of files, but only those created on a certain date. I'm trying to use the -t option, but it's not finding the files that I can clearly see are there.
This is a sample of ...
-1
votes
1
answer
591
views
Recover data from broken wd hard disk by replacing the head
I have a broken wd hard disk, see this link for the detail status:
How to use dd to backup "WD My Passport" on Ubuntu
Because it is not allowed to ask more than one question in the same post,...
0
votes
1
answer
134
views
how to make Google Drive put files in old directory (~/Google Drive/) instead of new directory (~/Google Drive/My Drive/)
Background
I am using Google Drive for Desktop on two Mac laptops. Both are running "Catalina" (MacOS 10.15). I would like to be able to sync between them and have the filepaths be the same ...
0
votes
1
answer
363
views
How to use dd to backup "WD My Passport" on Ubuntu
My "WD My Passport" has problem when connecting to Windows 10, it may have hardware error.
I have set a password for the "WD My Passport" with WD Security long time ago.
Windows ...
1
vote
2
answers
2k
views
Cannot boot Qubes after successful installation
There is a problem with booting Qubes 4.1.1 after installation marked by installer as successful. The validity of the image is confirmed and hardware requirements should be passed.
SETUP [docs]
Intel ...
0
votes
2
answers
1k
views
Setting environment variables using eval - by calling other shell script
I have two shell scripts Caller and getGlobalParameters.
There is a function defined in the getGlobalParameters script which calls a java class and uses the values returned by the java class to set ...
0
votes
0
answers
177
views
How to encrypt files so that root cannot view them?
I have a powerful linux server with lots of CPU+RAM which sits around idle 99% of the day.
I have a friend who has some financial models that he runs on his laptop for 2 hours a day.
I want to invite ...
2
votes
0
answers
145
views
are page tables under utilized in x86 systems
I was recently looking at the page table architecture in x86 and x86-32 machines.
x86-32 paging architecture:
x86-64 paging architecture:
In x86 for example, we use 10 bits as offset into the page ...
12
votes
5
answers
10k
views
Why a fork is often followed by an exec?
Why "a fork is often followed by an exec"?
Can't you just create a new process in UNIX?
0
votes
0
answers
459
views
How do you download something using wget and the download URL when the web page requires a checkbox ticking?
I want to download some data. On the web page where the download is, there is a box that needs checking to confirm that the terms have been agreed before allowing this download. When I try to download ...
0
votes
0
answers
80
views
MD5 File Concatenation
dears,
can any one help me on
here is an example md5 file which contains several checksums. (between the dashes)
You will see that 6 are for files in on subdir and 2 are for files in the directory:
---...
0
votes
1
answer
173
views
See htop tree evolve in slow-motion
Using htop and its tree view (trigger by t or F5) one can see processes by parenthood, and layout the relations between them as a tree.
Is there a way to see how the process tree evolves in slow ...
19
votes
1
answer
4k
views
How can I tell when FFMPEG is done writing a file?
Given an input video, input.mp4, the following command produces an out folder containing a bunch of HLS video segments and m3u8 playlist files for a number of resolutions:
ffmpeg -hide_banner -y -i ...
0
votes
1
answer
640
views
Cannot Connect VNC through SSH to Windows from Unix
I mostly have Unix devices and use VNC through SSH to connect to all of them. However I have one Windows 10 PC and I cannot remote into it.
On the Windows 10 PC, I installed TightVNC Server (Version ...
0
votes
3
answers
5k
views
Unix: How to Exit Out of "/" directory?
I am learning some elements of the Unix environment myself. I have tried to search up this question but perhaps I am not wording it correctly. It is quite possibly a very trivial question, too, but I ...
0
votes
0
answers
120
views
How to change permissions for a file in Ubuntu?
I run the file ./schema.pg.sh with the command sudo ./schema.pg.sh in /sql directory. But the terminal throws an error:
could not change directory to "/sql": Permission denied
Script I am ...
0
votes
1
answer
47
views
Sorting the list of subnets as Integers ascending
I have a list of subnets for eg.
180.151.96.0/22
180.151.240.0/21
119.82.112.0/22
203.122.29.0/24
203.122.48.0/22
119.82.92.0/24
180.151.108.0/23
119.82.124.0/24
119.82.89.0/24
180.151.17.0/24
119.82....
9
votes
1
answer
13k
views
Troubleshooting "Connection closed by authenticating user andy 173.63.60.32 port 11706 [preauth]"
As noted in the title, I am having trouble connecting to a remote server through ssh.
I am trying to connect a Windows machine to a server running CentOS. I have been using PuTTY on the Windows ...
1
vote
1
answer
229
views
zsh alias for running the most recent matching history item
I'd like to create an alias in zsh that runs my last terminal command beginning with node. I can run that command with !?node, but I can't create an alias with alias N='!?node'. How can I make this ...
0
votes
2
answers
288
views
Accidentally made an alias for a pre-existing command on OS X
I was toying around with aliases and made an alias to take me to the directory where I store all my bash projects via the cd command.
However, I used 'bash' as a name for the alias. Now when I run all ...
0
votes
1
answer
720
views
Inodes in External Disk full. Actually not
Checking inode usage:
[cold] > df -ih .
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sdb1 59M 59M 7.9K 100% /home/doom/cold
Here we see 100% Inode usage. 59 million inodes ...
0
votes
1
answer
407
views
How to do a recursive filename `find` from the shell using a glob pattern with "set braces"
From the shell, I'd like to recursively search a directory for a given glob pattern. But I want to use set-braces-syntax in my pattern:
find ~/path/to/dir -name '*.{h,m}'
Here I'd like to recursively ...
0
votes
1
answer
1k
views
How to remove everything between quotation marks in Unix
How do I remove everything between and including single quotes in Unix/Linux?
Example:
Input : WHERE EnodeB_Fin Date_Time_Fin >= '2022-03-15 00:00:00'
Output : WHERE EnodeB_Fin Date_Time_Fin &...
0
votes
0
answers
204
views
How to recover a corrupt G.726 audio file?
I have an old audio file in g726 format, which I last opened three computers ago. It appears to be corrupt -- ffmpeg rejects it with Invalid data found when processing input...
It is not all zeros, so ...
0
votes
1
answer
739
views
unix, vi editor, copy and paste, not pasting first lines
I am performing the below steps.
Looks like I am not able to copy and paste into vi editor on unix with #!/bin/ksh as the first line. I pasted the code I need in but I do not see that in first line in ...
0
votes
1
answer
2k
views
simple bash script for collecting logs
I'm new with BASH scripting and I need a little help if it's possible.
Let's say there's a UNIX server from which I want to gather some simple log events (let's say .txt files). Let's say log events ...
2
votes
1
answer
203
views
Does the slave pseudoterminal use the line discipline?
According to this article:
the line discipline instance is not evoked when the TTY driver is sending user program output to PTY master
and the accompanying diagram.
However, according to a different ...
0
votes
1
answer
174
views
Removing Duplicate from File
I have two files fileA and fileb
FILEA
1.1.1.1
2.2.2.2
3.3.3.3
4.4.4.4
5.5.5.5
FILEB
4.4.4.4
2.2.2.2
Output should be
1.1.1.1
3.3.3.3
5.5.5.5
Size of File A is around 60GB and Size of File B is 1GB
...
0
votes
1
answer
187
views
Why can't I ping db from a unix machine on windows?
I have a windows machine, with ubuntu on it, where I run docker, in which there is a container I need to connect to db. But the problem is already between windows and ubuntu.
If I ping the db from ...
1
vote
3
answers
3k
views
UNIX/Linux: What's the file permission number?
When I ask for file permissions on a Windows-10 WSL Ubuntu app, I do:
ls -ltra
And I get information like:
-rwxrwxrwx 1 scampsd scampsd 42034 Mar 29 15:26 Filename.cs
drwxrwxrwx 1 scampsd scampsd ...
1
vote
1
answer
1k
views
IntelliJ quits abruptly in the Apple M1
I use Apple M1 and IntelIJ keeps shut down often when I login into the computer in the morning and I need to restart the app. Also, sometimes the IntelliJ just freezes and I need to force quit to ...
0
votes
0
answers
108
views
Execute a program with a sequential list of files
I have a list of files with titles like the following:
file_0.10_180.0degrees.txt
file_0.15_180.0degrees.txt
file_0.20_180.0degrees.txt
file_0.25_180.0degrees.txt
where the files can be passed in as ...
0
votes
1
answer
358
views
How to compress the main folder which includes certain sub folder using tar
Assume we have a folder structure as below
main_folder
- sub_folder1
- sub_folder2
- sub_folder3
- valid_folder1
- valid_folder2
- junk_folder1
- junk_folder2
...
0
votes
1
answer
365
views
Equivalent of /dev/full on OSX
I want some special file which throws an error when I write to it. /dev/full does that on Linux. I don't care too much about the specific error.
4
votes
3
answers
4k
views
BeyondCompare doesn't ignore difference in line endings (DOS/UNIX)
I am using BeyondCompare 4 on Windows 10 to compare two directories with thousands of files.
They are the basically same, but one exported from Windows, and another one from Linux. The only difference ...
1
vote
1
answer
2k
views
How to forward a remote UNIX_AF socket to a local port with ssh
I'm trying to forward a remote UNIX_AF socket to a local port through ssh, but it fails with the message:
Warning: remote port forwarding failed for listen path /path/to/sock
I tried to run ssh user@...
0
votes
1
answer
1k
views
Change the ownership of all files & folders based on search result
I know how to find all the files & folders owned by a specific user, say tommy:
find / -user tommy
But how can I chown the files & folders to another user, say peter?
I know I can change ...
1
vote
1
answer
178
views
Where is my PATH?
When I run the following command, I see several paths and all looks well.
echo $PATH
However, I want to find out where these paths are stored.
I have looked for ~/.bash_profile and ~/.zshrc but they ...
1
vote
2
answers
3k
views
Postgresql unix domain socket with password authentication
It looks like postgresql supports either of the below
Use tcp (i.e. localhost:5432) with password authentication
Use Unix domain scoket (i.e /var/run/postgresql/.s.PGSQL.5432 ) with peer/trust ...