Category "shell"

Why does "(echo <Payload> && cat) | nc <link> <port>" creates a persistent connection?

I began with playing ctfs challenges, and I encountered a problem where I needed to send an exploit into a binary and then interact with the spawned shell. I fo

Append lines separated by comma while preserving the existing new line

Bash script used: #!/bin/bash set -xv IS=$'\n' list=$(cat exlist_sample | xargs -n1) for i in $list; do echo "$i" | rev > slist echo "$i" >> z

How to generate date in this format (2022-04-29T06:07:28.158Z) in linux

Looking for solution to generate date in the below format: 2022-04-29T06:07:28.158Z Have to use in bash script.

edit the ID column to add chr to a number

I have a vcf file. It looks like this: It has a vcf header followed by genotype information. I want to add chr to third column. Like now it looks like: 21 98257

how to perform string operation in an input string and get the desired output

I have to write a shell script to accept the product order details as string input and display the total order amount and number of order under each category.

Watch changes in a file and restart python script

I want to restart a python script(restart.py) whenever some edits a file (test.txt) =====restart.py==== from time import sleep for i in range (1000): print

git checkout shell alias not working as expected

I'm using zsh and I added "gc" as an alias for "git checkout" as below in the .zshrc file. alias gc="git checkout " When I execute git checkout dev, it works fi

How to execute script as bash using "at"?

It was a pain to google solutions for my problem since it is using application "at" :) So the thing is, I am trying to run long runnng operation (I know that I

When using python to run adb shell command, how can i kill a running program in adb shell?

For Android device, if i enter adb shell in iTerm and then run some program to continuously output data(like getevent, logcat), i can kill these programs by CTR

Bash - Remove leading zero for numbers with double digits

I have a variable in bash number which contains values 01, 02, 03, 04, 05, 06, 07, 08, 09, 010, 011, 012. I would like to remove the leading zeros before 010,

Trap and exit big shell script with background processes

I have 2 shell scripts that contain ffmpeg commands (command1.sh and command2.sh). command2.sh has like 500 ffmpeg commands that trigger one after another with

How can I generate a 2D matrix of natural numbers wth zero in ascending order in shell script or another programming language?

I need to generate matrices of natural numbers in ascending order with zero (0), but they are very large ones and it will be hard to write them by hand. What I

How to fix "Powershell needs Windows management system 4.0'

I want to know How i install Powershell in my win 10 pc because it dont came installed in it Please help me. I will be very thankful to you

Are shell scripts sensitive to encoding and line endings?

I am making a NW.js app on Mac, and want to run the app in dev mode by double-clicking on an icon. First step, I'm trying to make my shell script work. Using VS

Parsing list in bash

I have a text file which looks like this: ... unique_trigger = item1 item2 item3 ... itemN u

timeout doesn't work with nvm: nvm no such file or directory

I want to set timeout for each instance of node.js running. but when I run the following commands I got the error timeout: failed to run command ‘nvm&rsqu

bash setting variable getting error command not found [duplicate]

I'm writing one small bash script for my Project but i getting some errors #!/bin/bash count=$(cat Downloads/datei.csv | wc -l); for((i=115;i&

different PDB files add hydrogen same time using reduce program in shell script with modified file name (1axk.pdb <---->1ackH.pdb)

I tried to run this code but its repeated the same file and ignored the other files and I want to stored all the directory files into a variable so that, read t

/usr/bin/cat: -: Bad file descriptor when using pipe()

I am recreating a complete shell. For that I must simulate "|". To do this, I have to use the dup2(), fork() and pipe() functions. here is my code : void do_pip

powershell script to select directory

I would like to create a powershell function or cmdlet that would allow me to quickly navigate to files and function like the example below. Could someone enlig