Category "bash"

define environment variable in databricks init script

I want to define an environment variable in Databricks init script and then read it in Pyspark notebook. I wrote this: dbutils.fs.put("/databricks/scripts/i

Convert mp3 -> Video with static image ( ffmpeg/libav & BASH )

Some years ago I used the following bash script to get a video out of mp3's and one image (so the image in the video was freezed over the length of the mp3), wh

Linux flock, how to "just" lock a file?

In Bash, I'm trying to make a function getLock to be used with different lock names. function getLock { getLock_FILE="${1}" getLock_OP="${2}" case

Trying to loop through lines on stdin

I would like to make a short script that will eventually run a quiz. I'm trying to read stdin, which contains a new-line delimited list of words, for example: v

C# execute a terminal command in linux

I want my c# application (which I execute on a raspberry pi) to run a bash script whenever it starts.. basically : the script is located in /etc/init.d and is n

Multiplying strings in bash script

I know that if I do print ("f" + 2 * "o") in python the output will be foo. But how do I do the same thing in a bash script?

Why does Bash trap not capture the exit status for an undefined variable?

I need to capture error conditions in a Bash script using a trap. For this reason I've both set -e AND set -u in my script. However I've noticed that the trap

Update a PostgreSQL field from the content of a file

I have a file containing a value which should go into a field of a PostgreSQL table. By searching a little, I found many answers, e.g. How can I update column v

Shell script not running via crontab, but runs fine manually

I have a script that checks if the PPTP VPN is running, and if not it reconnects the PPTP VPN. When I run the script manually it executes fine, but when I make

How to replace "00" in data with "N/A" skipping first row in sed?

I'm working with GWAS data, My data looks like this: IID,kgp11004425,rs11274005,kgp183005,rs746410036,kgp7979600 1,00,AG,GT,AK,00 32,AG,GG,AA,00,AT 300,TT,AA,00

Docker compose create kafka topics

Problem: Cannot create topics from docker-compose. I need to create kafka topics before I run a system under test. Planning to use it as a part of the pipeline,

Issue with activating virtualenv

I installed python environment by means of commands: SYS_INSTALL="apt-get install -y" PIP_INSTALL="pip install" # Be sure to install setuptools before pip to

How to Add Two Columns of DataFrame and Rename it with Prefix Name using bash

The original Data looks like ID,kgp11274425_A,kgp11274425_HET,kgp5732633_C,kgp5732633_HET,rs707_G,rs707_HET,kgp75_T,kgp75_HET 1,C,T,G,T,C,A,0,0 2,C,C,T,G,A,A,G

How to run functions and local resources over SSH in a shell script

I have a shell script file like this: #!/bin/bash CONF_FILE="/tmp/settings.conf" #settings.conf contains OS_NAME="Caine Linux" source $CONF_FILE display_os_n

Get exit status of a process in bash

I have a c++ executable named Test. I want to find out the GetExitCodeProcess() code when the execution is completed. I can find out the status code by writin

How can I set Bash aliases for docker containers in Dockerfile?

I am new to Docker. I found that we can set environment variables using the ENV instruction in the Dockerfile. But how does one set Bash aliases for long comman

Azure + Terraform + Grabbing a variable and passing it along

Hopefully someone can push me in the right direction. I have a Terraform plan that currently stands up a Linux VM in Azure. I am attempting to run a bash script

VS Code - wsl server closed unexpectedly

yesterday my laptop run out of battery it was late night and decided to not turn it on back. In the morning I ran into this issue Could you help me please. Can'

How to build a standalone C ELF binary without installing libraries on a remote machine?

I am trying to build a C ELF binary on linux and try to execute it directly on another machine. (Sent via scp linux command) The problem is that even when I bui

How can I check the first character in a string in Bash or Unix shell?

I'm writing a script in Unix where I have to check whether the first character in a string is "/" and if it is, branch. For example, I have a string: /some/dire