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Category shell script

Ansible shell execution: no environment variable are loaded

When you execute shell script with ansible module, bash is invoked as a non-interactive login shell. Consequently, environment variables from the user are not loaded. If you execute man bash, you’ll see: The solution is juste to explicitly load… Continue Reading →

Do not trust chatGPT answers

Just be careful, chatGPT is a black box, you don’t know how it resolves your question. Furthermore on a question when you lack some knowledge, your no able to evaluate the quality of the answer. For instance, I’ve just knock… Continue Reading →

Tomcat start with ansible doesn’t work, tomcat starts but process doesn’t stay active

It happens because when ansible close it’s ssh connection, and when the ssh connection is closed the kernel sends SIGHUP to the controlling process of the ssh connection. But when execution, the java process will receive the SIGHUP and… Continue Reading →

How manage background tasks in your CLI and in your shell script application

First: do you know how to run background task not attached to your user session? Running a task attached to your current user session Imagine you establish an ssh connection to your linux host, or you just log into your… Continue Reading →

Shell script special variables ordered by frequency of used

$n Where n is a positive integer and takes values from 1 to a greater value not restricted. n correspond to the position of an argument givent to a script or to a function $? Exit status of the last… Continue Reading →

Send an email on Linux with CLI or shell script without installing anything (no ssmtp required)

Prerequisites Basic example without encoding headers Case of an existing SMTP server without authentication ( can be replaced by the domain name of your smtp server or its IP address): At the end you can see “\nSubject: TEST send mail… Continue Reading →

Shell script – Variables evaluation : display line endings \n and don’t cut your parameter function

How to pass string with several words and line endings \n as a parameter to a function Solution : Second test rst test : $myvar will be replaced by it’s value that contains a lot of words with spaces and… Continue Reading →

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