How to fill in a template in Bash?

How to fill in a template in Bash?

I have looked for this elsewhere but not able to find something that matches my requirements. I need to script in such a way that populates the following fields $1,$2,$3,$4 with the input that I give it and then outputs to a new file thus allowing to run it using the blank template.

How to set variables in the environment in Bash?

Read .env file. All variables will be exported into current environment. Disable exporting of all declared variables in the sources script to the environment. Read the contents of the temp file. Every line would have declare -x VAR=”val” that would export each of the variables into environment.

How to build configuration files from templates with Bash?

I have some templates of Apache and PHP configuration files. Bash script needs to read templates, make variable substitution and output parsed templates into some folder. What is the best way to do that?

Can a template be run as root in Bash?

If you have full control over the templates themselves of course: This method should be used with care, of course, since eval can execute arbitrary code. Running this as root is pretty much out of the question. Quotes in the template need to be escaped, otherwise they will be eaten by eval.

What should be the first line of a bash script?

The template should follow standard Bash programming practices. A basic Bash script has three sections. Bash has no way to delineate sections, but the boundaries between the sections are implicit. All scripts must begin with the shebang ( #! ), and this must be the first line in any Bash program.

Are there any enhancements to menu complete in Bash?

Enhanced completion : Extend completion by syntax-aware completion, completion with quotes and parameter expansions in prefix texts, ambiguous candidate generation, etc. Also, menu-complete supports selection of candidates in menu (candidate list) by cursor keys, TAB and S-TAB .