linux - Half of a mkdir function works but cd part doesn't

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65892984/half-of-a-mkdir-function-works-but-cd-part-doesnt

Answer 1

When working in / with bash There is no need to cd (it's actually considered "poor form"). cd is "meant" for command line usage -- Though it will work in some cases programmatically, it's easiest and best practice to use the directory when working with it rather than trying to change directory into it.

Simply "use" the full directory to do whatever you intend on "doing" with it .. IE

mkdir "$1" && echo "test" > $1/test.txt

NOTE

In case I read your question wrong, and you want the shell to change directory is a little trickier. The sub-shell (or bash script) has it's own concept of directory .. So no matter "where" you tell it to cd, it will only apply to that sub-shell and not the main shell (or command line). One way to get around this is to use alias

alias dir="cd $M1"