Write userShell configuration

Closed Ghost User requested to merge (removed):fhdk-set-shell-cli into master

The code writes the the userShell if one is defined in profile.conf

documentation to go with profile.conf in install section

# default system shell is bash
# use /etc/defaults/useradd by supplying a space " "
# use the full path e.g. "/bin/zsh"
#user_shell=" "
Edited by Ghost User

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