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Can I refresh my shell within a shell script?

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http://unix.stackexchange.com – Very new to Bash scripting... I am trying to setup a script that starts with a minimal CentOS 6 install and provisions it for Ruby development. #!/bin/bash # Add PostgreSQL Repo rpm -i http://yum.postgresql.org/9.1/redhat/rhel-6-x86_64/pgdg-redhat91-9.1-5.n... # Add NginX Repo echo '[nginx]' > /etc/yum.repos.d/nginx.repo echo 'name=nginx repo' >> /etc/yum.repos.d/nginx.repo echo 'baseurl=http://nginx.org/packages/centos/6/$basearch/' >> /etc/yum.repos.d/nginx.repo echo 'gpgcheck=0' >> /etc/yum.repos.d/nginx.repo echo 'enabled=1' >> /etc/yum.repos.d/nginx.re (HowTos)