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Here is a nice introduction to shell. It explains what they are, what differentiates them from the command line, and the different varieties of shell available.
Here is where I write a nice introduction about the Bourne again shell.
Here is my page to the wiki page for bash –> bash
Here is where I take a stab at explaining what ZSH is, and why zsh differs from bash.
Here is my page on zsh –> zsh
This section is to cover neat tricks that are too cool to be tucked away in a section of their own.
cat <<EOF> $FILE
> #!/usr/bin/env bash
> echo "Do something really cool!"
> EOF
Recently a few new commands have been encountered, that have never been seen before. Unsure if they are new arrivals or if they are older commands which were unknown of. Either way, they listed below.
Newgroup allows a user to initiate and finalize changes to group membership without having to log out and in again. This feature becomes handy when the user does not need to lose any established environment variables.
Pushd comes from perl, and appears to be part of the standard perl package. The best way to describe the functionality of pushd is to think of it as a temporary change directory command. As it allows the user to designate a directory to change into, and when ready, executing the command again without any arguements then will return the user back to the directory he started out in.