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Internal and enviroment variables

Open the user's preferred text editor

"$EDITOR" "$file"

# NOTE: This variable may be empty, set a fallback value.
"${EDITOR:-vi}" "$file"

Get the current working directory

This is an alternative to the pwd built-in.

"$PWD"

Get the PID of the current shell

"$"

Get the current shell options

"$-"