Hardware Reference
In-Depth Information
<
The < operator is similar to the > operator, except that it reads the contents of a file
and feeds it to a program. This can be used in a lot of ways and is in some ways
similar to using < .
Using the < operator to send the contents of dir.txt to the more application
Environmental variables
Another powerful feature of bash is the use of environmental variables.
Environmental variables are values that are stored in memory and can be used to
temporarily store information and settings. One example of this is the PATH variable.
The PATH variable tells bash where to look for any programs if they aren't in the
current directory.
All the current environmental variables set can be displayed using the printenv
command. They are loaded into memory automatically when your Raspberry Pi
boots up.
Some of the environmental variables set up by default in Raspbian
 
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