Hands On Exercise - GNU Tools Part 1

Bash:

• Other shells: All of theses examples are done in the bash shell, the most common shell on Linux, but there are many others: ksh, zsh, csh, etc.. Here is a good comparison of shell features.
• Redirection:
  obvious:

  $ echo "hello" > hello.txt

  dial your favorite 976 number on your modem:

  $ echo "ATDT 9767399" > /dev/ttyS0"

• Appending:
  obvious:

  $ echo "world" >> hello.txt