PATH variable

• Tells the system where to look for executable files
• PATH variables are found in,

  /bin - Core system binaries, works when no-user directory is mounted
  /usr/bin - Cross user binaries managed by pacakage manager
  /usr/local/bin - Cross user binaries managed by users
  

• Can be set by,

  export PATH="/usr/local/bin:/usr/bin:/bin" 

• Lookup precedence is customisable