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basic

  • Determine where a binary command is stored / located on file system

    • whereis command example
      Display ls command location along with man page path:

        lcpeng@ubuntu:~$ whereis php
  php: /usr/bin/php /usr/local/php5.6 /usr/local/php

    • type command example
      Find out which command the shell executes:

        lcpeng@ubuntu:~$ type -a php
  php is /usr/bin/php
  lcpeng@ubuntu:~$ 
  lcpeng@ubuntu:~$ type -a php5
  php5 is /usr/bin/php5