grep question

[Johann Spies <jspies@sun.ac.za>]

In the grep's info page I find the following which works as said.  But
I want to know why.  What does the [c] do in this case?

------------------------
  7. Why do people use strange regular expressions on `ps' output?

          ps -ef | grep '[c]ron'

     If the pattern had been written without the square brackets, it
     would have matched not only the `ps' output line for `cron', but
     also the `ps' output line for `grep'.

-------------------------------

Johann
-- 
Johann Spies          Telefoon: 021-808 4036
Informasietegnologie, Universiteit van Stellenbosch

     "Do not be anxious about anything, but in everything,  
      by prayer and supplication, with thanksgiving, present
      your requests to God. And the peace of God, which  
      transcends all understanding, will guard your hearts  
      and your minds in Christ Jesus."   Philippians 4:6,7  


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