[Gllug] Quoting within sed

[Robert Boulter]

Hi,
  I am trying to isssue a sed command to globally alter the directory 
structure within a shell script.
  I have tried all manner of combinations but cannot get round the forward 
quotes on sed i.e.

  $ sed s/usr/usr/cnh/g filename
  $ message garbled

Here i am trying to change the directory usr to usr/cnh.  However single or 
double quotes or backslash  does not seem to remove the special meaning the 
forward slash between usr/cnh has for sed,
  i.e
  usr'/'cnh
  usr"/"cnh
  usr\/cnh

  does not work.  Any suggestions from a struggling beginner would be 
welcome.
Regards Rob.

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