unix - single quotes not working in shell script -

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I have a .bash_profile script and I have the following alias for the following: lsls = 'ls -l | Sort-n +4 '

When I type the nickname of LSL it is in a way but then posts this error message "-bash: +4: command not found" I nickname To '+4'?

This works when Type LS-L |

I am in OS X 10.4

Thanks for any help 

  bash-4.0 $ ls -l | Sort -n +4 Type: Open failure: +4: Any such file or directory

you have ls -l | Sort -n -k 5 , gnu sort is different from BSD sort 

  alias lsls = 'ls -l | Edit-n -k 5 '

Edit: Update based on indexing from 1 based indexing to 1 reflecting changes, thanks to Matthew.


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