1.5.18: commands don't work after Cygwin update

[Shaun Gittens]

I just upgraded Cygwin on Windows XP.  The previous version I was 
running (I installed it in Jan 2005) worked fine.  Now, post-upgrade, 
almost no commands work at the prompt of the bash shell.

====
bash-3.00$  ls
bash:  ls: command not found
bash-3.00$ cygcheck
bash: cygcheck: command not found
bash-3.00$ gcc
bash:  gcc : command not found

====

Running setup.exe went off without a hitch for the most part.  I'm not 
sure what could have gone wrong in the upgrade.  Any ideas why this 
won't work all of a sudden?

Thank you for your time.

Shaun.

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