what's the problem of my cygwin installation?

[thinktwice]

i use Cygwin1.7.1setup.exe to start an fresh installation, because i have
downloaded an full package from internet, so i choose local install.  setup
process finished successfully.

but when i try to open cgywin, it warns me "bash: /usr/bin/sed: No such file
or directory, bash: /bin/grep: No such file or directory bash: sed: command
not found

how to fix the problem?


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