resolve ruby gem not working in cygwin

alias ruby=’/cygdrive/c/Ruby23-x64/bin/ruby’
alias gem=’/cygdrive/c/Ruby23-x64/bin/gem.cmd’
alias irb=’/cygdrive/c/Ruby23-x64/bin/irb.cmd’
#alias compass=’/cygdrive/c/Ruby23-x64/bin/compass.bat’
alias sass=’/cygdrive/c/Ruby23-x64/bin/sass.bat’
alias scss=’/cygdrive/c/Ruby23-x64/bin/scss.bat’
#alias bundle=’/cygdrive/c/Ruby23-x64/bin/bundle.bat’

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