我的cygwin有呢，是不是你的版本不夠高？升級一下？

test@pc ~/桌面

$ ls /bin

[.exe cygpath.exe infotocap.exe rlversion.exe

addftinfo.exe cygpcre-0.dll install-info.exe rm.exe

afmtodit cygpcre.dll install.exe rmdir.exe

apropos cygpcreposix-0.dll ipck sdiff.exe

ascii.exe cygpcreposix.dll ipcrm.exe sed.exe

awk.exe cygpopt-0.dll ipcs.exe semstat.exe

banner.exe cygreadline4.dll join.exe semtool.exe

basename.exe cygreadline5.dll kill.exe seq.exe

bash.exe cygreadline6.dll less.exe setfacl.exe

bashbug cygserver-config lessecho.exe sh.exe

bunzip2.exe cygstart.exe lesskey.exe sha1sum.exe

test@pc ~/桌面

$ ls /usr/bin

[.exe cygpath.exe infotocap.exe rlversion.exe

addftinfo.exe cygpcre-0.dll install-info.exe rm.exe

afmtodit cygpcre.dll install.exe rmdir.exe

apropos cygpcreposix-0.dll ipck sdiff.exe