tr command causes problems in cygwin bash.exe shell, but works in mintty.exe

Question

I use Windows with cygwin. The following command should output the number of occurrences of '/' in the string "./bootstrp3.cab". It works when I use the mintty.exe shell and outputs "1":

echo ./bootstrp3.cab | tr -cd / | wc -c

Unfortunately it outputs the following message with the bash.exe shell

Usage:
tr [-cs] string1 string2
tr -s[-c] string1
tr -d[-c] string1
tr -ds[-c] string1 string2

It seems that the two shells behave differently, but they both seem to be the same kind of shell, because when I echo $0, bash.exe outputs bash and mintty.exe outputs -bash.

I also tried the command with the bourne shell (sh.exe), but it outputs the same message as with the bash.exe shell.

Does anyone know how I can get the command working with the sh.exe or bash.exe shell? And does someone know why the two bash shells behave differently?

Answer 1

You can do the same thing using sed and wc:

echo -n ./bootstrp3.cab | sed 's![^/]!!g' | wc -c