RosettaCodeData/Task/Find-common-directory-path/BASIC256/find-common-directory-path....

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x = "/home/user1/tmp/coverage/test"
y = "/home/user1/tmp/covert/operator"
z = "/home/user1/tmp/coven/members"
a = length(x)
if a > length(y) then a = length(y)
if a > length(z) then a = length(z)
for i = 1 to a
if mid(x, i, 1) <> mid(y, i, 1) then exit for
next i
a = i - 1
for i = 1 to a
if mid(x, i, 1) <> mid(z, i, 1) then exit for
next i
a = i - 1
if mid(x, i, 1) <> "/" then
for i = a to 1 step -1
if "/" = mid(x, i, 1) then exit for
next i
end if
REM Task description says no trailing slash, so...
a = i - 1
print "Common path is '"; left(x, a); "'"