RosettaCodeData/Task/Find-common-directory-path/Yabasic/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 = len(x$)
if a > len(y$) a = len(y$)
if a > len(z$) a = len(z$)
for i = 1 to a
if mid$(x$, i, 1) <> mid$(y$, i, 1) break
next i
a = i - 1
for i = 1 to a
if mid$(x$, i, 1) <> mid$(z$, i, 1) break
next i
a = i - 1
if mid$(x$, i, 1) <> "/" then
for i = a to 1 step -1
if "/" = mid$(x$, i, 1) break
next i
fi
REM Task description says no trailing slash, so...
a = i - 1
print "Common path is '", left$(x$, a), "'"