diff --git a/manifest b/manifest
index 83d71f54b5..4fab75a144 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Use\san\sephemeral\stable\srather\sthan\sa\sRowSet\sto\sremember\srowids\sin\sthe\ntwo-pass\sUPDATE\salgorithm,\sas\sthis\suses\smuch\sless\smemory\sfor\slarge\sUPDATEs.
-D 2020-11-19T19:43:46.382
+C The\sxFullPathname\smethod\sof\sthe\sunix\sVFS\snow\snormalizes\sthe\sfilenames\sby\nomitting\ssurplus\s"/",\s"/./"\sand\s"/../"\sstrings.
+D 2020-11-19T21:12:08.560
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -522,7 +522,7 @@ F src/os.c 80e4cf3e5da06be03ca641661e331ce60eeeeabf0d7354dbb1c0e166d0eedbbe
 F src/os.h 48388821692e87da174ea198bf96b1b2d9d83be5dfc908f673ee21fafbe0d432
 F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
 F src/os_setup.h 0dbaea40a7d36bf311613d31342e0b99e2536586
-F src/os_unix.c c19f392825f4787dbdff2637371ba2210eef8aecfc268509c7aafa9beea3a653
+F src/os_unix.c 7c42aa79024d259635a6e5099b03276942bed7d33fc2e5f76f71445042977f10
 F src/os_win.c 77d39873836f1831a9b0b91894fec45ab0e9ca8e067dc8c549e1d1eca1566fe9
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 F src/pager.c 3700a1c55427a3d4168ad1f1b8a8b0cb9ace1d107e4506e30a8f1e66d8a1195e
@@ -1336,9 +1336,9 @@ F test/server1.test c2b00864514a68a0e6fd518659dc95d0050307a357a08969872bef027d78
 F test/session.test 78fa2365e93d3663a6e933f86e7afc395adf18be
 F test/sessionfuzz-data1.db 1f8d5def831f19b1c74571037f0d53a588ea49a6c4ca2a028fc0c27ef896dbcb
 F test/sessionfuzz.c f74c4e806bab5a093fb9c11b6123d17a6e0cf73fb7a0f49b12f5a75bf0b7b1a8
-F test/shared.test 1826673eb5eb745fb91a3bdac99a7737057742ae38dcb0fe076a384d6727578b
+F test/shared.test f022874d9d299fe913529dc10f52ad5a386e4e7ff709270b9b1111b3a0f3420a
 F test/shared2.test 03eb4a8d372e290107d34b6ce1809919a698e879
-F test/shared3.test ab693f9b6e156b8bfb2a0ad94f29fe69602a5d38
+F test/shared3.test f8cd07c1a2b7cdb315c01671a0b2f8e3830b11ef31da6baa9a9cd8da88965403
 F test/shared4.test c75f476804e76e26bf6fa0e7b421fb0ca7d07558
 F test/shared6.test 866bb4982c45ce216c61ded5e8fde4e7e2f3ffa9
 F test/shared7.test a81e99f83e6c51b02ac99c96fb3a2a7b5978c956
@@ -1537,7 +1537,7 @@ F test/tkt2817.test f31839e01f4243cff7399ef654d3af3558cb8d8d
 F test/tkt2820.test 39940276b3436d125deb7d8ebeee053e4cf13213
 F test/tkt2822.test f391776423a7c0d0949edfce375708bfb0f3141e
 F test/tkt2832.test a9b0b74a02dca166a04d9e37739c414b10929caa
-F test/tkt2854.test e432965db29e27e16f539b2ba7f502eb2ccc49af
+F test/tkt2854.test 47a2ae03bf36812f675ec06806a7b958e0de75312261dd8280c187f4a4a8281a
 F test/tkt2920.test a8737380e4ae6424e00c0273dc12775704efbebf
 F test/tkt2927.test 4752868b9eeeb07a217f7f19f4cbaac98d6d086d
 F test/tkt2942.test c5c87d179799ca6d1fbe83c815510b87cd5ec7ce
@@ -1571,7 +1571,7 @@ F test/tkt3761.test b95ea9c98f21cf91325f18a984887e62caceab33
 F test/tkt3762.test 4d439ff7abdc8d9323150269d182c37c2d514576
 F test/tkt3773.test 7bca904d2a647a6a4a291bd86d7fd7c73855b789
 F test/tkt3791.test a6624b9a80b216a26cf473607f42f3e51898c267
-F test/tkt3793.test d90ffd75c52413908d15e1c44fc2ea9c80fcc449
+F test/tkt3793.test 9ee9c6f300adce634e8990a131ad5e20e22241643a1240c6b372b351205ef7cb
 F test/tkt3810.test 3a3be9965d1861bd84019875851ad5ea90fd8d76b638361514a36a48ea53191b
 F test/tkt3824.test 150aa00bb6220672e5f0eb14dc8eaa36750425f0
 F test/tkt3832.test 2300d10d57562b89875b72148338ac3e14f8847d
@@ -1885,8 +1885,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 849e4e14fd06eda512381f5f8aa65f75ad0a955e835da7c63526a53cf5e8f4dc df8ce2675b070fcdc338918e7652a26ffc90439fe399ceac206fadf8a93a681f
-R 5b0ca35860159e705bbb48c4cfa88f5f
-T +closed df8ce2675b070fcdc338918e7652a26ffc90439fe399ceac206fadf8a93a681f
+P 842c432772e6cd8464cdb7bfdb38789adeea9aa9e0486d4034cc9841f085f517 6f0d5f0949130a4688319adf05d37c5ccd683ca9ad2dacb7ce433a5fe18ac3c3
+R 9bca7f34bcf3572651c390350ebafdef
+T +closed 6f0d5f0949130a4688319adf05d37c5ccd683ca9ad2dacb7ce433a5fe18ac3c3
 U drh
-Z 0ac093dc2dc75a2b8780ce68ce6383a8
+Z 8c74c867e3ffdcd79c4ff4d10ad118b3
diff --git a/manifest.uuid b/manifest.uuid
index a5fa26bc92..c187ecc614 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-842c432772e6cd8464cdb7bfdb38789adeea9aa9e0486d4034cc9841f085f517
\ No newline at end of file
+c38dec6f52c01614c1bee8356daf0fcd9f708d029116e9bff51e06719a730dde
\ No newline at end of file
diff --git a/src/os_unix.c b/src/os_unix.c
index 18f2b54618..ee7ef26871 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6353,7 +6353,26 @@ static int unixAccess(
 }
 
 /*
+** If the last component of the pathname in z[0]..z[j-1] is something
+** other than ".." then back it out and return true.  If the last
+** component is empty or if it is ".." then return false.
+*/
+static int unixBackupDir(const char *z, int *pJ){
+  int j = *pJ;
+  int i;
+  if( j<=0 ) return 0;
+  for(i=j-1; i>0 && z[i-1]!='/'; i--){}
+  if( z[i]=='.' && i==j-2 && z[i+1]=='.' ) return 0;
+  *pJ = i-1;
+  return 1;
+}
+
+/*
+** Convert a relative pathname into a full pathname.  Also
+** simplify the pathname as follows:
 **
+**    Remove all instances of /./
+**    Remove all isntances of /X/../ for any X
 */
 static int mkFullPathname(
   const char *zPath,              /* Input path */
@@ -6362,6 +6381,7 @@ static int mkFullPathname(
 ){
   int nPath = sqlite3Strlen30(zPath);
   int iOff = 0;
+  int i, j;
   if( zPath[0]!='/' ){
     if( osGetcwd(zOut, nOut-2)==0 ){
       return unixLogError(SQLITE_CANTOPEN_BKPT, "getcwd", zPath);
@@ -6376,6 +6396,40 @@ static int mkFullPathname(
     return SQLITE_CANTOPEN_BKPT;
   }
   sqlite3_snprintf(nOut-iOff, &zOut[iOff], "%s", zPath);
+
+  /* Remove duplicate '/' characters.  Except, two // at the beginning
+  ** of a pathname is allowed since this is important on windows. */
+  for(i=j=1; zOut[i]; i++){
+    zOut[j++] = zOut[i];
+    while( zOut[i]=='/' && zOut[i+1]=='/' ) i++;
+  }
+  zOut[j] = 0;
+
+  for(i=j=0; zOut[i]; i++){
+    if( zOut[i]=='/' ){
+      /* Skip over internal "/." directory components */
+      if( zOut[i+1]=='.' && zOut[i+2]=='/' ){
+        i += 1;
+        continue;
+      }
+
+      /* If this is a "/.." directory component then back out the
+      ** previous term of the directory if it is something other than "..".
+      */
+      if( zOut[i+1]=='.'
+       && zOut[i+2]=='.'
+       && zOut[i+3]=='/'
+       && unixBackupDir(zOut, &j)
+      ){
+        i += 2;
+        continue;
+      }
+    }
+    if( j>=0 ) zOut[j] = zOut[i];
+    j++;
+  }
+  if( j==0 ) zOut[j++] = '/';
+  zOut[j] = 0;
   return SQLITE_OK;
 }
 
diff --git a/test/shared.test b/test/shared.test
index 589df4d631..a0cd0a6696 100644
--- a/test/shared.test
+++ b/test/shared.test
@@ -160,11 +160,9 @@ do_test shared-$av.1.8 {
 } {}
 
 do_test shared-$av.2.1 {
-  # Open connection db3 to the database. Use a different path to the same
-  # file so that db3 does *not* share the same pager cache as db and db2
-  # (there should be two open file handles).
+  # Open connection db3 to the database.
   if {$::tcl_platform(platform)=="unix"} {
-    sqlite3 db3 ./test.db
+    sqlite3 db3 "file:test.db?cache=private" -uri 1
   } else {
     sqlite3 db3 TEST.DB
   }
@@ -800,7 +798,7 @@ do_test shared-$av.10.3 {
   # An external connection should be able to read the database, but not
   # prepare a write operation.
   if {$::tcl_platform(platform)=="unix"} {
-    sqlite3 db3 ./test.db
+    sqlite3 db3 "file:test.db?cache=private" -uri 1
   } else {
     sqlite3 db3 TEST.DB
   }
diff --git a/test/shared3.test b/test/shared3.test
index 1d09b69b82..e313069990 100644
--- a/test/shared3.test
+++ b/test/shared3.test
@@ -70,13 +70,14 @@ do_test shared3-2.5 {
 # test case shared3-2.3 above). The goal of the following tests is to
 # ensure that the cache-size really is 10 pages.
 #
-if {$::tcl_platform(platform)=="unix"} {
-  set alternative_name ./test.db
-} else {
-  set alternative_name TEST.DB
-}
+#if {$::tcl_platform(platform)=="unix"} {
+#  set alternative_name ./test.db
+#} else {
+#  set alternative_name TEST.DB
+#}
 do_test shared3-2.6 {
-  sqlite3 db3 $alternative_name
+  #sqlite3 db3 $alternative_name
+  sqlite3 db3 "file:./test.db?cache=private" -uri 1
   catchsql {select count(*) from sqlite_master} db3
 } {0 1}
 do_test shared3-2.7 {
@@ -96,7 +97,7 @@ do_test shared3-2.8 {
   # statement above should have caused the pager to grab an exclusive lock
   # on the database file so that the cache could be spilled.
   #
-  catch { sqlite3 db3 $alternative_name }
+  catch { sqlite3 db3 "file:./test.db?cache=private" -uri 1 }
   catchsql {select count(*) from sqlite_master} db3
 } {1 {database is locked}}
 
diff --git a/test/tkt2854.test b/test/tkt2854.test
index 914ddd1b69..e5ef2da7c0 100644
--- a/test/tkt2854.test
+++ b/test/tkt2854.test
@@ -28,17 +28,7 @@ set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
 do_test tkt2854-1.1 {
   sqlite3 db test.db
   sqlite3 db2 test.db
-
-  # This is taken from shared.test.  The Windows VFS expands 
-  # ./test.db (and test.db) to be the same thing so the path
-  # matches and they share a cache.  By changing the case 
-  # for Windows platform, we get around this and get a separate
-  # connection.
-  if {$::tcl_platform(platform)=="unix"} {
-    sqlite3 db3 ./test.db
-  } else {
-    sqlite3 db3 TEST.DB
-  }
+  sqlite3 db3 "file:test.db?cache=private" -uri 1
 
   db eval {
     CREATE TABLE abc(a, b, c);
diff --git a/test/tkt3793.test b/test/tkt3793.test
index 074aab2df0..07e47eb468 100644
--- a/test/tkt3793.test
+++ b/test/tkt3793.test
@@ -13,7 +13,6 @@
 # This file implements tests to verify that ticket #3793 has been
 # fixed.  
 #
-# $Id: tkt3793.test,v 1.2 2009/06/01 16:42:18 shane Exp $
 
 
 set testdir [file dirname $argv0]
@@ -26,18 +25,10 @@ ifcapable !shared_cache||!attach {
 set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
 
 do_test tkt3793-1.1 {
-  # This is taken from shared.test.  The Windows VFS expands 
-  # ./test.db (and test.db) to be the same thing so the path
-  # matches and they share a cache.  By changing the case 
-  # for Windows platform, we get around this and get a separate
-  # connection.
-  if {$::tcl_platform(platform)=="unix"} {
-    sqlite3 db1 test.db
-    sqlite3 db2 test.db
-  } else {
-    sqlite3 db1 TEST.DB
-    sqlite3 db2 TEST.DB
-  }
+  db close
+  sqlite3 db "file:test.db" -uri 1
+  sqlite3 db1 "file:test.db?cache=private" -uri 1
+  sqlite3 db2 "file:test.db?cache=shared" -uri 1
   execsql {
     BEGIN;
     CREATE TABLE t1(a, b);