diff --git a/bash_course/exercisesheet/sheet.pdf b/bash_course/exercisesheet/sheet.pdf
index c72843bf39bf8655f24bd2c8c5fa4249263176aa..c5ab2acff4e2781cc6324d6874883e5bf0f2e6d7 100644
--- a/bash_course/exercisesheet/sheet.pdf
+++ b/bash_course/exercisesheet/sheet.pdf
@@ -1,3 +1,3 @@
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+oid sha256:c84aa49bd05c1e9ca49eeeaf67dacb59c46fab3337ab3815caf02c149cc925ed
 size 260700
diff --git a/bash_course/exercisesheet/sol.pdf b/bash_course/exercisesheet/sol.pdf
index 2b21550f37dc14dbb0e4bc9fccfa0da5cddb02b5..79bc58115e15218cb55f4e24aa670a1eb7434699 100644
--- a/bash_course/exercisesheet/sol.pdf
+++ b/bash_course/exercisesheet/sol.pdf
@@ -1,3 +1,3 @@
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+oid sha256:db55526cde1aa91bfc1e53aaaea372547d53c8126c77c2ee3b07b0acac932218
 size 185033
diff --git a/bash_course/guide/guide.pdf b/bash_course/guide/guide.pdf
index 124f7e3387d2c9a090b80416e196fd3296c6fecc..ca202a2997ed398e55bbf9fc7df65dcfdb9050b3 100644
--- a/bash_course/guide/guide.pdf
+++ b/bash_course/guide/guide.pdf
@@ -1,3 +1,3 @@
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-oid sha256:a11d76b133e85dce98dcc721179265e21bb92f2e5bcf5d86ac62fecda2001832
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diff --git a/bash_course/pres/pres.md b/bash_course/pres/pres.md
index 20f5258b9df1670991375ad191ae3455e361f638..58e8f271cd2c994c1f828654d76f6531e301d92b 100644
--- a/bash_course/pres/pres.md
+++ b/bash_course/pres/pres.md
@@ -264,7 +264,7 @@ becomes
 
 ### Course material
 * These slides, exercise sheet and bash guide: \
-    \soft{http://thealternative.ch/index.php?view=knowhow}
+    \soft{http://thealternative.ch}
 * Please leave some feedback! \
     \soft{http://feedback.thealternative.ch}
 
diff --git a/bash_course/pres/pres.pdf b/bash_course/pres/pres.pdf
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