diff --git a/example b/example
index 1c79f80..ef515e4 100755
--- a/example
+++ b/example
@@ -48,8 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {
diff --git a/example-piped b/example-piped
index 2d962b6..3dd9bb9 100755
--- a/example-piped
+++ b/example-piped
@@ -48,7 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {
diff --git a/example-piped.ts b/example-piped.ts
index 2d962b6..3dd9bb9 100755
--- a/example-piped.ts
+++ b/example-piped.ts
@@ -48,7 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {
diff --git a/example.ts b/example.ts
index 1c79f80..ef515e4 100755
--- a/example.ts
+++ b/example.ts
@@ -48,8 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {
diff --git a/src/deno-shebang-piped.sh b/src/deno-shebang-piped.sh
index de84eed..059af58 100755
--- a/src/deno-shebang-piped.sh
+++ b/src/deno-shebang-piped.sh
@@ -48,7 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {
diff --git a/src/deno-shebang.sh b/src/deno-shebang.sh
index 429f43d..955b7b9 100755
--- a/src/deno-shebang.sh
+++ b/src/deno-shebang.sh
@@ -48,7 +48,19 @@ ensure_command_installed() {
   fi
 }
 
-DENO_VERSION_RANGE_URL_ENCODED="$(printf "%s" "${DENO_VERSION_RANGE}" | xxd -p | tr -d '\n' | sed 's/\(..\)/%\1/g')"
+percent_encode() {
+    str="$1"
+    len=$(printf "%s" "$str" | wc -c)
+    i=1
+    while [ $i -le $len ]
+    do
+        char=$(printf "%s" "$str" | cut -c $i)
+        printf '%%%02X' "'$char"
+        i=$((i+1))
+    done
+}
+
+DENO_VERSION_RANGE_URL_ENCODED="$(percent_encode "${DENO_VERSION_RANGE}")"
 DEFAULT_DENO="$(command -v deno || true)"
 
 get_largest_usable_tmpfs() {