diff --git a/.github/workflows/stockfish_arm_binaries.yml b/.github/workflows/stockfish_arm_binaries.yml
index 52105eb6..1afd8efa 100644
--- a/.github/workflows/stockfish_arm_binaries.yml
+++ b/.github/workflows/stockfish_arm_binaries.yml
@@ -20,13 +20,13 @@ jobs:
             compiler: aarch64-linux-android21-clang++
             emu: qemu-aarch64
             comp: ndk
-            shell: bash {0}
+            shell: bash
           - name: Android NDK arm
             os: ubuntu-22.04
             compiler: armv7a-linux-androideabi21-clang++
             emu: qemu-arm
             comp: ndk
-            shell: bash {0}
+            shell: bash
         binaries:
           - armv8
           - armv7
diff --git a/.github/workflows/stockfish_binaries.yml b/.github/workflows/stockfish_binaries.yml
index 0a53cb03..5fe67d15 100644
--- a/.github/workflows/stockfish_binaries.yml
+++ b/.github/workflows/stockfish_binaries.yml
@@ -19,14 +19,14 @@ jobs:
             simple_name: ubuntu
             compiler: g++
             comp: gcc
-            shell: bash {0}
+            shell: bash
             archive_ext: tar
           - name: MacOS 12 Apple Clang
             os: macos-12
             simple_name: macos
             compiler: clang++
             comp: clang
-            shell: bash {0}
+            shell: bash
             archive_ext: tar
           - name: Windows 2022 Mingw-w64 GCC x86_64
             os: windows-2022
diff --git a/.github/workflows/stockfish_compile_test.yml b/.github/workflows/stockfish_compile_test.yml
index c7280a85..41f61dab 100644
--- a/.github/workflows/stockfish_compile_test.yml
+++ b/.github/workflows/stockfish_compile_test.yml
@@ -15,22 +15,22 @@ jobs:
             os: ubuntu-20.04
             compiler: g++
             comp: gcc
-            shell: bash {0}
+            shell: bash
           - name: Ubuntu 20.04 Clang
             os: ubuntu-20.04
             compiler: clang++
             comp: clang
-            shell: bash {0}
+            shell: bash
           - name: MacOS 12 Apple Clang
             os: macos-12
             compiler: clang++
             comp: clang
-            shell: bash {0}
+            shell: bash
           - name: MacOS 12 GCC 11
             os: macos-12
             compiler: g++-11
             comp: gcc
-            shell: bash {0}
+            shell: bash
           - name: Windows 2022 Mingw-w64 GCC x86_64
             os: windows-2022
             compiler: g++
diff --git a/.github/workflows/stockfish_sanitizers.yml b/.github/workflows/stockfish_sanitizers.yml
index 708c9227..ebfd809c 100644
--- a/.github/workflows/stockfish_sanitizers.yml
+++ b/.github/workflows/stockfish_sanitizers.yml
@@ -16,7 +16,7 @@ jobs:
             os: ubuntu-20.04
             compiler: g++
             comp: gcc
-            shell: bash {0}
+            shell: bash
         sanitizers:
           - name: Run with thread sanitizer
             make_option: sanitize=thread
diff --git a/.github/workflows/stockfish_test.yml b/.github/workflows/stockfish_test.yml
index 28218402..8a71d76b 100644
--- a/.github/workflows/stockfish_test.yml
+++ b/.github/workflows/stockfish_test.yml
@@ -18,38 +18,38 @@ jobs:
             comp: gcc
             run_32bit_tests: true
             run_64bit_tests: true
-            shell: bash {0}
+            shell: bash
           - name: Ubuntu 20.04 Clang
             os: ubuntu-20.04
             compiler: clang++
             comp: clang
             run_32bit_tests: true
             run_64bit_tests: true
-            shell: bash {0}
+            shell: bash
           - name: Android NDK aarch64
             os: ubuntu-22.04
             compiler: aarch64-linux-android21-clang++
             comp: ndk
             run_armv8_tests: true
-            shell: bash {0}
+            shell: bash
           - name: Android NDK arm
             os: ubuntu-22.04
             compiler: armv7a-linux-androideabi21-clang++
             comp: ndk
             run_armv7_tests: true
-            shell: bash {0}
+            shell: bash
           - name: MacOS 12 Apple Clang
             os: macos-12
             compiler: clang++
             comp: clang
             run_64bit_tests: true
-            shell: bash {0}
+            shell: bash
           - name: MacOS 12 GCC 11
             os: macos-12
             compiler: g++-11
             comp: gcc
             run_64bit_tests: true
-            shell: bash {0}
+            shell: bash
           - name: Windows 2022 Mingw-w64 GCC x86_64
             os: windows-2022
             compiler: g++
@@ -115,8 +115,8 @@ jobs:
 
       - name: Extract the bench number from the commit history
         run: |
-          git log HEAD | grep -o "\b[Bb]ench[ :]\+[1-9][0-9]\{5,9\}\b" | head -n 1 | sed "s/[^0-9]//g" > git_sig
-          [ -s git_sig ] && echo "benchref=$(cat git_sig)" >> $GITHUB_ENV && echo "Reference bench:" $(cat git_sig) || echo "No bench found"
+          benchref=$(git log HEAD | grep -m 1 -o -x "[[:space:]]*\b[Bb]ench[ :]\+[1-9][0-9]\{5,7\}\b[[:space:]]*" | sed "s/[^0-9]//g") || true
+          [[ -n "$benchref" ]] && echo "benchref=$benchref" >> $GITHUB_ENV && echo "Reference bench: $benchref" || echo "No bench found"
 
       - name: Check compiler
         run: |