`proxmox-boot-tool kernel remove --help`, or any version agrument
that started with a '-', lead to the grep usage message being written
into /etc/kernel/proxmox-boot-manual-kernels. The problem was `grep`
interpreted the kernel version agrument as an option since it starts
with '-'.
---
 src/bin/proxmox-boot-tool | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/bin/proxmox-boot-tool b/src/bin/proxmox-boot-tool
index 913b0f6..302974b 100755
--- a/src/bin/proxmox-boot-tool
+++ b/src/bin/proxmox-boot-tool
@@ -27,7 +27,7 @@ _remove_entry_from_list_file() {
        fi
 
        if [ -e "$file" ]; then
-               grep -vFx "$entry" "$file" > "$file.new" || true
+               grep -vFx -- "$entry" "$file" > "$file.new" || true
                mv "$file.new" "$file"
        else
                echo "'$file' does not exist.."
@@ -279,7 +279,7 @@ remove_kernel() {
                exit 1
        fi
 
-       if grep -sqFx "$ver" "$MANUAL_KERNEL_LIST"; then
+       if grep -sqFx -- "$ver" "$MANUAL_KERNEL_LIST"; then
                _remove_entry_from_list_file "$MANUAL_KERNEL_LIST" "$ver"
                echo "Removed kernel '$ver' from manual kernel list. Use the 
'refresh' command to update the ESPs."
        else
-- 
2.39.2



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