Rename fn

functions/set_alias_with_backup

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+# set_alias_with_backup - A Bash function to alias a command while preserving the original.
+#
+# Usage:
+#   set_alias_with_backup <new_command> <alias_name>
+#
+# Parameters:
+#   new_command: The command to alias to (e.g., "bat").
+#   alias_name: The alias name to override (e.g., "cat").
+#
+# Behavior:
+#   - Checks if the new command exists.
+#   - If it exists and the backup alias (alias_name with an underscore appended) isn't set,
+#     it creates a backup alias pointing to the original command.
+#   - Sets the alias (alias_name) to use the new command.
+#
+# Example:
+#   To alias "bat" as "cat" and preserve the original "cat" as "cat_", run:
+#       set_alias_with_backup bat cat
+set_alias_with_backup() {
+  local new_cmd="$1"
+  local alias_name="$2"
+
+  if [ -z "$new_cmd" ] || [ -z "$alias_name" ]; then
+    echo "Usage: set_overwrite_alias <new_command> <alias_name>"
+    return 1
+  fi
+
+  # Check that the new command exists.
+  if type "$new_cmd" >/dev/null 2>&1;then
+    # Define a backup alias by appending an underscore (e.g., "cat_" for "cat")
+    local backup_alias="${alias_name}_"
+
+    # If the backup alias isn't already set, create it pointing to the original command.
+    if ! type "$backup_alias" >/dev/null 2>&1; then
+      alias "$backup_alias"="$(which "$alias_name")"
+    fi
+
+    # Create the alias: e.g., alias "cat" to "bat".
+    alias "$alias_name"="$new_cmd"
+  fi
+}