gdb: add page

pages/common/gdb.md

@@ -0,0 +1,19 @@
+# gdb
+
+> The GNU Debugger.
+
+- Debug an executable:
+
+`gdb {{executable}}`
+
+- Attach a process to gdb:
+
+`gdb -p {{procID}}`
+
+- Execute given GDB commands upon start:
+
+`gdb -ex "{{commands}}" {{executable}}`
+
+- Start gdb and pass arguments:
+
+`gdb --args {{executable}} {{argument1}} {{argument2}}`