diff --git a/how_to b/how_to
index 1c66364..1f32580 100644
--- a/how_to
+++ b/how_to
@@ -1230,6 +1230,11 @@ gdb tricks:
         (gdb) while ($i < <length>)
         > print foo[$i++].attribute
         > end
+    Dynamic printf:
+        # Breakpoint that prints instead of stopping
+        # https://sourceware.org/gdb/current/onlinedocs/gdb.html/Dynamic-Printf.html
+        # https://developers.redhat.com/articles/2021/10/13/printf-style-debugging-using-gdb-part-2
+        (gdb) dprintf meow.c:42,"foo:%d bar:%s\n", number, string
 
 Non-standard zsh cd trick:
     # https://dataswamp.org/~solene/2020-09-04-cd-command.html
@@ -1248,6 +1253,12 @@ Git:
         git config url."git@example.org:user/".pushInsteadOf "https://example.org/user/"
     Prevent git from trying to auto-detect user name and email:
         user.useConfigOnly = true
+    Revert a rebase after continue/commit:
+        # https://stackoverflow.com/a/135614
+        # Find last sane state (prefixed with "commit:" instead of "rebase:"
+        git reflog
+        # /!\ Be careful to either your modifications or remember what you did
+        git reset --hard 'HEAD@{<n>}'
 
 Setup a midi synth:
     # http://www.tedfelix.com/linux/linux-midi.html
@@ -1419,3 +1430,7 @@ Change default java environment (archlinux):
     archlinux-java status
     # Example
     archlinux set java-18-openjdk
+
+strace:
+    print all file access:
+        strace -yy -f -e trace=file -- <bin>