diff --git a/programs/git-filter-repo.bash b/programs/git-filter-repo.bash
new file mode 100644
index 00000000..0d7a3f2c
--- /dev/null
+++ b/programs/git-filter-repo.bash
@@ -0,0 +1,65 @@
+function git_filter_repo_finish_push() {
+    if [ -z "$BH_LAST_ORIGIN" ]; then
+        log_msg "var BH_LAST_ORIGIN not defined (maybe this is a new shell after editing). please restart editing!"
+        return
+    fi
+
+    log_msg "Is it to force push branch $BH_LAST_BRANCH to origin $BH_LAST_ORIGIN (y/n)? "
+    answer=$(while ! head -c 1 | grep -i '[ny]'; do true; done)
+    if echo "$answer" | grep -iq "^y"; then
+        git remote add origin $BH_LAST_ORIGIN
+        git push --set-upstream origin $BH_LAST_BRANCH --force
+    fi
+}
+
+alias _git_filter_repo_save_origin_and_branch='if [[ -n $(git remote get-url origin) ]]; then BH_LAST_ORIGIN=$(git remote get-url origin); BH_LAST_BRANCH=$(git branch --show-current); fi'
+alias _git_filter_repo_test_and_msg='if [ $? -eq 0 ]; then log_msg "fiter-repo succeeded. check if you agree and run git_filter_repo_finish_push to push"; fi'
+
+function git_filter_repo_messages_to_lower_case() {
+    _git_filter_repo_save_origin_and_branch
+    log_msg git-filter-repo --message-callback "'return message.lower()'" --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_messages_remove_str() {
+    : ${2?"Usage: ${FUNCNAME[0]} <str> "}
+    _git_filter_repo_save_origin_and_branch
+    log_msg git-filter-repo --message-callback "'return message.replace(b\"$1\", b\"\")'" --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_user_rename_to_current() {
+    log_msg "Do want use the user.email=$(git config user.email)(y/n)? "
+    answer=$(while ! head -c 1 | grep -i '[ny]'; do true; done)
+    _git_filter_repo_save_origin_and_branch
+    local new_name="$(git config user.name)"
+    local new_email="$(git config user.email)"
+    git-filter-repo --name-callback "'return b\"$new_name\"'" --email-callback "'return b\"$new_email\"'" --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_user_rename_as_mailmap() {
+    _git_filter_repo_save_origin_and_branch
+    : ${1?"Usage: ${FUNCNAME[0]} <mailmap>. See more at 'https://htmlpreview.github.io/?https://github.com/newren/git-filter-repo/blob/docs/html/git-filter-repo.html#:~:text=User%20and%20email%20based%20filtering'"}
+    git-filter-repo --mailmap "$1" --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_delete_file_bigger_than_50M() {
+    _git_filter_repo_save_origin_and_branch
+    git-filter-repo --strip-blobs-bigger-than 50M --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_delete_file_bigger_than_1M() {
+    _git_filter_repo_save_origin_and_branch
+    git-filter-repo --strip-blobs-bigger-than 50M --force
+    _git_filter_repo_test_and_msg
+}
+
+function git_filter_repo_delete_file() {
+    : ${1?"Usage: ${FUNCNAME[0]} <filename>"}
+    _git_filter_repo_save_origin_and_branch
+    git-filter-repo --use-base-name --invert-paths --path "$1" --force
+    _git_filter_repo_test_and_msg
+}
diff --git a/programs/git.bash b/programs/git.bash
index 06ae4646..4a96f3ba 100644
--- a/programs/git.bash
+++ b/programs/git.bash
@@ -99,65 +99,3 @@ function git_tag_move_to_head_and_push() {
     git tag $1
     git push --force --tags
 }
-
-# git filter repo
-
-function git_filter_repo_finish_push() {
-    if [ -z "$BH_LAST_ORIGIN" ]; then
-        log_msg "var BH_LAST_ORIGIN not defined (maybe this is a new shell after editing). please restart editing!"
-        return
-    fi
-
-    log_msg "Is it to force push branch $BH_LAST_BRANCH to origin $BH_LAST_ORIGIN (y/n)? "
-    answer=$(while ! head -c 1 | grep -i '[ny]'; do true; done)
-    if echo "$answer" | grep -iq "^y"; then
-        git remote add origin $BH_LAST_ORIGIN
-        git push --set-upstream origin $BH_LAST_BRANCH --force
-    fi
-}
-
-alias _git_filter_repo_save_origin_and_branch='if [[ -n $(git remote get-url origin) ]]; then BH_LAST_ORIGIN=$(git remote get-url origin); BH_LAST_BRANCH=$(git branch --show-current); fi'
-alias _git_filter_repo_test_and_msg='if [ $? -eq 0 ]; then log_msg "fiter-repo succeeded. check if you agree and run git_filter_repo_finish_push to push"; fi'
-
-function git_filter_repo_messages_to_lower_case() {
-    _git_filter_repo_save_origin_and_branch
-    log_msg git filter-repo --message-callback "'return message.lower()'" --force
-    _git_filter_repo_test_and_msg
-}
-
-function git_filter_repo_messages_remove_str() {
-    : ${2?"Usage: ${FUNCNAME[0]} <str> "}
-    _git_filter_repo_save_origin_and_branch
-    log_msg git filter-repo --message-callback "'return message.replace(b\"$1\", b\"\")'" --force
-    _git_filter_repo_test_and_msg
-}
-
-function git_filter_repo_user_rename_to_current() {
-    log_msg "Do want use the user.email=$(git config user.email)(y/n)? "
-    answer=$(while ! head -c 1 | grep -i '[ny]'; do true; done)
-    _git_filter_repo_save_origin_and_branch
-    local new_name="$(git config user.name)"
-    local new_email="$(git config user.email)"
-    git filter-repo --name-callback "'return b\"$new_name\"'" --email-callback "'return b\"$new_email\"'" --force
-    _git_filter_repo_test_and_msg
-}
-
-function git_filter_repo_user_rename_as_mailmap() {
-    _git_filter_repo_save_origin_and_branch
-    : ${1?"Usage: ${FUNCNAME[0]} <mailmap>. See more at 'https://htmlpreview.github.io/?https://github.com/newren/git-filter-repo/blob/docs/html/git-filter-repo.html#:~:text=User%20and%20email%20based%20filtering'"}
-    git filter-repo --mailmap "$1" --force
-    _git_filter_repo_test_and_msg
-}
-
-function git_filter_repo_delete_file_bigger_than_50M() {
-    _git_filter_repo_save_origin_and_branch
-    git filter-repo --strip-blobs-bigger-than 50M --force
-    _git_filter_repo_test_and_msg
-}
-
-function git_filter_repo_delete_file() {
-    : ${1?"Usage: ${FUNCNAME[0]} <filename>"}
-    _git_filter_repo_save_origin_and_branch
-    git filter-repo --use-base-name --invert-paths --path "$1" --force
-    _git_filter_repo_test_and_msg
-}