Add a load of handy ~/bin scripts

bin/git-rewrite-author

@@ -0,0 +1,24 @@
+#!/bin/bash
+(( $# != 4 )) && { echo "$0 <repo> <oldmail> <newauthor> <newmail>" >&1 ; exit 1 ; }
+
+_repo="$1"
+_oldmail="$2"
+_newauthor="$3"
+_newmail="$4"
+
+cd "$_repo" || exit $?
+
+git filter-branch --force --commit-filter '
+    if [ "$GIT_AUTHOR_EMAIL" = "'"$_oldmail"'" ];
+    then
+        export GIT_AUTHOR_NAME="'"$_newauthor"'";
+        export GIT_AUTHOR_EMAIL="'"$_newmail"'";
+        git commit-tree -S "$@"
+    elif [ "$GIT_COMMITTER_EMAIL" = "'"$_oldmail"'" ];
+    then
+        export GIT_COMMITTER_NAME="'"$_newauthor"'";
+        export GIT_COMMITTER_EMAIL="'"$_newmail"'";
+        git commit-tree -S "$@"
+    fi' \
+    --tag-name-filter cat \
+    -- --branches --tags