diff --git a/DOC/installdietlibc.sh b/DOC/installdietlibc.sh
index e55fd5e2..052a39d6 100644
--- a/DOC/installdietlibc.sh
+++ b/DOC/installdietlibc.sh
@@ -10,7 +10,7 @@ echo "======= install dietlibc =============="
 rm -rf /opt/diet32
 rm -rf /opt/diet64
 
-tar -xvf dietlibc-0.34.tar.xz
+tar -xf dietlibc-0.34.tar.xz
 cd dietlibc-0.34
 
 prefix=/opt/diet64 make -j 4
@@ -19,7 +19,7 @@ prefix=/opt/diet64 make install 2>/dev/null
 cd ..
 rm -rf dietlibc-0.34
 
-tar -xvf dietlibc-0.34.tar.xz
+tar -xf dietlibc-0.34.tar.xz
 cd dietlibc-0.34
 
 sed "s/MYARCH:=.*/MYARCH=i386/" -i Makefile
diff --git a/INSTALL/all_in_one.sh b/INSTALL/all_in_one.sh
index fc385951..19d53387 100644
--- a/INSTALL/all_in_one.sh
+++ b/INSTALL/all_in_one.sh
@@ -12,7 +12,7 @@ LOG=$VTOY_PATH/DOC/build.log
 
 cd $VTOY_PATH/DOC
 cilog "prepare_env ..."
-sh prepare_env.sh
+sh prepare_env.sh >> $LOG 2>&1
 
 export PATH=$PATH:/opt/gcc-linaro-7.4.1-2019.02-x86_64_aarch64-linux-gnu/bin:/opt/aarch64--uclibc--stable-2020.08-1/bin:/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/:/opt/mips64el-linux-musl-gcc730/bin/