add shebangs to shell scripts

clean_docker.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 EXITED=$(docker ps -q -f status=exited)
 DANGLING=$(docker images -q -f "dangling=true")
 DANGLING_VOLUME=$(docker volume ls -qf "dangling=true")

s/cut_smaller_video.sh

@@ -1,2 +1,3 @@
+#!/bin/bash
 ./s/ffmpeg -y -i /files/v/bunny_1080p_60fps.mp4 -ss 00:01:24 -t 00:00:10  /files/v/small_bunny_1080p_60fps.mp4
 ./s/ffmpeg -y -i /files/v/bunny_1080p_30fps.mp4 -ss 00:01:24 -t 00:00:10  /files/v/small_bunny_1080p_30fps.mp4

s/download_video.sh

@@ -1,2 +1,3 @@
+#!/bin/bash
 wget -O v/bunny_1080p_60fps.mp4 http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_60fps_normal.mp4
 wget -O v/bunny_1080p_30fps.mp4 http://distribution.bbb3d.renderfarming.net/video/mp4/bbb_sunflower_1080p_30fps_normal.mp4

s/start_jupyter.sh

@@ -1 +1,2 @@
+#!/bin/bash
 docker run --rm -p 8888:8888 -v $(pwd):/home/jovyan/work jupyter/scipy-notebook

setup.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 check_cmd()
 {
   if ! which $1 &>/dev/null; then