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al2文件插入到helloworld.py文件的的python2的后面，然后输出到文件combine.py。
可以用命令 awk '1;/python2/{while (getline < "al2")print}' helloworld.py > combine.py。
但是，我把al2换成变量，怎么就出错了呢？
脚本addal2.sh
#!/bin/bash
set -e
set -o xtrace
TOPDIR=$(cd $(dirname "$0")&& pwd)
file= $TOPDIR/helloworld.py
temp= $TOPDIR/combine.py
al2= $TOPDIR/al2
awk '1;/python2/{while (getline < "$al2")print}' $file > $temp
set +o xtrace
helloworld.py内容
#!/usr/bin/python2
print "Hello,world!"
name = raw_input("What is your name?")
print "Hello, "+ name + "!"
al2的内容
#Licensed to the Apache Software Foundation (ASF) under one
#or more contributor license agreements. See the NOTICE file
#distributed with this work for additional information
#regarding copyright ownership. The ASF licenses this file
#to you under the Apache License, Version 2.0 (the
#"License"); you may not use this file except in compliance
#with the License. You may obtain a copy of the License at
# #Unless required by applicable law or agreed to in writing,
#software distributed under the License is distributed on an
#"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
#KIND, either express or implied. See the License for the
#specific language governing permissions and limitations
#under the License.
xtrace output说明al2是空值，所以应该检查看你的al2赋值是如何做的
这是我的的版本，楼主比较一下
#!/bin/bash
set -e
set -o xtrace
TOPDIR=$(cd $(dirname "$0")&& pwd)
file="$TOPDIR/helloworld.py"
temp="$TOPDIR/combine.py"
al2="$TOPDIR/al2"
awk "1;/python2/{while (getline < \"$al2\")print}" $file
set +o xtrace
$./addal2.sh
+++ dirname ./addal2.sh
++ cd .
++ pwd
+ TOPDIR=/var/temp
+ file=/var/temp/helloworld.py
+ temp=/var/temp/combine.py
+ al2=/var/temp/al2
+ awk '1;/python2/{while (getline < "/var/temp/al2")print}' /var/temp/helloworld.py
#!/usr/bin/python2
#Licensed to the Apache Software Foundation (ASF) under one
#or more contributor license agreements. See the NOTICE file
#distributed with this work for additional information
#regarding copyright ownership. The ASF licenses this file
print "Hello,world!"
name = raw_input("What is your name?")
print "Hello, "+ name + "!"
+ set +o xtrace
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