ex71.sh

BASH Shell 编程 经典教程 《高级SHELL脚本编程》中文版

#!/bin/bash

#  'echo'对于打印单行消息来说是非常好用的, 
#+  但是在打印消息块时可能就有点问题了. 
#   'cat' here document可以解决这个限制. 

cat <<End-of-message
-------------------------------------
This is line 1 of the message.
This is line 2 of the message.
This is line 3 of the message.
This is line 4 of the message.
This is the last line of the message.
-------------------------------------
End-of-message

#  用下边这行代替上边的第7行, 
#+   cat > $Newfile <<End-of-message
#+       ^^^^^^^^^^
#+ 那么就会把输出写到文件$Newfile中, 而不是stdout. 

exit 0


#--------------------------------------------
# 下边的代码不会运行, 因为上边有"exit 0". 

# S.C. 指出下边代码也能够达到相同目的. 
echo "-------------------------------------
This is line 1 of the message.
This is line 2 of the message.
This is line 3 of the message.
This is line 4 of the message.
This is the last line of the message.
-------------------------------------"
# 然而, 文本中可能不允许包含双引号, 除非它们被转义.