A question about ShellScript

Source: Internet
Author: User
For a question about ShellScript-Linux general technology-Linux technology and application information, see the following for details. Write a Shell Script to make it easier to use etags. The final echo result is correct, but the resulting TAGS is empty. Please help. (I think I may not understand the shell script interpretation mechanism ).
Please correct me. (Ps. It would be better if I could recommend shell script materials by the way)

#
#
# Make etags much more powerful and easy to access
#
#

Str = "-type f-name \" *. [ch] \ "-or-name \" *. cpp \""
If [-z $ @]
Then
Command1 = "find./$ str"
Command2 = "etags -"
Else
Command1 = "find $1 $ str"
Command2 = "etags-$ {@: 2 }"
Fi

Echo "$ command1 | $ command2"
$ Command1 | $ command2
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