Tee命令基本行为

Question

我想通过使用while循环和read来模拟shell脚本中tee命令的行为，或者是否可以看到命令的内容。

Answer 1

不确定你在问什么，但是为了一个简单的例子，试试这个 -

file=$1             # take an argument that specifies the file to write into
exec 3>&1           # create a dup of stdout
while read line     # now for each line of input
do echo "$line" >&3 # send a copy to the dup of stdout
   echo "$line"     # and a copy into the specified file
done > $file        # this is the file redirection for the loop