Alternatively you can use the octal form of the control code , " - 033 " , but the prompt setting doesn t understand this syntax itself , so you have to use " echo " and command substitution , as shown in the next example 當(dāng)然也可以使用八進(jìn)制格式的控制碼, " 033 " ,但是prompt設(shè)置并不能夠理解這個語法本身,所以您得使用" echo "和命令替換,如下例所示:
百科解釋
In computing, command substitution is a facility originally introduced in the Unix shells that allows a command to be run and its output to be pasted back on the command line as arguments to another command. Shells typically do this by creating a child process to run the first command with its standard output piped back to the shell, which reads that output, parsing it into words separated by whitespace.