Linux department operation

Linux network operating system problems, first, write shell scripts to achieve addition, subtraction, multiplication and division. There is no limit to the implementation method, but try to reduce the probability of mistakes?

setd = 0；

if

then

Echo $3

d=$(($ 1-$2))

The ship does not bear the loading fee.

Echo $ TERM

How to use linux forward slash and backward slash?

1 forward slash (/) and backward slash () are symbols used as path separators in Linux systems. In Linux system, forward slash (/) is used to separate directories, and backward slash () is used to escape characters, such as n for line breaks, t for tabs, etc. 3 When entering the path on the command line, you should use a forward slash (/) to separate the directories, not a backslash (). For example: /home/user/Documents. Extended content: In addition to the path separator, the forward slash (/) has other uses, such as indicating the division operation and parameter options of some commands. The backslash () also has some special uses in Linux system, such as escape characters, which are used as one of the parameter options in some commands.