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There are a lot of special symbols in Linux Shell, which should be paid special attention to when we write Shell scripts: on the one hand, we should know the usage of these special symbols, these symbols can get twice the result with half the effort; on the other hand, we should avoid the excessive use of these special symbols which makes the script difficult to debug and read.

These special symbols are listed roughly as follows:

#;;. , / / 'string' |! $${} $? $$* "string" * *?: ^ $# $@ `command` {} [] [[]] () (()) | & & {xx,yy,zz,... } ~ + ~-& / + -% = =! =

Output / input redirection:

>

2 & 2 > & 2

~ represents the home directory, that is, the user directory of the currently logged in user.

For example: my login user is chen

Cd ~

~ stands for / home/chen/. Of course, the premise is that there is a user directory, and there will be more cases if there is no / home/chen directory.

/ refers to the root directory: the directory at the top of all directories.

. / indicates the current directory, and. / generally needs to be used in conjunction with other folders or files to refer to things in the current directory.

Cd. It doesn't make much sense to cd. / folder switch to a folder in the current directory

.. Represents the parent directory

Cd.. Switch to the parent directory cd.. / folder switch to a folder in the parent directory

These are the details of what "~", "/" and ". /" stand for in linux. Please pay more attention to other related articles!

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