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In linux, $#, $0, 1, 2, 2, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 The meaning of

$# is the number of parameters passed to the script

$0 is the file name of the script itself

$1 is the first parameter followed by the script

$2 is the second parameter followed by the script

$@ is a list of all parameters passed to the script, "$1", "$2", "$3"... "$n"

$* displays all parameters passed to the script as a single string, "$1 $2 $3 … $n"

$is the ID number of the current process in which the script is running

$? Is the end status code of the last run command. 0 means there is no error, and others indicate that there is an error.

Summary of logical operator examples: use-a-o in the summary of the use of logical operators. Use & & | | in [[]] Test uses-a-o! Same as []

Reference link: $#, $0 in linux "1", "2", "1", "2", "" The meaning of https://my.oschina.net/u/3997182/blog/3071460

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