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Cloud computing tutorials for good programmers share syntax parsing of if nesting functions

Use the following two judgment syntax to judge the number 18, respectively, for the divisible result of 2 and 3.

Multi-condition judgment

If [test condition 1]; then

Statement executed when test condition 1 is met

Elif [test condition 2]; then

Statement executed when test condition 2 is met

Elif [test condition 3]; then

Statement executed when test condition 3 is met

Else

The statement executed when the test condition is False

Fi

Parsing of if nested syntax

If [test condition 1]; then

If [test condition 2]; then

The statement is output only when both condition 1 and condition 2 are met.

Fi

Fi

Memorization of No.3 Special symbols

The name of the execution of the $0 script

$* all parameters of this script. This option can have more than 9 parameters.

$# the number of parameters in this script

The ID number of the current process that the $script is running

$! The process ID number of the last process running in the background

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The nth parameter value of the script, natively 1... 9, position variable

$? The return value of executing the previous instruction (displays the exit status of the last command. 0 means there is no error, and any other value indicates an error)

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