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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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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
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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