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If_Then_Else_Fi
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fr )
Dernière modification : 2013/01/26 19:17
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The main conditional block structure is the '''if ... then ...fi''' block. The two syntaxes are{if {[} ''expr'' {]} then ''command'' fi}and with an '''else''' expression{if {[} ''expr'' {]} then ''command 1'' else ''command 2'' fi} Never forget spaces characters before and after '''{[}''' and '''{]}'''. '---example---' {msh> set A=100 msh> if {[} $A -gt 0 {]} ; then 1> echo "A is a positive number" 1> else 1> echo "A is a negative or null number" 1> fi A is a positive number} To get information about test expressions see [test] command. Without '''else''' expression the syntax can be shorten as follow '''{[}{[} ... {]}{]} {{} ... {}}'''. {msh> ^[^[ -f filename ^]^] print Filename exists Filename exists}
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