switch
Another flow control command
Usage
switch [-p] (<expression>) {     case(<value>)[:]<command>     [break]     case(<value>)[:]<command>     [break]     ....     match(<wildcard_expression>)[:]<command>     [break]     ....     regexp(<regular_expression>)[:]<command>     [break]     ....     case(<value>)[:]<command>     [break]     ....     default[:]<command>     [break] }
Description
The switch command is based on the standard C 'switch' keyword. It conditionally executes groups of commands chosen from a larger set of command groups.
First <expression> is evaluated (<expression> is any arithmetic or string expression).
Then the match, regexp, case and default labels are evaluated sequentially in the order of appearance.
case(<value>)[:]<command>
The <value> is evaluated and is compared against the result of <expression>. String comparison is case insensitive.
If <value> is equal to <expression> then <command> is executed. Please note that <command> must be either a single instruction or an instruction block enclosed in braces. During or after <command> execution, if a break statement is encountered the execution of the switch is terminated, otherwise the next label is evaluated.
If the -p (--passthrough) option is enabled, than the switch command will execute all the instructions blocks until a break statement is found.
match(<value>)[:]<command>
The <value> is expected to be a wildcard expression (wildcard characters being * and ?) that is matched in a case insensitive fashion against <expression>.
If a match occurs, the related <command> is executed. The break statement is treated as in the case label.
regexp(<value>)[:]<command>
The <value> is expected to be a complete standard regular expression that is matched in a case insensitive fashion against <expression>.
If a match occurs, the related <command> is executed. The break statement is treated as in the case label.
default[:]<command>
The default label is executed unconditionally if no previous label terminated execution with the break statement.
Switches
-p | --passthrough
Use c-style 'break' flow control
Examples
# Try to change the 1 below to 2 or 3 to see the results
%tmp = 1 switch(%tmp) {     case(1):         echo \%tmp was 1!     break;     case(2)         echo \%tmp was 2!     break;     default:         echo \%tmp was not 1 nor 2: it was %tmp!     break; }
# A more complex example: change the 1 in 2 or 3 %tmp = 1 switch(%tmp) {     case(1):         echo \%tmp was 1! case(2)         echo \%tmp was 2!     break;     default:         echo \%tmp was either 1 or something different from 2 (%tmp)     break; }
# An example of the -p switch %tmp = 1 switch -p (%tmp) {     case(1):         echo \%tmp was 1!     case(2)         echo \%tmp was 1 or 2!         break;     default:         echo \%tmp was not 1 or 2 (%tmp)     break; }
# An example with strings %tmp = "This is a test" %tmp2 = "This is not a test" switch(%tmp) {     case(%tmp2)         echo \%tmp == \%tmp2         break;     case(%tmp)     {         # do not break here         echo "Yeah... It's stupid... \%tmp == \%tmp :D"     }     match("*TEST"):         echo "Matched *TEST"     regexp("[a-zA-Z ]*test"):         echo "Matched [a-zA-Z ]*text"     regexp("[a-zA-Z ]*not[a-zA-Z ]*"):         echo "Matched [a-zA-Z ]*not[a-zA-Z ]*"     default:         echo This is executed anyway (unless some break was called)     break; }

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