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Multiple conditions in a CASE statement

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# 1  
Old 03-13-2011
Multiple conditions in a CASE statement
is it possible to use multiple conditions in a CASE statement? And if so, what is the syntax? I'm trying to use one but can't seem to get it right. I want the statement to be

Code:
CASE $vendor OR $alias
    condition 1)  statements;
    condition 2) statements;
    etc.
esac

but I keep getting syntax errors, no matter what I try. Can somene tell me what the right syntax is
# 2  
Old 03-13-2011
How about this?

Code:
CASE $vendor  in
    condition 1|condition 3)  statements;;
    condition 2|condition 4) statements;;
    etc.
esac

# 3  
Old 03-13-2011
Combine the two vars with a seperator eg for green yellow red conditions:

Code:
CASE ${vendor}+${alias} in
    *+green|green+*) statements;;
    *+yellow|yellow+*)  statements;;
    *+red|red+*)  statements;;
  etc.
esac

Last edited by Chubler_XL; 03-13-2011 at 10:13 PM..
This User Gave Thanks to Chubler_XL For This Post:
scyberboy
# 4  
Old 03-13-2011
Chubler --

I'm not sure how to interpret that statement. What I want to do is have the CASE statement test the value of the variables. So, for example I need to have the statements executed if either vendor or alias is the value in the subsequent statements. Is that what your answer means? My script, at this point, is allowing the user to enter values for two variables (as you can see), but needs to test if either of them are p, m or e, in which case the script goes back to a previous menu or exits the script altogether.
# 5  
Old 03-13-2011
Yes that is what the example I posted is doing.

To explain the values of the two variables are joined together with a + in between. (For example green+black )

The case statement *+green|green+*) will match green+black (but not yellow+black)

So for your example just replace green with m ; yellow with p and red with e:

Code:
case ${vendor}+${alias} in
    *+m|m+*) // go back to main;;
    *+p|p+*) // go to previous ;;
    *+e|e+*) // exit menu;;
 etc.
esae

# 6  
Old 03-14-2011
Thanks -- so let me see if I understand, just to be clear. The help command doesn't say anything about the + sign, nor does the bash book I have.

Just to be clear, the statement means 'Check the value of both vendor and alias. [If vendor is not one of the test criteria and is followed or preceded by the test conditions ] OR [Alias is not one of the test criteria and is followed by any of the test criteria], then execute the corresponding commands. Is that correct ?

One more thing -- how would it be written if I wanted it to check for upper and lower case, which Is what I want to do.
Last edited by Straitsfan; 03-14-2011 at 05:22 PM..
# 7  
Old 03-14-2011
The + sign used here isn't anything special to the shell it's just a char we have thrown inbetween the two variables. One could just as well use "_" or "," as long as the character isn't in the strings being tested.

What is happening is the two strings are joined together and then the glob pattern matching capabilites of the case statement are used to match what is required.

So for upper or lower case and using "_" we would have:

Code:
case ${vendor}_${alias} in
    *_[Mm]|[Mm]_*) // go back to main;;
    *_[Pp]|[Pp]_*) // go to previous ;;
    *_[Ee]|[Ee]_*) // exit menu;;
etc.
esae

The expression "*_[Mm]|[Mm]_*" equates to:
Code:
    <zero or more chars>_<upper or lower case M> ..or..
    <upper or lower case M>_<zero or more chars>

Some example strings that will match this are:
Code:
    M_NotImportant
    m_
    m_back to main
    back to main_M

Last edited by Chubler_XL; 03-15-2011 at 01:26 PM..
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