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Multiple conditions in a CASE statement

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# 8  
Old 03-15-2011
glob vs regex
Chubler,

Nice solution for multiple variable matching. The only thing I'd add would be to note that these are 'glob' matching patterns rather than 'regex' patterns for other readers.
This User Gave Thanks to m1xram For This Post:
Chubler_XL
# 9  
Old 03-15-2011
Thanks. I thought that case was an alternate type of if-then-else statement, but you're telling me that you can test a string against certain patterns, and in this case, the string contains the values of the user entered variables?

One more thing -- how would one test for no value entered for a variable -- the null string?
# 10  
Old 03-15-2011
Yes, as you can see case has powerfull glob pattern matching (thanks for the correction m1xram) that makes it usefull in all sorts of ways beyond simple if-then-else support.

Testing for null values:

Code:
case ${vendor}_${alias} in
    _) echo Both null;;
    _*)  echo Vendor null;;
    *_)  echo Alias null;;
esac

Last edited by Chubler_XL; 03-15-2011 at 01:27 PM..
# 11  
Old 03-15-2011
PS: In case, you can usually use both ( and ) around your patterns, which is prettier if not as ancient, preserving many other nice features like the % in vi, ksh $(...), subshell (...).
# 12  
Old 03-16-2011
Chubler -- can you tell me what the difference is between glob patterns and regex patterns?
# 13  
Old 03-16-2011
Regex pattern '.' is glob pattern '?', '.*' is '*', '[...]' in glob has no negative list '[^...]', '.' is literal in glob, and then it gets muddy as even glob has some more advanced=less reliably available extensions. Glob is a bit like extended regex (egrep), but weaker. In case it is common to OR like egrep:
Code:
 
case "$a" in
(AAA|BBB|CCC)
  .
  .
  .
  ;;
([A-C][ABC][CAB])
  .
  .
  .
  ;;
esac

# 14  
Old 03-16-2011
I'm sorry, but I don't understand -- can you be a little more clear?
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