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rbgnow_110245's avatar
rbgnow_110245
Icon for Nimbostratus rankNimbostratus
Jan 16, 2009

Get multiple fields from string

How to get multiple fields from a string variable.

 

 

Example:

 

echo "a.b.c.d.e.f"|cut -d. -f2,4-6

 

b.d.e.f

 

 

trying to find the similar feature using getfield like method.
application delivery
dev
devops
iRules
  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Jan 19, 2009
    You could use getfield for each field, but I think scan would be more efficient. Here are a few examples: 

     
 when RULE_INIT { 
  
    set ip 11.22.33.44 
    scan $ip {%d.%d.%d.%d} a b c d 
    log local0. "$a, $b, $c, $d" 
  
    set str "e f g h" 
    scan $str {%s %s %s %s} a b c d 
    log local0. "$a, $b, $c, $d" 
  
    set str "i 2 k 4" 
    scan $str {%s %s %s %s} a b c d 
    log local0. "$a, $b, $c, $d" 
 }

    And the log output:

    Rule : 11, 22, 33, 44

    Rule : e, f, g, h

    Rule : i, 2, k, 4

    Aaron