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function to see if variable is alphabetic


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 PostPosted: Mon May 16, 2005 8:37 pm   
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Joined: Sun May 15, 2005 9:36 pm
Posts: 669
Location: Des Moines, Iowa
Code:
### check to see if variable is alpha #####
#                                         #
#                                         #
#                                         #
### call like #############################
# if isAlpha $var                         #
# then                                    #
#    echo "alpha"                      #
# else                                    #
#    echo "non-alpha"                  #
# fi                                      #
###########################################
function isAlpha()
{
   Alpha='y'
   len=`echo ${#1}`
   for ((i=0; i<$len; i++))
   do
      val=`echo ${1:$i:1}`
      val=`echo $val | tr [:upper:] [:lower:]`
      echo $val | grep ^[a-z] > /dev/null
      retval=$?
      if [[ $retval -eq 1 ]]
      then
         Alpha='n'
         break
      fi
   done
   if [[ $Alpha = 'y' ]]
   then
      return 0
   else
      return 1
   fi
}
### end isAlpha ###


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 PostPosted: Wed Nov 15, 2006 7:58 pm   

Joined: Wed Nov 15, 2006 7:56 pm
Posts: 5
Here is a shorter version of the isAlpha fuction:

Code:
function isAlpha()
{
   non=${1//[a-zA-Z]/}
   return ${#non}
}


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