Argument passing


 
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# 1  
Old 03-14-2013
Argument passing

How to pass the alphabet character as a argument in case and in if block?

ex:
Code:
c=$1
if [[ c -eq a-z ]]
then
echo "alphabet"
 
case $1 in
a-z) echo "the value is a alphabet"

Moderator's Comments:
Mod Comment edit by bakunin: please use CODE-tags. We REALLY mean it.

Last edited by Roozo; 03-14-2013 at 05:18 AM..
# 2  
Old 03-14-2013
Code:
c=$1
if [[ $c =~ "[a-z]" ]]
then
    echo "alphabet"
fi

Code:
c=$1
case $c in
    [a-z] ) echo "alphabet" ;;
    [0-9] ) echo "number" ;;
    *     ) exit
esac

# 3  
Old 03-14-2013
I tried this, but im getting error while using this : =~ unexpected


Code:
#!/bin/ksh
set -x
c=$1
if [[ $c -le 9 ]]
then
     echo "Digit"
elif [[ $c =~ "[a-z]" ]]
then
     echo "letter"
else
     echo "More than one char in length"
fi
 
case $c in
     [0-9] ) echo "The value is a number"
          ;;
     [a-z] ) echo "the value is a alphabet"
          ;;
     *) echo "Other"
          ;;
esac
 
 
./file 4 
Syntax error at line 8 : `=~' unexpected

Moderator's Comments:
Mod Comment edit by bakunin: kudos for using CODE-tags. If you could now refrain from using these FONT-tags of which i just cleared out half a ton and indent your source code so that it is better readable I'll be eternally indebted to you.

Last edited by bakunin; 03-14-2013 at 07:11 AM..
# 4  
Old 03-14-2013
Try using:

Code:
if [ `echo $c | grep -e "[a-z]"` ] ; then
  echo "found"
else
  echo "no found"
fi


cheers,
Devaraj Takhellambam
# 5  
Old 03-14-2013
Code:
#!/bin/ksh
set -x

c=$1
if [[ $c = @([0-9]) ]]
then
echo "Digit"
elif [[ $c = @([a-z]) ]]
then
echo "letter"
else
echo "More than one char in length"
fi

case $c in

@([0-9]) ) echo "The value is a number"
;;
@([a-z]) ) echo "the value is a alphabet"
;;
*) echo "Other"
;;
esac

# 6  
Old 03-14-2013
Thanks Devtakh and Anbu... those are working well!!
# 7  
Old 03-14-2013
Given your original problem statement and using only features defined by the POSIX standards and the Single UNIX Specification, you could try:
Code:
if [ $# -ne 1 ]
then    echo "Usage: $(basename $0) single_character" >&2
        exit 1
elif [ ${#1} -eq 0 ]
then    echo "$(basename $0): argument is an empty string" >&2
        exit 2
elif [ ${#1} -gt 1 ]
then    echo "$(basename $0): argument is more than a single character" >&2
        exit 3
fi
case "$1" in
([[:digit:]])   echo "digit";;
([[:alpha:]])   echo "letter";;
(*)             echo "other";;
esac

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