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Check whether a string begin with uppercase, lowercase or digit!

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Top Forums Shell Programming and Scripting Check whether a string begin with uppercase, lowercase or digit!
# 1  
Old 03-22-2011
Hammer & Screwdriver Check whether a string begin with uppercase, lowercase or digit!
Hi every body!

I wrote script on Fedora (bash shell) to check whether a tring enter from user console is start with a uppercase/lowercase letter or a digit. But with this script i have some problem when I enter from character from 'b' to 'z' --> result is uppercase. This code look like ok but i don't know why it work not correctly. Please give me some propose.

Code:
#zdanie 3
echo "Enter a string:"
read var
echo ${var:0:1}
case ${var:0:1} in
[0-9])
    echo "$var begin with a digit."
    ;;
[A-Z])
    echo "$var begin with a uppercase letter."
    ;;
 [a-z])
    echo "$var begin with a lowercase letter."
    ;;

*)
    echo "$var begin with another symbol."
    ;;
esac

Last edited by pludi; 03-22-2011 at 04:56 AM.. Reason: code tags, please
# 2  
Old 03-22-2011
There are some wildcards missing:

Code:
echo "Enter a string:"
read var
echo ${var:0:1}
case ${var:0:1} in
[0-9]*)
    echo "$var begin with a digit."
    ;;
[A-Z]*)
    echo "$var begin with a uppercase letter."
    ;;
[a-z]*)
    echo "$var begin with a lowercase letter."
    ;;

*)
    echo "$var begin with another symbol."
    ;;
esac

# 3  
Old 03-22-2011
Tks for your reply, but the same problem when I enter character from 'b' -> 'z' the result is uppercase too.
# 4  
Old 03-22-2011
Ah ok understood and recognized it now - will check for a solution.
# 5  
Old 03-22-2011
Try this,

Code:
#!/bin/sh

echo -n "Enter a string:"
read var
first_char=${var:0:1}
len=$(expr length $(echo "$first_char" | tr -d "0-9") 2>/dev/null)
if [ $len > 0 ]
then
        len=$(expr length `echo $first_char | tr -d "a-z"` 2>/dev/null)
        if [ $len > 0 ]
        then
                len=$(expr length `echo $first_char | tr -d "A-Z"` 2>/dev/null)
                if [ $len > 0 ]
                then
                        echo "Something else"
                else
                        echo "Uppercase"
                fi
        else
                echo "lowercase"
        fi
elif [ $first_char -ge 0 2>/dev/null ]
then
echo "Number"
else
echo "Something else"
fi

Last edited by pravin27; 03-22-2011 at 05:54 AM..
This User Gave Thanks to pravin27 For This Post:
nguyendu0102
# 6  
Old 03-22-2011
Not sure why it didn't work with that syntax - the following should work. I put it into a while loop so you don't have to execute it after each input:

Code:
echo "Enter a string:"
while read var; do
        echo ${var:0:1}
        case ${var:0:1} in
        [0-9]*)
                echo "$var begin with a digit."
                ;;
        [[:upper:]])
                echo "$var begin with a uppercase letter."
                ;;
        [[:lower:]])
                echo "$var begin with a lowercase letter."
                ;;
        *)
                echo "$var begin with another symbol."
                ;;
        esac
done

exit 0

This User Gave Thanks to zaxxon For This Post:
nguyendu0102
# 7  
Old 03-22-2011
Ok. now it worked correctly! Tks so much for your help! My friends.
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