How to loop through every char in a string

Shell Programming and Scripting
1

for example this string: gLZMQp8i

Loop become easy if we add space between each char, How to do it?
or other solutions are welcome.

2

What you want to do in the loop?

3

try..

echo 'gLZMQp8i' | sed 's|.|&\n|g'
4

I have found this code....

var="example text";var1=$(echo $var | wc -c);for((i=$var1;i>=0;i--));do echo $var | cut -c $i;done
5

it worked great, Could you explain the usage of &
I found it
/regexp(3,n)/replacement/
Attempt to match regexp(3,n) against the pattern space. If success-
ful, replace that portion matched with replacement. The
replacement may contain the special character & to refer to that
portion of the pattern space which matched, and the special
escapes \1 through \9 to refer to the corresponding matching
sub-expressions in(1,8) the regexp(3,n).

---------- Post updated at 09:34 PM ---------- Previous update was at 09:28 PM ----------

I want to count the totoal number of each class a-z, A-Z and 0-9.

Is there better way than loop?

6

A possible solution :

$ cat count.sh
$ cat c.sh
eval $( echo "$*" | \
        awk  '
          { l += gsub(/[a-z]/, "");
            u += gsub(/[A-Z]/, "");
            d += gsub(/[0-9]/, ""); }
          END {
            printf("lower_cnt=%d;upper_cnt=%d;digit_cnt=%d\n",
                   l, u, d) } '
       )
echo lower=$lower_cnt
echo upper=$upper_cnt
echo digit=$digit_cnt
$ count.sh Happy New Year 2010
lower=9
upper=3
digit=4
$

Jean-Pierre.

7

I have tried this so...

echo 'gLZMQp8i' | sed 's/\(.\)/\1 /g'

result:
g L Z M Q p 8 i
8

I also found the interesting fold command
> echo 'gLZMQp8i' | fold -w1
g
L
Z
M
Q
p
8
i

---------- Post updated at 10:18 PM ---------- Previous update was at 10:12 PM ----------

Thanks, there must be simple way to do it.
expr is promising, but i can't get it work

 
expr "gLZMQp8i" : '[0-9]'

Now the quetion is how to sum the the number of each class?
a-z, A-Z and 0-9

---------- Post updated at 10:35 PM ---------- Previous update was at 10:18 PM ----------

That is what i have worked out so far.

var=gLZMQp8i
var2=`echo $var| sed 's/[A-Z]//g'`
total_upper= $((${#var}-${#var2}))
.....

9 
total_upper=$(echo "$var" | awk '{print gsub(/[A-Z]/,"")}')

Jean-Pierre.

10

how about something along lines of:

#   echo 'gLZMQp8i' | fold -w1 | sed 's/[a-z]/%/;s/[A-Z]/^/;s/[0-9]/=/' | sort |uniq -c | sort -nr | tr "^%=" "Ul#"
   4 U
   3 l
   1 #


i.e. 4 upper (U), 3 lower(l) and 1 number (#)

HTH