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access each character in a string

 
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# 1  
Old 09-08-2008
access each character in a string
Hi All,
I'm writing a script where one of the parameter is a string like:
0011001100

Then I want to do a while loop, according to the value of each character.

Could tell how I can access the value of each character in the string?

Thank you,
Gino
# 2  
Old 09-08-2008
bash has special builtins for this, but on any unix box:
Code:
count=1
string="00100011"
while [[ $count -le ${#string}
do
     tmp=$(expr substr $string $count 1)
     echo $tmp
done

# 3  
Old 09-08-2008
Thank you for the reply.

I get a sytax error like this:
although i' m using bash it seems that substr

expr: syntax error
# 4  
Old 09-08-2008
${string:7:1}

Returns at the seventh character position, one character -- in bash.
# 5  
Old 09-08-2008
thank you again.

I had to do it like this to make it work.
The is string is in $3

blah=$3
flag=${blah:ID:1}

flag=${$3:ID:1}
is not accepted.
# 6  
Old 09-08-2008
Code:
#!/usr/local/bin/bash

str="00100011"
cnt=${#str}

for ((i=0; i < cnt; i++))
do
     echo ${str:$i:1}
done

# 7  
Old 09-08-2008
Code:
#!/bin/sh
str=$1
while test "$str"; do
  tail=${str#?}
  echo ${str%$tail}
  str=$tail
done

For fixing the syntax error you had before, you want flag=${3:ID:1}
 
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