Shell Programming and Scripting

sed 's/./& /g'

# foo=abcdef

# echo "${foo//?/& }"
& & & & & & 
# echo "${foo//[a-z]/[a-z] }"
[a-z] [a-z] [a-z] [a-z] [a-z] [a-z]

# cat script
#!/bin/bash
if [ $# -ne 1 ] ;then
        echo Usage: $0 [string];exit
fi
for ((s=0;s<${#1};s++))
do
        case $final in
                ^.) final=${1:$s:1};;
                 *) final="$final ${1:$s:1}";;
        esac
done
echo $final

# /temp/script
Usage: /temp/script [string]
# /temp/script abcdef
a b c d e f

addspace () {
    LEN=${#1}
    for ((c=0;c<$LEN;c++))
    do
       echo -n "${1:$c:1} "
    done
       echo ${1:$LEN:1}
}
addspace "abcdef"

addspace () {
    LEN=${#1}
        c=0
    while [ $c -lt $LEN ]
    do
       echo -n "${1:$c:1} "
           let c=c+1
    done
    echo ${1:$LEN:1}
}
addspace "abcdef"

LEN=${#1}
count=1
    while [ "$count" -lt "$LEN" ]
    do
       echo -n "$(expr substr $1 $count 1 ) "
       count=$(($count + 1))
    done
echo

LEN=${#1}
count=1
while [ "$count" -lt "$LEN" ]
do
    echo -n "$(expr substr "$1" $count 1 ) "
    count=$(($count + 1))
done
echo "$(expr substr "$1" $count 1 )"

LEN=$((${#1} + 1))

foo "$(can infile)"