while loop help

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1

data:

1234567890abcdefghij1234567890...

code:

cut -b1-10 data >> data1
cut -b11-20 data >> data1
cut -b21-30 data >> data1

my result:

1234567890
abcdefghij
1234567890
.........

How my codes should be if I would use "while syntax" coding?

2

instead of while , u can use the awk which is very flexible enough to handle the task, since while suffers in searching a text

3 
awk ' { print substr($0,1,10) "\n" substr($0,11,10) "\n" substr($0,21,10) >> "data1" } ' data
4 
sed 's/\(.\{10\}\)\(.\{10\}\)\(.*\)/\1\
\2\
\3/' filename
5

To loop through a string, 10 characters at a time:

$ cat looper
#! /usr/bin/ksh

string=aaaaaaaaaabbbbbbbbbccccccccccddddddddddeeeeeeeeeefffffffffffgggggggggg

typeset -L10 tenchr

while ((${#string})); do
        if ((${#string} > 10)); then
                tenchr=$string
                piece=$tenchr
                string=${string#$piece}
        else
                piece=$string
                string=""
        fi
        echo $piece $string
done
exit 0
$ ./looper
aaaaaaaaaa bbbbbbbbbccccccccccddddddddddeeeeeeeeeefffffffffffgggggggggg
bbbbbbbbbc cccccccccddddddddddeeeeeeeeeefffffffffffgggggggggg
cccccccccd dddddddddeeeeeeeeeefffffffffffgggggggggg
ddddddddde eeeeeeeeefffffffffffgggggggggg
eeeeeeeeef ffffffffffgggggggggg
ffffffffff gggggggggg
gggggggggg
$