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Split a line on positions - Shell

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# 1  
Old 02-16-2009
Split a line on positions - Shell
Hi,
I want to split the length of a line based on the numbe of positions.

eg: ABCBEFGH IJKLMN asdfas

I want to split every 4 characters into a new line
Can i use cut or any easy way of using a single or 2 lines.

Thanks
Vijay
# 2  
Old 02-16-2009
Hammer & Screwdriver Perhaps this will work for you
Code:
> echo "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | sed -e "s/..../&~/g" | tr "~" "\n"
ABCD
EFGH
IJKL
MNOP
QRST
UVWX
YZ
> echo "ABCDEFGHIJKLMNOPQRSTUVWXYZ ABC" | sed -e "s/..../&~/g" | tr "~" "\n"
ABCD
EFGH
IJKL
MNOP
QRST
UVWX
YZ A
BC

# 3  
Old 02-16-2009
If you have a recent version of bash try:
Code:
string="ABCDEFGHIJKLM"
while [ ${#string} -gt 0 ]
do
      echo "${string:0:4}" #  4 characters 
      string="${string:4}" 
done

# 4  
Old 02-16-2009
Quote:
Originally Posted by jim mcnamara
If you have a recent version of bash try:

"recent" = any version since bash-2.0 of 1996.
Quote:
Code:
string="ABCDEFGHIJKLM"
while [ ${#string} -gt 0 ]
do
      echo "${string:0:4}" #  4 characters 
      string="${string:4}" 
done


In any POSIX shell:

Code:
string="ABCDEFGHIJKLM"
while [ ${#string} -ge 4 ]
do
    temp=${string#????}
    printf "%s\n" "${string%"$temp"}"
    string=$temp
done
[ -n "$string" ] && printf "%s\n" "$string"

# 5  
Old 02-18-2009
Split while reading a line in shell
Thanks all.
Last edited by vijaykrc; 02-18-2009 at 09:18 PM..
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