Shell Programming and Scripting

while read -n1 c

 read has bad option

typeset -L1 single 
while read line 
do    
 while (( ${#line} > 0 ))    
 do   
      single="$line"        
 # do what you like with $single     
    echo $single        
 line=${line#$single}    
 done 
done < input.txt

AMIGA:~> line="This is a string with spaces."
AMIGA:~> n=0
AMIGA:~> while (( $n <= ${#line} )); do echo "${line:$n:1}"; n=$((n+1)); done
T
h
i
s

i
s

a

s
t
r
i
n
g

w
i
t
h

s
p
a
c
e
s
.

AMIGA:~> _

echo "${line:$n:1}";

bad substitution

$ printf "abc def    ghi" | perl -ne ' @x = split("",$_); print "$_\n" foreach(@x); '
a
b
c

d
e
f




g
h
i

perl -v

perl -v

This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi

Copyright 1987-2009, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl".  If you have access to the
Internet, point your browser at http://www.perl.org/, the Perl Home Page.