Shell Programming and Scripting

> bb="kkkk - 111\nlllll - 22222\nbbbb - 4444"
> echo "$bb"
kkkk - 111
lllll - 22222
bbbb - 4444
> nn=""
> echo "$bb"|while read ln; do 
  nn=$nn", "$(echo $ln|cut -d- -f2); 
  echo $nn; 
done; 
echo "otside: \n$nn"
, 111
, 111, 22222
, 111, 22222, 4444
otside:

>

> nn=""
> for ln in $(echo "${bb// /_}"); do 
  nn=$nn", "$(ec ${ln//_/ }|cut -d- -f2); 
  echo $nn; 
done; 
echo "otside: \n$nn"
, 111
, 111, 22222
, 111, 22222, 4444
otside:
,  111,  22222,  4444
>

#!/bin/ksh
n=1
echo "before while n=$n"
while true 
do
    n=2
    echo "inside while n=$n"
    break
done
echo "after while n=$n"

echo "before for loop n=$n"
for n in 4 5
do
   echo "inside for loop n=$n"
done
echo "outside for loop n=$n"

> n=0; while true; do n=$n", "2; break; done; echo "after $n"
after 0, 2
> n=0; echo "11\n222\n333"| while read ll; do echo "now $ll"; n=$n", "2; echo "inside $n"; done; echo "after $n"
now 11
inside 0, 2
now 222
inside 0, 2, 2
now 333
inside 0, 2, 2, 2
after 0
>

> ksh
> n=0; cat ff|while read ll; do echo "now $ll"; n=$n", "$ll; done; echo $n
now 11
now 222
now 333
0, 11, 222, 333
> ^D
> it is bash now
bash: it: command not found
> n=0; cat ff|while read ll; do echo "now $ll"; n=$n", "$ll; done; echo $n
now 11
now 222
now 333
0
> n=0; while read ll; do echo "now $ll"; n=$n", "$ll; done <ff; echo $n
now 11
now 222
now 333
0, 11, 222, 333
>