Shell Programming and Scripting

ls -l | head -1 | while read a ; do echo $a ;done

ls -l | head -1 | read a ; echo $a

# works only in ksh, not in Bourne shell or bash or dash or ...
ls -l | head -1 | read a 
echo $a

# pipe is only stdout-stdin channel between process. => read has also own env. So read set variable and die.
# Korn idea is to support how it looks => a is global variable, child process read and set value to the a.

# works in every sh-shells:
read <<EOF
$(ls -l | head -1 )
EOF
echo $a

# or
a=$(ls -l | head -1 )
echo $a

a=1000
ls -l | head -1 | read a
echo $a

f=1111
ls -1 | while read f
do
        echo $f
done
echo "F $f"

read a <<EOF
`ls -l | head -1`
EOF
echo $a

a=`ls -l | head -1`
echo $a

ls -l | head -1 | (read a; echo $a)

$ ls -l | head -1 | { read a; compute; sth; different; echo $result; }