Rating: 

I looked over the online excerpts and found the following error,

page 175:

------------

For example, if this is the script myscript:

i=0

while [ $i -lt 3 ]

do

echo "again"

i=`expr $i + 1`

done

$ ./myscript

0

1

2

The until loop repeats until a condition becomes true:

until command While the exit status of command is nonzero

do

body

done

For example:

i=0

until [ $i -gt 3 ]

do

echo "again"

i=`expr $i + 1`

done

$ ./myscript

0

1

2

The for loop iterates over values from a list:

----------

this will actually print again 3 times.

Other than that, I found the writing style very enjoyable and accessable.