Working with the Unix OS

Unix Tools
Korn shell
! .profile
HISTSIZE=100
export HISTSIZE
set -o vi
! .scripts
#!/bin/ksh
# @(#)fibonacci – number generator
(( fib = 1 ))
(( oldfib = 0 ))
while (( fib < 1000 )) ; do
echo $fib
(( save = fib ))
(( fib = fib + oldfib ))
(( oldfib = save ))
done
! job control
$ prog &
[1] 886
$ jobs
[1] + running prog
$ kill %1
[1] + terminated prog
$ prog
^Z
[1] + stopped prog
$ bg
[1] prog &
#!/bin/sh
# @(#)rolo - rolodex: look up, add & remove phone book entries
#
# phonebook entry
# e.g.
# name:address:city:phone:
# if it is set on entry, then leave it alone
: ${PHONEBOOK:=$HOME/phonebook}
export PHONEBOOK
if [ ! -f "$PHONEBOOK" ]; then
echo "No phone book file: $HOME/$PHONEBOOK !";
echo "Should I create it for you (y/n) ? \n"
read reply
if [ "$reply" != y ]; then
exit 1
fi
fi
> $PHONEBOOK || exit 1 # exit if creation fails
# if arguments are supplied, then do a lookup
if [ "$#" -ne 0 ]; then
rololu "$@"; exit 0
fi
# set trap on interrupt to continue loop
trap "continue" 2
40