Korn shell 学习

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Korn shell循环
Korn shell有4种类型的循环:for循环, while循环, until循环以及 select循环

1.for循环
# cat /script/for.sh
#!/bin/ksh
#for script
#for variable in wordlist
#do
#commands
#done
for i in a b c d e f
do
    print $i
    cp 1.sh $i.sh
done

2.while循环
# cat /script/while.sh
#!/bin/ksh
#while script
i=0
while (( i<5 ))
do
    print $i
done

3.until循环
# cat /script/until
#!/bin/ksh
#until.sh
#until command
#do
#   commands
#done
until ps -ax | grep dhcpd
do
    sleep 3
done


4.select循环
# cat /script/select.sh
#!/bin/ksh
#select.sh
#select var in wordlist
#do
#    command
#done
#PS3="Please choose one of the three color"
select color in  red black blue
do
    case $color in
    red)
    print passion!
    break;;
    black | blue )
    print poise!
    break;;
    *)
    print "$color in not noe of you color" 1>2&
    print "Try again."
    ;;
    esac
done