ksh 控制结构

if 语句

#!/bin/ksh

typeset -i x=20;
typeset -i y=3;

if [[ $x -gt $y ]]; then
	print "#** $x >= $y **#"
fi

if [[ $x -gt $y ]]; then
	print "#** $x > $y **#"
else
	print "#** $x <= $y **#"
fi

if [[ $x -gt $y ]]; then
	print "#** $x > $y **#"
elif [[ $x -eq $y ]]; then
	print "#** $x = $y **#"
else
	print "#** $x < $y **#"
fi

case 语句

#!/bin/ksh

typeset opt='a';

case $opt in
	a) print "$opt is a";;
	b) print "$opt is b";;
	c|d) print "$opt is c or d";;
	*) print "Option not support...";;
esac

while 语句

#!/bin/ksh

typeset -i n=0;
typeset -i sum=0;

while [[ $n -lt 11 ]]; do
	(( sum += n++ ));
done
print "sum=$sum";

until 语句

#!/bin/ksh

typeset -i n=0;
typeset -i sum=0;

until [[ $n -gt 10 ]]; do
	(( sum += n++ ));
done
print "sum=$sum";

for 语句

#!/bin/ksh

# 格式1
integer sum=0;
for ((i = 1; i <= 10; i++))
do
    ((sum+=i));
done
print $sum

# 格式2
for foo in $(ls); do
   if [[ -d $foo ]];then
      print "$foo is a directory"
   else
      print "$foo is a file"
   fi
done

select 语句

#!/bin/ksh  

# select 语句应用在交互式程序，显示一个菜单供用户输入
select opt in a b c d; do
	
	# $REPLY 是个内置变量，存储用户输入的数字
	case $REPLY in
		1 ) print "$opt"; break;;
		2 ) print "$opt"; break;;
		3 ) print "$opt"; break;;
		4 ) print "$opt"; break;;
		* ) print "invalid, please select again.";;
	esac

done

循环控制语句

#!/bin/ksh

# break：退出循环  
# continue：执行下一循环