列表由一串命令用與運算&&和或運算||連接而成
與命令的基本格式為：
命令1 && 命令2 && 命令3 && 命令4 && ... && 命令n
或命令的基本格式為：
命令1 || 命令2 || 命令3 || 命令4 || ... || 命令n
vi andlist1.sh
#!/bin/bash
#if條件是一個與列表
if [ -n "$1" ] && echo "The lst argument=$1" && [ -n "$2" ] && echo "The 2nd argument=$2"
then
#只有與列表命令都執行完，才執行下面的命令
echo "At least TWO arguments are passed to this script."
else
echo "Less than TWO argements are passed to this script."
fi
exit 0
./andlist1.sh CAI
The lst argument=CAI
Less than TWO argements are passed to this script.
./andlist1.sh CAI WU
The lst argument=CAI
The 2nd argument=WU
At least TWO arguments are passed to this script.
./andlist2.sh CAI
Usage: andlist2.sh 3 arguments
echo $?
68
./andlist2.sh CAI WU TANG
Correct arguments are passed to this script.
echo $?
0
vi orlist.sh
#!/bin/bash
MAXARGS=3
ERROR=68
#與andlist2.sh腳本相比，僅修改了test語句
test $# -eq $MAXARGS || (echo "Usage: `basename $0` " $MAXARGS arguments && false) || exit $ERROR
echo "Correct arguments are passed to this script."
exit 0
./orlist.sh CAI
Usage: orlist.sh 3 arguments
echo $?
68
./orlist.sh CAI WU TANG
Correct arguments are passed to this script.
echo $?
0