ex17.sh

来自「BASH Shell 编程 经典教程 《高级SHELL脚本编程》中文版」· Shell 代码 · 共 51 行

#!/bin/bash

# 作为用例, 调用这个脚本至少需要10个参数, 比如:
# ./scriptname 1 2 3 4 5 6 7 8 9 10
MINPARAMS=10

echo

echo "The name of this script is \"$0\"."
# 添加./是表示当前目录
echo "The name of this script is \"`basename $0`\"."
# 去掉路径名, 剩下文件名, (参见'basename')

echo

if [ -n "$1" ]              # 测试变量被引用.
then
 echo "Parameter #1 is $1"  # 需要引用才能够转义"#"
fi 

if [ -n "$2" ]
then
 echo "Parameter #2 is $2"
fi 

if [ -n "$3" ]
then
 echo "Parameter #3 is $3"
fi 

# ...


if [ -n "${10}" ]  # 大于$9的参数必须用{}括起来.
then
 echo "Parameter #10 is ${10}"
fi 

echo "-----------------------------------"
echo "All the command-line parameters are: "$*""

if [ $# -lt "$MINPARAMS" ]
then
  echo
  echo "This script needs at least $MINPARAMS command-line arguments!"
fi  

echo

exit 0