shell 程式設計例子—第9章原始碼
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example
cd /root/txtfile/
echo "----------------" >> bac_ztg.txt
date >> bac_ztg.txt
cat ztg* >> bac_ztg.txt
echo "" >> bac_ztg.txt
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for break
echo 請在命令後輸入乙個數字n,然後會得到1+2+...+n之和
if [ $# -ne 1 ]
then
echo 請輸入並且僅輸入乙個數字
exit 1
fitotal=0
var=$1
while true
dototal=$[total+var]
var=$[var-1]
if [ $var -eq 0 ]
then
break
fidone
echo $total
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for case
cd /root/txtfile
echo please give your choice to display a file:
echo "1) display ztg1.txt"
echo "2) display ztg2.txt"
echo enter your choice:
read var
case $var in
1) cat ztg1.txt;;
2) cat ztg2.txt;;
*) echo wrong;;
esac
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for continue
echo 請在命令後輸入乙個數字n,然後會得到1-n之間奇數之和
if [ $# -ne 1 ]
then
echo 請輸入並且僅輸入乙個數字
exit 1
fitotal=0
var=$1
while true
doif [ $var -eq 0 ]
then
break
elif [ $[var%2] -eq 0 ]
then
var=$[var-1]
continue
elif true
then
total=$[total+var]
var=$[var-1]
fidone
echo $total
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for for
for num in 1 2 3 4 5 6
do echo $num的平方:
expr $num \* $num
#
done
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for function
display()
display $1
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for if
cd /root/txtfile/
if [ -f ztg1.txt ]
then
echo ztg1.txt is a file:
cat ztg1.txt
elif [ -d /root/txtfile ]
then
echo in /root/txtfile is:
dir /root/txtfile
fi++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for shift
if [ $# -eq 0 ]
then
echo no number!
exit 1
fitotal=0
until [ $# -qe 0 ]
dototal=expr $total + $1
shift
done
echo $total
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for shift_add
if [ $# -eq 0 ]
then
echo no number!
exit 1
fiexport total=0
until [ $# -eq 0 ]
dototal=$[total+$1]
shift
done
echo $total
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for until
cd /root/txtfile
echo 請輸入檔名:
read fname
echo 請輸入檔案內容,輸入end!退出:
read var
until [ $var = end! ]
doecho $var >> $fname
echo 請輸入檔案內容,輸入end!退出:
read var
done
++++++++++++++++++++++++++++++++++++++++++
#!/bin/bash
#this is a example for while
echo "請輸入數字(大於等於100將退出):"
read var
while [ $var -lt 100 ]
doecho $var的平方:
expr $var \* $var
#
echo "請輸入數字(大於等於100將退出):"
read var
done
++++++++++++++++++++++++++++++++++++++++++
shell 程式設計例子 第9章原始碼
shell 程式設計例子 第9章原始碼 bin bash this is a example cd root txtfile echo bac ztg.txt date bac ztg.txt cat ztg bac ztg.txt echo bac ztg.txt bin bash this is...
shell 程式設計例子 第9章原始碼
shell 程式設計例子 第9章原始碼 bin bash this is a example cd root txtfile echo bac ztg.txt date bac ztg.txt cat ztg bac ztg.txt echo bac ztg.txt bin bash this is...
第9章 程式設計工作的簡化
第9章 程式設計工作的簡化 1 客戶端的簡化 可使用智慧型介面指標和c 包裝類。2 智慧型介面指標 像常規介面指標一樣訪問元件，將引用計數等細節隱藏起來，並且當程式的執行離開了智慧型介面指標的作用於之後，相應的介面將被釋放掉。不適合封裝某個介面或介面集。智慧型介面指標同元件的聚合類似。3 c 包裝類...