shell 程式設計例子—第9章原始碼
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#!/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
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#!/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
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#!/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
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#!/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
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#!/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
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#!/bin/bash
#this is a example for function
display()
display $1
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#!/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
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#!/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
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#!/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
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#!/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
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