學習shell程式設計的兩個例子



例子一：繪製特殊圖形

**如下:

#!/bin/bash

max_no=0
echo -n "enter number between (5 to 9) : "
read max_no
if ! [ $max_no -ge 5 -a $max_no -le 9 ] ; then
echo "wtf... i ask to enter number between 5 and 9, try again"
exit 1
ficlear
for (( i=1; i=i; s-- ))
doecho -n " "
done
for (( j=1; j=1; i-- ))
dofor (( s=i; s<=max_no; s++ ))
doecho -n " "
done
for (( j=1; j<=i; j++ ))
doecho -n " ."
done
echo ""
done

你應該不會被上述例子中的「關鍵字」困擾了，很多都是你熟悉的，或者從它們的名字可以猜出它們的意思，如「max」設定某個變數的最大值，「for」是乙個迴圈

輸出結果

**如下:

[root@tecmint ~]# chmod 755 special_pattern.sh

[root@tecmint ~]# ./special_pattern.sh
enter number between (5 to 9) : 6
.. .
. . .
. . . .
. . . . .
. . . . . .
. . . . . .
. . . . .
. . . .
. . .
. ..

linux終端也是支援五顏六色的，請看下面的指令碼：

**如下:

#!/bin/bash

clear
echo -e "\033[1m hello world"
# bold effect
echo -e "\033[5m blink"
# blink effect
echo -e "\033[0m hello world"
# back to noraml
echo -e "\033[31m hello world"
# red color
echo -e "\033[32m hello world"
# green color
echo -e "\033[33m hello world"
# see remaing on screen
echo -e "\033[34m hello world"
echo -e "\033[35m hello world"
echo -e "\033[36m hello world"
echo -e -n "\033[0m"
# back to noraml
echo -e "\033[41m hello world"
echo -e "\033[42m hello world"
echo -e "\033[43m hello world"
echo -e "\033[44m hello world"
echo -e "\033[45m hello world"
echo -e "\033[46m hello world"
echo -e "\033[0m hello world"

你可以對上面的列子舉一反三，把它用到你自己的指令碼中去。

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