要點:
- 位置參數
- 表達式運算
- 條件表達式
示例:位置參數
#! /bin/bash
if [ $# -ne 2 ]; then
echo "Usage: $0 x y"
exit 1
fi
sum=`expr $1 + $2`
echo "$1 + $2 = $sum"
exit 0
示例:目錄跳轉、執行其他的腳本
假定目前目錄下有兩個子目錄sub和sub2,下面各有一個腳本檔案sub.sh和sub2.sh。目前目錄下有個test.sh腳本,代碼如下:
#!/bin/bash
echo "test.sh"
CURDIR=`pwd`
TARGETDIR="$CURDIR/sub"
cd $TARGETDIR
source sub.sh
cd -
echo returned. `pwd`
cd $CURDIR/sub2
source sub2.sh
cd -
echo DONE!!!
sub和sub2子目錄下的腳本内容如下:
#/bin/bash
echo "this is sub."
示例的運作結果:
test.sh
this is sub.
/Users/user_name/curdir
returned. /Users/user_name/curdir
this is sub2.
/Users/user_name/curdir
DONE!!!