Linux Shell 笔记二(循环结构)

程序12：类似java 里面的switch case
[root@localhost scripts]# cat sh12.sh read -p "input comand:" command case $command in "fix") echo "fix system" ;; "fuck") echo "fuck you" ;; *) echo "what a stupid man!ex>$0 some word" esac exit 0

程序13：简单简单，超级简单的一个函数
[root@localhost scripts]# cat sh13.sh function printit() { echo -n "Your choice is $1" } #$1为控制台输入的第二个参数 printit 1;echo $1 | tr 'a-z' 'A-Z'

程序14:until do done
[root@localhost scripts]# cat sh14.sh until [ "$yn" = "yes" ] || [ "$yn" == "YES" ] do read -p "please input yes/to stop this program:" yn done

程序15：while do done
[root@localhost scripts]# cat sh15.sh s=0 i=0 while [ "$i" != "100" ] do i=$(($i+1)) s=$(($s+$i)) done echo "number of 1+2+3+...+100=$s"

程序16：for do done

[root@localhost scripts]# cat sh16.sh s=0 for((i=1;i<=100;i=i+1)) do s=$(($s+$i)) done echo $s exit 0

程序17:for do done(2)

[root@localhost scripts]# cat sh17.sh for animal in dog cat elephant do echo "there are ""$animal" done exit 0

程序18：利用 for do done查找某一个目录下面的文件权限信息
[root@localhost scripts]# cat sh18.sh read -p "input a directory:" dir if [ "$dir" == "" ] || [ ! -d "$dir" ]; then echo "The $dir is not exist in the system" exit 1 fi echo `ls $dir` filelist=`ls $dir` for filename in $filelist do perm=""; test -r "$dir/$filename" && perm="$perm readable" test -w "$dir/$filename" && perm="$perm writable" test -x "$dir/$filename" && perm="$perm execuatable" echo "The file $dir/$filename's permission is $perm" done

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