寫一個腳本：
（1）能接受四個參數：start、stop、restart、status
輸入start輸出starting,腳本名為finished
（2）其它任意參數均報錯退出
#!bin/bash
#author:jian
#date:2017-11-12
#discription:
read -p “please input a string(start|stop|restart|status):” str
case “$str” in
start)
echo “starting”
;;
stop)
echo “stoping”
;;
restart)
echo “stoping”
echo “starting”
;;
status)
echo “status”
;;
*)
echo “error”
exit 1
esac
[root@centos6 script]# sh finished.sh
please input a string(start|stop|restart|status):stop
stoping
[root@centos6 script]#
please input a string(start|stop|restart|status):stop
stoping
[root@centos6 script]#
寫一個腳本判，判斷給定的用戶是否登錄了當前系統。
（1）如果登錄了，則顯示用戶已經登錄，腳本終止
（2）每3秒，查看用戶是否登錄。
while true ;do
if who|grep “^$1\>” &> /dev/null ;then
echo “$1 is login”;
break;
fi
sleep 3;
echo “$1 is nologin”
done;
[root@centos6 script]# sh login.sh hi
hi is nologin
hi is nologin
hi is nologin
hi is login
hi is nologin
hi is nologin
hi is nologin
hi is login
寫一個腳本顯示用戶要查看的信息
cpu) display cpu information
mem) display memory information
disk) display disks information
quit) quit
非此四類選項，則提升錯誤，并要求用戶重新選擇，直到給出正確的選擇為止；
cat << EOF
cpu) display cpu information
mem) display memory information
disk) display disks information
quit) quit
EOF
read str
until [ “$str” = “cpu” -o “$str” = “mem” -o “$str” = “disk” -o “$str” = “quit” ];do
read -p “please input (cpu|mem|disk|quit): ” str
done;
case $str in
cpu)
lscpu
;;
mem)
free -m
;;
disk)
fdisk -l /dev/sd[a-z]
;;
quit)
echo “exit”
exit 0
;;
esac
[root@centos6 script]# sh until.sh
cpu) display cpu information
mem) display memory information
disk) display disks information
quit) quit
mem
total used free shared buffers cached
Mem: 980 449 531 1 82 134
-/+ buffers/cache: 232 748
Swap: 2047 0 2047
cpu) display cpu information
mem) display memory information
disk) display disks information
quit) quit
mem
total used free shared buffers cached
Mem: 980 449 531 1 82 134
-/+ buffers/cache: 232 748
Swap: 2047 0 2047
寫一個腳本
（1）用函數實現返回一個用戶的uid和shell;用戶名通過參數傳遞而來；
（2）提示用戶輸入一個用戶名或輸入“quit”退出；
當輸入的用戶名，則用調用函數顯示用戶信息；
當輸入quit,則退出腳本；進一步的：顯示鍵入用戶的相關信息后，再次提醒輸出用戶名或quit;
read -p “please input username or input \”quit\” to exit: ” username
uname() {
name=$1
if id -u $name &> /dev/null ;then
userId=`grep “^$name” /etc/passwd|cut -d: -f3`
userShell=`grep “^$name” /etc/passwd|cut -d: -f7`
echo “$name”
echo “userId:$userId”
echo “userShell:$userShell”
bash “$0”
else
echo “$name is no exist”;
exit 1;
fi
}
if [ “$username” != “quit” ];then
uname $username
else
exit 0;
fi
[root@centos6 script]# sh name.sh
please input username or input “quit” to exit: root
root
userId:0
userShell:/bin/bash
please input username or input “quit” to exit:
please input username or input “quit” to exit: root
root
userId:0
userShell:/bin/bash
please input username or input “quit” to exit:
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腳本寫的還行，繼續加油。