一個代人寫作業的script,後來寫多了一個加入User script
數天前，在網上跟人聊天，該網友要寫作業，用
shell 來寫，他不會，只好代他寫了一個，那是一個
Login script,要求如下
1) 只能登入五次，錯了多於五次便exit program
2) 以一個文本文件比對口令和名字,格式是 `名字 口令'
joe 123
mary 456
peter abc
bonjovi bonjovi
3) 口令或名字錯了要提示，還有多少次嘗試
4) 口令和名字對了便提示使用者已登入了
後來又寫了加 User,第一次發貼，拿些醜醜的script 交流一下，歡迎指正錯誤或優化
謝謝 :)
這是登入的
#! /bin/bash
# a login script in pure bash, [email]twf_cc@yahoo.com.hk[/email]
max=5 # init max try
file="$HOME/sample_pass.txt" # the given file
# function to check login and pass, compare
# with the given file.
Is_correct() {
ret=flase # init a flag
while read name pass # every name and pass in file
do
[ -z "$name" -a -z "$pass" ] && continue
if [ "$x" = "$name" ] # compare with user input.
then # if given name and passwd
if [ "$y" = "$pass" ] # both are correct,
then # flag will be set to `true'
ret=true ;break
fi
fi
done
}
# function, display message
Login() {
zz=$(printf '%*s\n' 45) # print 45 space
line=${zz//' '/#} # convert space to `#'
printf "\n\n$line\n\n"
printf "%s\n" " Hello $x, welcome to Playground."
printf "\n$line\n\n"
}
# main loop
while [ $max -gt 0 ] # set timer in decrease method
do
printf "Your name? " # prompt for getting user input
read x
printf "Your password? "
read -s y # -s will not be echoed user input
Is_correct < $file # function call
if [ "$ret" != "true" ] # test return value of `flag',
then # decrease 1 if it is `false'.
((max--))
case "$max" in # reminding user how many tries are remained
[1-4])
printf "\n\nLogin incorrect, $max times left.\n\n"
;;
0)
printf "\n\nPermission denied.\n\n"
exit 65 # exit program if user tries 5 times
;;
esac
else
break # jump out loop if the `flag' is `true'
fi
done
# function call while user logname and passwd are corrected
Login
# SCRIPT END HERE
這是加 User
#! /bin/bash
# add user script, [email]twf_cc@yahoo.com.hk[/email]
# use at your own risk!
dist="$HOME/sample_pass.txt" # user login pass to be stored in here
# function, get user name
GetUserName() {
printf "Please enter name: "
read name
}
# function, get user password
GetUserPass() {
oSTTY=$(stty -g) # save default setting
x=flase # init a `flag' and null pass
pass=""
until [ "$x" = "true" ]
do
stty raw # set input to be raw input
y=$(dd bs=1 count=1 2> /dev/null) # get one char
stty -raw # everytime
# check for `CR'
if [ -z $(echo $y | tr -d "\015") ]
then
x=true # set flag be `true' if CR is pressed
else
stty echo # echo "*" each char
printf "*"
pass="$pass$y" # save password
stty -echo # disable echo, password not shown
fi # on screen
done
stty "$oSTTY" # return to default stty setting
}
ret="false" # init a flag
while [ "$ret" != "true" ]
do
GetUserName # function call
if [ -z "$name" ] # Is $name empty?
then
echo "Null string is not allowed. "
echo ""
continue # back to the looping top
fi
if [[ "$name" =~ [[:space:]]{1,} ]] # $name contains space, tab
then
echo "Name contains space is not allowed."
echo ""
continue
fi
if [ -f $dist ] # if we have sample_pass.txt, check user name
then
zz=$(grep -w "^$name" $dist |cut -d" " -f1 |tr -d " ")
fi
if [ "$name" = "$zz" ] # user name is used, sorry ;)
then
echo "$name is used by other user,try other name."
echo ""
continue
fi
ret="true" # everything ok, flag is set to `true'
done
unset ret # unset value of $ret
ret=flase # init a flag again, ;)
while [ "$ret" != "true" ]
do
printf "Enter password: " # prompt
GetUserPass
p1=$pass # save first password in p1
echo ""
if [ -z "$p1" ] # Is password empty string?
then
echo "Empty password is not allowed, "
echo "please retype password."
echo ""
continue
fi
printf "Confirm password: " # prompt for getting second pass
GetUserPass
p2=$pass # save password to another var
echo ""
if [ "$p1" != "$p2" ] # Is password same?
then
echo "Cannot confirm password, found different,"
echo "please retype password."
echo ""
continue
else
echo "$name $pass" >> $dist # everything ok,
fi # write to file
ret=true # flag is set to `true', exit looping
done
echo ""
echo "Hello $name, you are registered."
exit 0
#END OF SCRIPT
[[i] 本帖最后由 twf_cc 于 2008-3-14 18:49 编辑 [/i]]
