[小函数]:随机产生N位字符串

=============================================================== #!/bin/bash #Usage:rand num #产生顺序字符的函数,可参考: #http://bbs.chinaunix.net/viewthread.php?tid=676397&extra=page%3D1 #略加修改即可 ^_^ #此处设定的是50位以内的,过多的话,或许有问题 # [[ $# != 1 || $1 > 50 ]]&&{ echo "Usage ${0##/*} num";exit 1; } array=(a b c d e f g h i j k l m n o p q r s t u v \ w x y z A B C D E F G H I J K L M N O P Q R S T U V\ W X Y Z 0 1 2 3 4 5 6 7 8 9) dodo(){ echo -n ${array[$((RANDOM%${#array[@]}))]} } i=1 n=$1 while((i<=n));do dodo ((i++)) done 2>/dev/null echo =============================================================== test: /home/lee#sh rand 10 tUG2M6kTfg /home/lee#sh rand 15 MqNGlBcW7PQubAq /home/lee#sh rand 40 5XUOqD3uuTGU66YPKYujmWMzrMabVJEyj49uMXW2 /home/lee#sh rand 50 ZC3epSgNkICWLgaYhLmMEO5lfywhC5cQdMYHpsYKo5cw3mMCCs /home/lee#sh rand 51 Usage:rand num /home/lee#sh rand 12dsf #此处没作过多的处理,一个重定向打发掉 /home/lee#sh rand sdf234 Usage:rand num /home/lee#sh rand 12 PpmD58lKGEU0

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