方法1 tr + head

tr -cd 'a-zA-Z0-9' </dev/urandom |head -c8

方法2 date +md5sum/sha512sum + head

date +%N
date +%N |md5sum |head -c10

方法3 RANDOM环境变量

echo $((RANDOM+10000000))

方法4 uuidgen

 uuidgen |cut -b 1-8

方法5 mkpasswd

mkpasswd|cut -b 1-8

方法6 openssl

openssl rand -base64 8
trYjiXa7NfI=

方法7 strings

strings /dev/urandom | tr -cd 'a-zA-Z0-9' |head -c8

方法8 gpg

gpg --gen-random -armor 1 12