–=使用/dev/urandom产生随即数字串或字符串===
产生随机的字符串 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-10};echo jM8dJgnFs1 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-10};echo 05enzcqSzF [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-10};echo t9pDfywZdT
可以指定产生字符串的长度 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-20};echo u97bAsmkACWoHp6augVT [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-20};echo PPIxgO912ExeLQzLN4Xf [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9A-Za-z | head -c ${1:-20};echo hzARVCuk2rXUOCfLyoGq
产生随即的数字串 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9 | head -c ${1:-10};echo 7717137957 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9 | head -c ${1:-10};echo 8602026301 [root@nezhdb01 tmp]# < /dev/urandom tr -dc 0-9 | head -c ${1:-10};echo 8975427772
产生随即的小写字母串 [root@nezhdb01 tmp]# < /dev/urandom tr -dc a-z | head -c ${1:-10};echo swdpelbzpw [root@nezhdb01 tmp]# < /dev/urandom tr -dc a-z | head -c ${1:-10};echo wrlhbpqxap [root@nezhdb01 tmp]# < /dev/urandom tr -dc a-z | head -c ${1:-10};echo pmixwihjkd
产生随即的大写字母串 [root@nezhdb01 tmp]# < /dev/urandom tr -dc A-Z | head -c ${1:-10};echo HHHUIPZNPC [root@nezhdb01 tmp]# < /dev/urandom tr -dc A-Z | head -c ${1:-10};echo VSKBNJJDAF [root@nezhdb01 tmp]# < /dev/urandom tr -dc A-Z | head -c ${1:-10};echo SNPVXQTKGM
产生随即的字符串 [root@nezhdb01 tmp]# < /dev/urandom tr -dc ‘a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-10};echo T&9nwxP/4@ [root@nezhdb01 tmp]# < /dev/urandom tr -dc 'a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-10};echo IvK{H^xSir [root@nezhdb01 tmp]# < /dev/urandom tr -dc ‘a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-10};echo CQAe^~AJZC [root@nezhdb01 tmp]# < /dev/urandom tr -dc 'a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-10};echo m})PZs
长度不够可以指定长度 [root@nezhdb01 tmp]# < /dev/urandom tr -dc ‘a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-20};echo Xox!X/q7Z#F2a~oE [root@nezhdb01 tmp]# < /dev/urandom tr -dc 'a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-20};echo 7G]rvxY@h&TA [root@nezhdb01 tmp]# < /dev/urandom tr -dc ‘a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-20};echo dq(3rx4KKBrR [root@nezhdb01 tmp]# < /dev/urandom tr -dc 'a-zA-Z0-9~!@#$%^&(){}[];‘’/、’ | head -c ${1:-20};echo Q%r}jxZTz&R@^C9
–使用base64加密生成随即字符串===== 生成的字符串数字、字母、特殊字符都有（特殊字符只有“/+=”)
[root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 HboH10GR6Eh6hqpSDYHz7on526j9kcsiXjYsa1cIGWs= [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 UuN68b9AhlpT21TmMTcADXz+QCGaTl9WzxDmCHi8pnc= [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 mcyV5YBedHwnBJs3S7yy+DhDXtfdtDEmgjGzMejTNKI=
生成只有字母的串 [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z];echo IjPhSNHVEScwXgFJrvdZGcxqJGuFfOolBCs [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z];echo RhTjNwxvcCigBEWRAltvIaSOKOPicdIOlTkZaDM [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z];echo PpohxJfYbFxftrUjDtBdaXtcDlhYmwmYuOE
[root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z] |cut -c 1-10 NYfStFThZy [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z] |cut -c 1-10 bPtAucNqwx [root@nezhdb01 tmp]# head -c 32 /dev/urandom | base64 | tr -dc [a-zA-z] |cut -c 1-10 QGbgXlKIpQ
生成只有数字的串 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9];echo 1575681057544431 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9];echo 84738254914846104391273 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9];echo 55720871769217108400057121801740 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9];echo 37461946578160233
[root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9] | cut -c 1-10 4411146960 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9] | cut -c 1-10 8929713120 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | base64 | tr -dc [0-9] | cut -c 1-10 9962758034
生成数字、字母、特殊字符组合的字符串 [root@nezhdb01 tmp]# head -c 100 /dev/urandom | tr -dc ‘a-zA-z~!@#$%^&()[]’ |cut -c 1-10 Vc]EGXl#%Z [root@nezhdb01 tmp]# head -c 100 /dev/urandom | tr -dc 'a-zA-z~!@#$%^&()[]’ |cut -c 1-10 !EMDsoxHiy [root@nezhdb01 tmp]# head -c 100 /dev/urandom | tr -dc ‘a-zA-z~!@#$%^&*()[]’ |cut -c 1-10 d&yTKKbJ^$
