Linux Combat quiz: Create users and passwords in bulk-see if you can

Linux Combat quiz: Create users and passwords in bulk-see if you can?

The old boy education of the first Combat exam: Batch Create 10 user Stu01-stu10, and set a random 8-bit password, require not to use the shell loop (for example: For,while, etc.), can only be implemented with Linux commands and pipelines.

Method 1:

# echo Stu{01..10}|tr "" \ n "|sed-r ' s# (. *) #useradd \1; pass=$ ((random+10000000)); echo "$pass" |passwd--stdin \1; Echo-e "\1 \ t ' echo" $pass "'" >>/tmp/oldboy.log#g ' |bash

# Cat/tmp/oldboy.log

The above command is actually a combination of the following commands to spell N, to give a command stu01 the user's process is disassembled as follows:

Useradd stu01;

pass=$ ((random+10000000));

echo "$pass" |passwd--stdin stu01;

Echo-e "Stu01 ' echo" $pass "'" >>/tmp/oldboy.log

Special Note: If the shell loop structure is simpler, the purpose of restricting the use of loops is to exercise the students ' Basic command application

Ability to learn that we haven't learned the shell cycle course yet.

Method 2:

# Echo stu{11..12}|xargs-n1 useradd; Echo stu{11..12}: ' Cat/dev/urandom|tr-dc 0-9|fold-w8|head-1 ' |xargs-n1|t Ee-a pass.txt|chpasswd

Method 3:

There is a wrong argument, cut should take the second field should be-F2 results should be: # echo stu{21..30} | Tr ' \ n ' | Sed-e ' S/^/useradd/'-E ' s/\ (stu[0-9]\{2\}\) $/\1 \&\& echo "\ 1: ' Echo $[$RANDOM **3] | Cut-c1-8 ' "| Tee-a UserInfo.txt | Cut-d:-f2 | passwd--stdin \1/' | Bash

Function: Create 10 users is stu21-stu30 its password is random number variables randomly generated, are saved to UserInfo.txt, format: username:passwd This write is not good if there is better must share Oh! The above random number I used to generate a date, is not correct, because there may be a repetition, so I then simply use Random**3 to take its top 8, to ensure that uniqueness

Method 4:

# Echo stu{01..10} |tr ' \ n ' |sed-rn ' [email protected]^ (. *) [email protected] \1; echo $RANDOM |md5sum|cut-c 1-8 >/data/\1;cat/data/\1|passwd--stdin \[email protected] ' |bash

This problem can not be achieved on their own students are orders based on the lack of clearance, need to add sufficient horsepower.

Linux Combat quiz: Create users and passwords in bulk-see if you can