Shell Learning Example One

Enterprise Face question 1:
Use the For loop to create a batch of 10 files in the/oldboy directory, with the name in turn:
Oldboy-1
Oldboy-2
Oldboy-3
......
Oldboy-10
Hint: In the future to test everyone file prefix is also random, the end is a number sequence.
For example, randomly create 10 files, contain Oldboy strings, end with 1-10, and the extension is HTML.
Example: afds_oldboy_1.html,khadf_oldboy_2.html

The script is as follows:

#!/bin/bash#if [!-D "./oldboy"]# then mkdir./oldboy#fi# The following statements can also achieve the function of the above judgment [!-D./oldboy] && mkdir./oldboyfo R i in ' seq 1 ' do touch./oldboy/oldboy-${i}done

or use the following command directly: Touch oldboy-{1..10}

Enterprise Face question 2:
Change all the Oldboy in the above file name to Linux (implemented with a For loop).
Hint: In the future, we will try to replace the Oldboy in the file name with Linux, and the extension to uppercase.

Non-generic:

#!/bin/bashfor i in ' seq 1 ' do mv./oldboy/oldboy-${i}./oldboy/chen-${i}done

More general:

#!/bin/bashif [-D./oldboy]then echo "if" CD./oldboyelse echo "Else" mkdir./oldboy CD./oldboyfifor i in ' ls jun* ' do MV $i ' echo $i | Sed "s/jun/chen/g" ' Done

Note the use of SED commands, which can replace characters

or use the following command directly: Rename Chen June chen*

Note the use of the Rename command, rename from to File,man rename, press Q to exit

Enterprise Face question 3:
Batch Create 10 System account OLDBOY01-OLDBOY10 and set the password (the password cannot be the same).
The number plus 0 idea: http://oldboy.blog.51cto.com/2561410/788422

#!/bin/bashfor i in ' SEQ 1 3 ' Do useradd chen${i} && echo "Chen${i}" | passwd--stdin Chen${i}done

passwd--stdin to enter the password from the standard input.

Enterprise Face question 4:
Batch Create 10 System account OLDBOY01-OLDBOY10 and set the password (password is a random 8-bit string).
Generate 8-bit random number: echo $RANDOM ' OpenSSL rand-base64 8 ' | md5sum | Cut-c 1-8

Reference:

Shell Enterprise interview and Enterprise practical problem expert explaining

Enterprise Shell common face examination questions and enterprise practical cases explained in layman's

Shell Learning Example One