Linux Base shell script problem

1. Write Script/root/bin/sumid.sh, calculate the sum of the ID of the 10th user and the 20th user in the/etc/passwd file

Solution: vim/root/bin/sumid.sh

#!/bin/bash

Tenuser= ' cat/etc/passwd | Head-n10 | Tail-n1 |cut-d:-f3 '

Twentyuser= ' cat/etc/passwd | Head-n20 |tail-n1 | cut-d:-f3 '

Let Sum=$[tenuser+twentyuser]

echo "The Tenuser and Twentyuser finally is $sum"

2, write the script/root/bin/sumspace.sh, pass two file path as parameters to the script, calculate the sum of all the blank lines in the two files

Solution: vim/root/bin/sumspace.sh

#!/bin/bash

First= ' Cat $ | grep "^[[:space:]]*$" | Wc-l '

Second= ' Cat $ | grep "^[[:space:]]*$" | Wc-l '

Let Sum=$[first+second]

Echo $sum

3, scripting/root/bin/sumfile.sh, Statistics/etc,/var,/usr directory total number of sub-directories and files

Solution: vim/root/bin/sumfile.sh

#!/bin/bash

First= ' Ls-l/etc | Egrep "(^d.*) | (^-.*)" | Wc-l '

Second= ' Ls-l/var | Egrep "(^d.*) | (^-.*)" | Wc-l '

third= ' ls-l/usr | Egrep "(^d.*) | (^.*)" | Wc-l '

Let Sum=$[first+second+third]

Echo $sum

4, write the script/root/bin/argsnum.sh, accept a file path as a parameter, if the number of parameters is less than 1, the user is prompted "at least one parameter should be given", and immediately exit;

If the number of arguments is not less than 1, the number of blank lines in the file pointed to by the first parameter is displayed

Solution: vim/root/bin/argsnum.sh

#!/bin/bash

["$#"-lt 1] && echo "The Must one arg" && exit 20

[-E] | | {echo "No such file or directory" && exit 30;}

["$#"-ge 1] && echo "The Blankspace is ' grep" ^[[:space:]]*$ "$ | Wc-l ' "

5, write script/root/bin/hostping.sh, accept the IPV4 address of a host as parameter, test whether can connect. If it is able to ping, the user is prompted to "the IP address is accessible";

If the result is not ping, the user is prompted "The IP address is inaccessible"

Solution: [[! $ =~ ([0-9]|[ 1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]) \.) {3} ([0-9]| [1-9] [0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]]]

&& echo "Please print right IP format!" && exit 20

' Ping $1-c1 &>/dev/null ' && echo ' Yes ' | | echo "No"

6, write script/root/bin/checkdisk.sh, check the disk partition space and inode utilization, if more than 80%, the broadcast warning space will be full

Solution: vim/root/bin/checkdisk.sh

disk= ' Df-h | GREP/DEV/SD | Tr-s ""% | Cut-d%-f5 | Sort-nr | Head-n1 '

Inode= ' Df-i | GREP/DEV/SD | Tr-s ""% | Cut-d%-f5 | Sort-nr | Head-n1 '

["$disk"-GT] && echo "The disk is" $disk "% would man" | | echo the disk size is "$disk"%

["$inode"-GT 5] && echo the inode is ' $inode '% man | | {echo the Indoe size is "$inode" && exit 30;}

7, write script/bin/per.sh, judge the current user to the specified parameter file, whether unreadable and not writable

Solution: vim/bin/per.sh

#!/bin/bash

[!-r "[email protected]"] && [!-W "[email protected]"] && echo the "[email protected]" is not having W and r Permisson or have some one Permisson | | echo the "[email protected]"

Have W and R permission

#另一种写法

[! \ (-r "[email protected]"-A-W "[email protected]" \)] && echo the "[email protected]" is not having W and R P Ermisson or some one Permisson | | echo the "[email protected]"

Have W and R permission

8, write script/root/bin/excute.sh, determine whether the parameter file is the sh suffix of the ordinary file, if it is, add everyone can execute permissions, otherwise prompt the user non-script file

Solution: vim/root/bin/excute.sh

[["[Email protected]" =~ *\.sh]] && ' chmod a+x ' [email protected] ' | | echo the "[email protected]" is not a script file

9, write scripts/root/bin/nologin.sh and login.sh, implement prohibit and allow ordinary user login system

Solution: vim/root/bin/nologin.sh

#!/bin/bash

Touch/etc/nologin

echo "Disabled common user Login"

vim/root/bin/nologin.sh

#!/bin/bash

Rm-rf/etc/nologin

Prohibit normal user to execute the first script when logging in, allow to execute second script after login

10, write script/root/bin/agree.sh, prompt the user to enter a variety of yes or no can, enter the wrong words prompt "Please enter the correct option"

Solution: vim/root/bin/agree.sh

#!/bin/bash

Read-p "Do you agree,plase print Yes or No:" ANS (#变量名)

[["$ANS" =~ [yy]| [Yy] [Ee] [ss]| [Nn] [oo]| [Nn]] || {echo "Input right Options" && exit 20;}

11, let all users of the PATH environment variable value One more path, for example:/usr/local/apache/bin

Solution: Vim/etc/profile

Path= $PATH: $HOME/bin:/usr/local/apache/bin

Source/etc/profile

12. When the user root logs in, the command indicator turns red, and the following aliases are automatically enabled:

Rm= ' Rm–i '

cdnet= ' cd/etc/sysconfig/network-scripts/'

editnet= ' Vim/etc/sysconfig/network-scripts/ifcfg-eth0 '

Editnet= ' vim/etc/sysconfig/network-scripts/ifcfg-eno16777736 or Ifcfg-ens33 ' (if the system is CentOS7)

Solution: Vim ~/.BASHRC

Rm= ' Rm–i '

cdnet= ' cd/etc/sysconfig/network-scripts/'

editnet= ' Vim/etc/sysconfig/network-scripts/ifcfg-ens33 '

Export ps1= ' \[\e[1;31m\][\[email protected]\h \w]\$\[\e[0m\] '

SOURCE ~/.BASHRC

13, any user login system, display the warning message "hi,dangerous!" Red font ”

Solution: vim/etc/profile.d/danger.sh

#!/bin/bash

Echo-e "\033[1;5;31mhi,dangerous!\033[0m"

14, write script to generate basic format of script, including author, contact, version, time, description, etc.

Solution: vim/root/bin/createscript.sh

#!/bin/bash

Touch

chmod +x $

echo "#/bin/bash

#*************************************

#Filename: $

#Author: Fang

#Date: ' Date ' +%y-%m-%d%h:%m:%s "'

#************************************* ">

Vim + $

Linux Base shell script problem