Bash Script Parameters Case Summary

Bash Script Parameters Case Summary

Case 1: The command line parameters given two numbers, the output of the larger values;

Method 1: The following

#!/bin/bash

#Name:

#Version:

#Type:

#Date:

#Author

#Email:

If [$#-lt 2];then

echo "The Intergers."

Fi

If [$1-ge $];then

echo "Max is $"

Else

echo "Max is $"

Fi

Method 2: The following

#!/bin/bash

#Name:

#Version:

#Type:

#Date:

#Author

#Email:

Declare-i Max

If [$#-lt 2];then

echo "The Intergers."

Fi

If [$1-ge $];then

Max=$1

Else

Max=$2

Fi

echo "Max Number: $max"

Method 3: The following

#!/bin/bash

#Name:

#Version:

#Type:

#Date:

#Author

#Email:

Declare-i max=$1

If [$#-lt 2];then

echo "The Intergers."

Fi

If [$1-le $];then

Max=$2

Fi

echo "Max Number: $max"

Case 2: Pass two text file paths to the script by command, and calculate the sum of its blank lines:

#!/bin/bash

#Name:

#Version:

#Type:

#Date:

#Author

#Email:

a=$ (grep "^$" $ | wc-l)

b=$ (grep "^$" $ | wc-l)

sum=$[$a + $b]

echo "The sum is: $sum"

Case 3: Pass a user name to the script by parameter, add it when this user does not exist:

Method 1

#!/bin/bash

If [$#-lt 1];then

echo "At least one username"

Exit 2

Fi

if! grep "^$\>"/etc/passwd &>/dev/null;then

Useradd $

echo $ | passwd--stdin $ &>/dev/null

echo "Add a user $ finishd"

Fi

Method 2

#!/bin/bash

If [$#-lt 1];then

echo "At least one username"

Exit 2

Fi

If grep "^$1\>"/etc/passwd &>/dev/null;then

echo "User $ exists."

Else Useradd $

echo $ | passwd--stdin $ &>/dev/null

echo "Add a user $ finishd"

Fi

Case four write a script, pass the command two text file path to the script, calculate the sum of its blank line number:

#!/bin/bash

a=$ (grep "^$" $ | wc-l)

b=$ (grep "^$" $ | wc-l)

sum=$[$a + $b]

echo "The sum is: $sum"

Case five write a script to calculate the sum of the ID number of the 10th user and the 20th user in the/etc/passwd file

#!/bin/bash

id1=$ (cat/etc/passwd | head-10 | tail-1 | cut-d:-F3)

id2=$ (cat/etc/passwd | head-20 | tail-1 | cut-d:-F3)

sum=$[$id 1+ $id 2]

echo "The sum is: $sum"

Case six The sum of the ID of the user user1 and User2 if two users are not added

#!/bin/bash

ID user1 &>/dev/null | | Useradd user1

ID user2 &>/dev/null | | Useradd User2

user1id=$ (Id-u user1)

user2id=$ (id-u user2)

sum=$[$user 1id+ $user 2ID]

echo "The sum ID is: $sum"

Well, write it down today and continue tomorrow.

This article is from the "Li Wenming blog" blog, make sure to keep this source http://liwenming18.blog.51cto.com/11068518/1755033

Bash Script Parameters Case Summary