How to check the first character of a string in Bash

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3 years ago

How to check the first character of a string in Bash

In this post we will give you information about How to check the first character of a string in Bash. Hear we will give you detail about How to check the first character of a string in BashAnd how to use it also give you demo for it if it is necessary.

we are going to learn about how to check the first character of a string in Bash or UNIX shell.

Consider, we have the following string:

url="/src/imgs/car.png"

Now, we need to check if the first character of the above string is slash / or not.

Change default configuration name of Laravel's created_at and updated_at

In this post we will give you information about Change default configuration name of Laravel's created_at and updated_at. Hear we will give you detail about Change default configuration name of Laravel's created_at and updated_atAnd how to use it also give you demo for it if it is necessary.

In this Laravel PHP Tutorial, I will let you know the use of created_at and updated_at column in a database table.

By default, Eloquent automatically maintain the date time value in created_at and updated_at column on your database table. If you do not want for eloquent to maintain created_at and updated_at columns then disable it by adding following property in your model class :

class Member extends Eloquent {
 protected $table='members';
 public $timestamps= false;
}

class Member extends Eloquent {

 protected $table = 'members';

 public $timestamps = false;

}

If you want to map Laravel's timestamp from created_at to created_on and updated_at to modified_on then you can override const on your model in following way :

const CREATED_AT = 'created_on';
const UPDATED_AT = 'modified_on';

Now Eloquent will take care of the column "created_on" and "modified_on" on your database table.

How to disable created_at and updated_at timestamps in Laravel Model?

Try this..

Label :

PHP Laravel PHP Framework How To MVC Web Development

Hope this code and post will helped you for implement Change default configuration name of Laravel's created_at and updated_at. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs

For More Info See :: laravel And github

Checking the first character

To check the first character of a string in the bash shell, we can use the substring expansion syntax {$string::length} .

length: The number of characters we need to extract from a string.

Here is an example:

url="/src/imgs/car.png"if [[ ${url::1} == "/" ]]then  echo 1;else  echo 0; fi

Output:

In the example above, we are returing 1 if a first is slash / ; otherwise we are returning 0.

Similarly, you can also check the first two characters of a string like this:

url="/src/imgs/car.png"if [[ ${url::2} == "/s" ]]then  echo 1;else  echo 0; fi

Output:

Hope this code and post will helped you for implement How to check the first character of a string in Bash. if you need any help or any feedback give it in comment section or you have good idea about this post you can give it comment section. Your comment will help us for help you more and improve us. we will give you this type of more interesting post in featured also so, For more interesting post and code Keep reading our blogs

For More Info See :: laravel And github