How To Check The First Character Of A String In Bash

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.

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:

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