sed by examples
===========================

## Example 1
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    sed -E 's/(\b[0-9]+\b) (\b[0-9]+\b) (\b[0-9]+\b) (\b[0-9]+\b)/\4 \3 \2 \1/g'

Sample Input

        1234 5678 9101 1234  
        2999 5178 9101 2234  
        9999 5628 9201 1232  
        8888 3678 9101 1232

Sample Output

        1234 9101 5678 1234  
        2234 9101 5178 2999  
        1232 9201 5628 9999  
        1232 9101 3678 8888 


## Example 2
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        sed -E 's/([0-9]+ ){3}/**** **** **** /g'

Sample Input

        1234 5678 9101 1234  
        2999 5178 9101 2234  
        9999 5628 9201 1232  
        8888 3678 9101 1232  

Sample Output

        **** **** **** 1234
        **** **** **** 2234
        **** **** **** 1232
        **** **** **** 1232

## Example 3
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        sed -e 's/thy/{&}/Ig'

Input Format

        A text file will be piped to your command via STDIN.

Output Format

        Highlight all occurrences of 'thy'


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_BY: Farid Ahmadian_  
_TAG: sed_  
_DATE: 2020-06-02 20:36:39_