Need Code or Guidance on Rename files even any no. of files present in particular directory(including more than thousands of files) using Unix Shell Script

 Consider particular directory contain n no. of input files. Rename each input files which available in particular directory with  provided new file name.

Example: 

Rename file from Old FileName to New FileName Details:

Input Files in Particular Directory:

Output as per new file name:

If interest or Need Unix Shell Script or guidance on How to Rename files even any no. of files present in particular directory (including more than thousands of files).

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Need Code on Calculate Age of the person based on Date of Birth using Unix Shell Script ( Charges are applicable )

Consider an input or input file with information about a person name and his/her date of birth. Generate an output or output file with same person name and his/her age. 

Example: 

User Friendly Provided Person Name and Date of birth.

Output based on Person Name and Age.

Or Based on Input file:

Output:

If interest or Need Unix Shell Script or guidance on How to Calculate Age of the person based on Date of Birth provided as input.

Please comment or connect me or message me  in Linkedin ( https://www.linkedin.com/in/jigna-n-mer-7400891b0/) or mail me (jigna.mer@gmail.com) (Charges are applicable)

Need Code on Masking the letter in a word from the input file using Unix Shell Script ( Charges are applicable )

Masking the letter in a word from the input file. Consider an input file consisting of bunch of words in a new line with word length ranging between 2 and above. Write a code to mask all the letters after first four letters in each word with # symbol as shown in example below.

Example: 

Input: ISSStudentsAreBest

Output: ISSS##############

Input File (input.txt)

After Executing Script.

Output File (output.txt)

If interest or Need Unix Shell Script or guidance on Masking the letter after fourth letters based on input file as shown above. 

Please comment or connect me or message me  in Linkedin ( https://www.linkedin.com/in/jigna-n-mer-7400891b0/) or mail me (jigna.mer@gmail.com) (Charges are applicable)