Question

This is unix tools and scripting. For all of these questions, you may NOT use: grep, sed, awk, or per if, for, while, until, case, or read.

For each of the following commands, state:
   i) which program opens and reads the input file, and
   ii) how shasum receives the file's contents.

   a)   shasum Meditations.txt
       i)
       ii)
   b)   cat Meditations.txt | shasum
       i)
       ii)
   c)    shasum < Meditations.txt
       i)
       ii)

Your efforts are appreciated. Thank you very much !

*update* example about shasum in following :

Give a command to replace all of the capital X characters with lower case x characters in the books corpus. [e]

   cat * | tr 'X' 'x' | shasum
   e424cc5e4fae61474f7a7622b2daeb2340999602 -

Answer 1

a) shasum Meditations.txt

-> This command will read the file in text mode and print the SHA checksums

-> This command will print the file name along with the checksums. Format: [ checksum   filename ]

b) cat Meditations.txt | shasum

-> This command will read the content of the file using cat command and print the SHA checksums of the file content

-> This command does not print the filename along with the checksums. Format: [ checksum   - ]

c) shasum < Meditations.txt

-> This command will also print the SHA checksums of the file contents

-> This command does not print the filename along with the checksums. Format: [ checksum   - ]

Replace all of the capital X characters with lower case x characters.

-> cat book_corpus.txt | tr 'X' 'x' | shasum

Here the book is saved as a file in book_corpus.txt