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git-hash-object:tldr:ced42
This command is used to calculate and display the hash value (SHA-1) for the content of a file in Git.
Here's how it works step-by-step:
-
cat ${filename}
: This part uses thecat
command to read and display the contents of the file whose name is stored in the${filename}
variable. Thecat
command is used to concatenate and display file contents in Unix-like systems. -
|
: This pipe character acts as a redirection operator, sending the output of the previous command (cat ${filename}
) as input to the next command. -
git hash-object --stdin
: Thegit hash-object
command calculates the SHA-1 hash value for the provided input. In this case,--stdin
tells Git to read the input from the standard input stream, which is coming from the previous command through the pipe.
When the command is executed, the file contents are read by cat
, piped to git hash-object
, and then Git calculates and displays the unique SHA-1 hash value for that file's content.