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My requirement is to encrypt/decrypt a tcl file without a openssl password prompt, but read the password automatically from a file. my test_en.tcl has the following encrypt/decrypt commands:

exec openssl enc -aes-256-cbc -in  test_en.tcl -out encrpt_test_en.tcl
exec openssl enc -aes-256-cbc -d -in encrpt_test_en.tcl > new_test_en.tcl

How can I read the password from a file into tcl script and avoid manual entry to encrypt/decrypt the file automatically?

Please suggest correct way to send the password to tcl script.

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From man openssl , you can see that enc have the option -kfile .

   -kfile file
             Read the password to derive the key from the first line of file.  Superseded by the -pass option.
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