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I am looking for a bash script which input is the old and the new password for changing password of a *.gpg file.

I encrypted a txt file with command gpg -c. System create a file.txt.gpg. How can I change the passphrase that I created before?

  • You encrypt a file if you do gpg -c, I assumed that was a typo and corrected it. – Anthon Apr 25 '16 at 5:01
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You cannot change the passphrase, but you can decrypt and reencrypt:

gpg --decrypt file.txt.gpg | (gpg -c > tmp.gpg && mv tmp.gpg file.txt.gpg)

You shouldn't directly redirect to your encrypted file (it still needs to be decrypted) and the && make sure the mv is not executed unless the encryption succeeded.

The above will prompt you once for your decryption password and then twice for the encryption.

  • thanks, that help a lot. I wonder if you correct this code for me {basename \home\hieu\test.txt.gpg}::-4 I want to delete 4 character of the string which is test.txt.gpg Thanks alredy! – H.Dinh Apr 25 '16 at 5:59
  • @H.Dinh If you are using Bash, try x="\home\hieu\test.txt.gpg" and then echo ${x%.gpg}. That is much better than mucking with basename (which you would have to put in between $( )) – Anthon Apr 25 '16 at 7:29

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