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I have a file that is decrypted with a similar command:

gpg --batch --yes -q -d --passphrase-fd 0 -o "/var/file.out" "/var/file.gpg" < /var/secret.key 

I want to change the content of the /var/file.gpg but the decryption should continue work as before. Any idea how to encrypt it (I was able to find some examples with pass phrases (which I suppose is what the key file is used for) and sender and receiver (which I suppose I don't need) and it was not working so far)

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Ok. I've found what I needed:

passphrase=$(head -n 1 /var/secret.key)
gpg --symmetric --batch --yes --passphrase $passphrase --output some.gpg  toEncrypt.txt

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