Decrypt pdf on command-line

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Decrypt pdf on command-line

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Last edited Feb 10, 2013

Created on Dec 15, 2017

This example shows how to decrypt a password-protected PDF file directly from the command line using the `qpdf` tool. The code first presents a one-line command that applies a known password with the `--decrypt` flag, converting `orig.pdf` into `decrypted.pdf`. It then demonstrates an interactive variant that uses the shell’s `read` built-in with the `-s` flag to silently prompt for a password, storing it in a variable and passing it to `qpdf` via command substitution. The rendering approach is purely textual, relying on standard shell syntax rather than any graphics or visualization library.

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