Web Reference: In your case, assuming that blah doesn't start with a - or contain % or \, the only difference between the two commands is that echo adds a newline and printf doesn't. Dec 27, 2025 · Use printf in scripts, logs, and anywhere output format matters. If you ever find yourself relying on echo options or escape sequences, that’s usually a sign that printf is the better tool. Oct 29, 2017 · Use printf when you rely on the precise output. Although the echo man page is relevant in so far as the bash built-in certainly was carefully crafted to perfectly emulate the program's behavior, /bin/echo, which the man page documents, is never executed in the OP's example.
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