No v príkazovom riadku ti to asi nepíše (skôr v stavovom), nuž a zálohovanie sa väčšinou robí tak, že si zoberieš nejaký súbor, ktorý sa chystáš upravovať, pred jeho úpravou ho uložíš na iné miesto, pôvodný súbor upravíš a uvidíš, čo sa bude diať, keď sa tvoje zmeny prejavia v praxi.
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A. S. Tanenbaum píše: The terms LF, MF, and HF refer to low, medium, and high frequency, respectively. Clearly, when the names were assigned, nobody expected to go above 10 MHz, so the higher bands were later named the Very, Ultra, Super, Extremely, and Tremendously High Frequency bands. Beyond that there are no names, but Incredibly, Astonishingly, and Prodigiously high frequency (IHF, AHF, and PHF) would sound nice. | 
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