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Home/ Questions/Q 9191841
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Editorial Team
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Editorial Team
Asked: June 17, 20262026-06-17T20:47:02+00:00 2026-06-17T20:47:02+00:00

today i found the ‘bc’ linux command and found a strange behaviour when calculating

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today i found the ‘bc’ linux command and found a strange behaviour when calculating with outputbase 10.

echo "ibase=16;obase=9;AFBE" | bc
67638

echo "ibase=16;obase=11;AFBE" | bc
09 02 11 08

echo "ibase=16;obase=10;AFBE" | bc
AFBE

well, command 1 and 2 are correct, but the third command simply prints the inputvalue.

echo "ibase=16;AFBE" | bc
44990

gives a correct result.

Is there any reason in this behaviour?

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  1. Editorial Team
    Editorial Team
    2026-06-17T20:47:03+00:00Added an answer on June 17, 2026 at 8:47 pm

    You’re not the first person to be caught by this.
    Apparently you need to set obase before ibase:

    echo "obase=10;ibase=16;AFBE" | bc
    44990
    
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