What does "2>&1" here mean?

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In the bash shell, what is “ 2>&1 ”?

#echo "[+] Creating $count files" 
_remount 
create=$((time ./dirtest $testdir $count $size) 2>&1) 

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It means that the standard error descriptor stderr (2) is to be redirected to the standard output descriptor stdout (1). Notice that the & ensures that the 1 is interpreted as a file descriptor and not a filename.

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It redirects standard error to the standard output. This way the result written to stderr will be stored in the variable.

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