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I have the following code snippet

for num
   echo $num

But I don't understand why it works! How come does Bash know to loop through my params $1, $2, $3, $... using my personal taste of "num" variable???

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up vote 13 down vote accepted

It's a feature of bash:

for num; do ...

is a shorthand for

for num in "$@"; do ...

The documentation is at

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