Usage of grep '^$1' filename

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Quote:

Originally Posted by RudiC

$1 in shell is the first positional parameter, either supplied when calling the script or function, or (in bash) set by set -- text1 text2 . . ..

Code:

set -- arg...

isn't just available in bash; it is required in all POSIX-conforming shells.

Note that the -- is only required if the 1st arg starts with a - or + character or if you want to use the command:

Code:

set --

to unset all positional parameters.

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