$1
<programming> The first positional parameter in shell programming and
related languages. Occurrences of $1 are replaced by the first actual argument
provided by the user when the shell script is run. $2 is replaced by the second
argument, and so on up to $9.
You may have arrived at this entry by following a URL like
"http://foldoc.org?$1", which is actually a template used to generate pointers
to FOLDOC definitions by replacing "$1" with the term to be defined, e.g. in a
wiki interwiki map.
(2006-09-10)
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