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users/13239: add some comments to mapfile doc

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Peter Stephenson 2008-09-18 10:55:43 +00:00
parent e4d3ee06b3
commit d3e90df780
2 changed files with 8 additions and 3 deletions
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9
Doc/Zsh/mod_mapfile.yo
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@ -25,15 +25,18 @@ every file in the current directory without the usual `tt(rm *)' test.
The parameter tt(mapfile) may be made read-only; in that case, files
referenced may not be written or deleted.
A file may conveniently be read into an array as one line per element
with the form `var(array)tt(=LPAR()${(f)mapfile[)var(filename)tt(]RPAR())'.
)
enditem()
subsect(Limitations)
Although reading and writing of the file in question is efficiently
handled, zsh's internal memory management may be arbitrarily baroque. Thus
it should not automatically be assumed that use of tt(mapfile) represents a
gain in efficiency over use of other mechanisms. Note in particular that
handled, zsh's internal memory management may be arbitrarily baroque;
however, tt(mapfile) is usually very much more efficient than
anything involving a loop. Note in particular that
the whole contents of the file will always reside physically in memory when
accessed (possibly multiple times, due to standard parameter substitution
operations). In particular, this means handling of sufficiently long files