RWARRAY(3am) GNU Awk Extension Modules RWARRAY(3am)
writea, reada - write and read gawk arrays to/from files
ret = writea(file, array)
ret = reada(file, array)
The rwarray extension adds two functions named writea(). and reada(),
This function takes a string argument, which is the name of the
file to which dump the array, and the array itself as the second
argument. writea() understands multidimensional arrays. It re-
turns one on success, or zero upon failure.
is the inverse of writea(); it reads the file named as its first
argument, filling in the array named as the second argument. It
clears the array first. Here too, the return value is one on
success and zero upon failure.
The array created by reada() is identical to that written by writea()
in the sense that the contents are the same. However, due to implemen-
tation issues, the array traversal order of the recreated array will
likely be different from that of the original array. As array traver-
sal order in AWK is by default undefined, this is not (technically) a
problem. If you need to guarantee a particular traversal order, use
the array sorting features in gawk to do so.
The file contains binary data. All integral values are written in net-
work byte order. However, double precision floating-point values are
written as native binary data. Thus, arrays containing only string
data can theoretically be dumped on systems with one byte order and re-
stored on systems with a different one, but this has not been tried.
ret = writea("arraydump.bin", array)
ret = reada("arraydump.bin", array)
GAWK: Effective AWK Programming, filefuncs(3am), fnmatch(3am),
fork(3am), inplace(3am), ordchr(3am), readdir(3am), readfile(3am),
Arnold Robbins, email@example.com.
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Free Software Foundation Feb 02 2018 RWARRAY(3am)
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