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getcol.icn
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2002-03-26
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54 lines
############################################################################
#
# File: getcol.icn
#
# Subject: Program to extract column from data
#
# Author: Ralph E. Griswold
#
# Date: March 26, 2002
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program extracts a column from multi-column data.
#
# The supported options are:
#
# -n i column number, default 1
# -c s column-separation characters, default ' \t'
#
############################################################################
#
# Links: options
#
############################################################################
link options
procedure main(args)
local i, chars, col, line, opts
opts := options(args, "n+c:")
i := \opts["n"] | 1
if i < 1 then stop("*** invalid column specifications")
chars := cset(\opts["c"]) | ' \t'
if *chars = 0 then stop("*** invalid character-separation specification")
while line := read() do {
line ? {
every 1 to i - 1 do {
tab(upto(chars)) | stop("*** column missing")
tab(many(chars))
}
write(tab(upto(chars) | 0))
}
}
end