56 lines
1.6 KiB
Text
56 lines
1.6 KiB
Text
#
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# Chet Ramey <chet.ramey@case.edu>
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#
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# Copyright 1998 Chester Ramey
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# TThis program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# Generate a sequence from m to n, m defaults to 1.
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seq ()
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{
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declare -i lo hi i # makes local
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local _SEQ INIT COMPARE STEP
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case "$1" in
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-r) INIT='i=$hi _SEQ=""' COMPARE='let "i >= $lo"' STEP='let i-=1' ; shift ;;
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*) INIT='i=$lo _SEQ=""' COMPARE='let "i <= $hi"' STEP='let i+=1' ;;
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esac
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case $# in
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1) lo=1 hi="$1" ;;
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2) lo=$1 hi=$2 ;;
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*) echo seq: usage: seq [-r] [low] high 1>&2 ; return 2 ;;
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esac
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# equivalent to the as-yet-unimplemented
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# for (( "$INIT" ; "$COMPARE" ; "$STEP" )); do _SEQ="${_SEQ}$i "; done
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eval "$INIT"
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while eval "$COMPARE"; do
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_SEQ="${_SEQ}$i "
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eval "$STEP"
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done
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echo "${_SEQ# }"
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return 0
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}
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# like the APL `iota' function (or at least how I remember it :-)
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iota()
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{
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case $# in
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1) seq 1 "$1"; return $?;;
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*) echo "iota: usage: iota high" 1>&2; return 2;;
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esac
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}
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