122 lines
2.4 KiB
Text
122 lines
2.4 KiB
Text
#
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# Chet Ramey <chet.ramey@case.edu>
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#
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# Copyright 1999 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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# usage: reverse arrayname
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reverse()
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{
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local -a R
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local -i i
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local rlen temp
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# make r a copy of the array whose name is passed as an arg
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eval R=\( \"\$\{$1\[@\]\}\" \)
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# reverse R
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rlen=${#R[@]}
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for ((i=0; i < rlen/2; i++ ))
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do
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temp=${R[i]}
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R[i]=${R[rlen-i-1]}
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R[rlen-i-1]=$temp
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done
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# and assign R back to array whose name is passed as an arg
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eval $1=\( \"\$\{R\[@\]\}\" \)
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}
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A=(1 2 3 4 5 6 7)
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echo "${A[@]}"
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reverse A
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echo "${A[@]}"
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reverse A
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echo "${A[@]}"
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# unset last element of A
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alen=${#A[@]}
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unset A[$alen-1]
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echo "${A[@]}"
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# ashift -- like shift, but for arrays
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ashift()
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{
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local -a R
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local n
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case $# in
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1) n=1 ;;
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2) n=$2 ;;
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*) echo "$FUNCNAME: usage: $FUNCNAME array [count]" >&2
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exit 2;;
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esac
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# make r a copy of the array whose name is passed as an arg
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eval R=\( \"\$\{$1\[@\]\}\" \)
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# shift R
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R=( "${R[@]:$n}" )
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# and assign R back to array whose name is passed as an arg
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eval $1=\( \"\$\{R\[@\]\}\" \)
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}
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ashift A 2
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echo "${A[@]}"
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ashift A
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echo "${A[@]}"
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ashift A 7
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echo "${A[@]}"
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# Sort the members of the array whose name is passed as the first non-option
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# arg. If -u is the first arg, remove duplicate array members.
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array_sort()
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{
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local -a R
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local u
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case "$1" in
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-u) u=-u ; shift ;;
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esac
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if [ $# -eq 0 ]; then
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echo "array_sort: argument expected" >&2
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return 1
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fi
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# make r a copy of the array whose name is passed as an arg
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eval R=\( \"\$\{$1\[@\]\}\" \)
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# sort R
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R=( $( printf "%s\n" "${A[@]}" | sort $u) )
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# and assign R back to array whose name is passed as an arg
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eval $1=\( \"\$\{R\[@\]\}\" \)
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return 0
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}
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A=(3 1 4 1 5 9 2 6 5 3 2)
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array_sort A
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echo "${A[@]}"
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A=(3 1 4 1 5 9 2 6 5 3 2)
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array_sort -u A
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echo "${A[@]}"
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