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藍森林 http://www.lslnet.com 2006年8月08日 13:08
 如何用 Shell 腳本編寫遞歸程序
埄埄UNIX Shell 腳本類似 DOS 的批處理命令，但比較起來 UNIX Shell 的功能更強大，在某些方面，Shell 甚至超過了一些高級語言。
埄埄下邊的 Shell 腳本演示了如何用 Shell 腳本編寫遞歸程序。
埄埄運行前先執行下述準備命令：
埄埄ln tree.sh /usr/bin/tree
埄埄ln tree.sh /usr/bin/wtree
埄埄ln tree.sh /usr/bin/dtree
埄埄rm tree.sh
# tree.sh
# Depth first Directory list
dtree() {
PWD=`pwd|sed 's/\/\$//`
for d in $*
do
echo "${PWD}/$d"
[ -d "$d" -a -x "$d" ] && {
cd "$d"
dtree *
cd ..
PWD=`pwd|sed 's/\/\$//` # restore PWD
}
done
}
# Depth first Directory list
wtree() {
PWD=`pwd|sed 's/\/\$//`
for d in $*
do
echo ${PWD}/$d
done
for d in $*
do
[ -d "$d" -a -x "$d" ] && {
cd $d
wtree *
cd ..
}
done
}
# Directory list
tree() {
PWD=`pwd|sed 's/\/\$//`
for d in $*
do
echo ${PWD}/$d
done
}
# main
TREE=`basename $0`
if [ "$1" ]
then DIR="$1"
else DIR="."
fi
if cd $DIR
then $TREE *
else echo "$0: Directory $1 read fail."
fi
# (End)
[b][/b] :em11: :em11: :em11: :em11: :em11: :em11: |
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