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Shell 递归程序设计-目录列表 |
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UNIX Shell 脚本类似 DOS 的批处理命令,但比较起来 UNIX Shell 的功能更强大,在某些方面,Shell 甚至超过了一些高级语言。 下边的 Shell 脚本演示了如何用 Shell 脚本编写递归程序。
运行前先执行下述准备命令: ln tree.sh /usr/bin/tree ln tree.sh /usr/bin/wtree ln tree.sh /usr/bin/dtree 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)
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