http://bash.cyberciti.biz/file-management/shell-script-to-simulate-unix-more-command/
#!/bin/bash
# Write a shell script like a more command. It asks the user name, the
# name of the file on command prompt and displays only the 15 lines of
# the file at a time.
# -------------------------------------------------------------------------
# Copyright (c) 2007 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
counter=1
echo -n "Enter a file name : "
read file
if [ ! -f $file ]
then
echo "$file not a file!"
exit 1
fi
# read file line by line
exec 3<&0
while read line
do
# pause at line no. 15
if [ $counter -eq 15 ]
then
counter=0 # reset counter
echo " *** Press [Enter] key to continue ..."
read -u 3 enterKey
fi
echo $line
(( counter++ ))
done < $file
这会模拟更多命令.. 我收到这个错误..
阅读:26:非法选项-u
确保输入超过15行的文件名称。 另外我读了“阅读”的手册页,我没有得到像“-u”这样的选项..
那么,我如何使用文件描述符3(stdin的副本)中的“read”读取。
答案 0 :(得分:12)
试
read key <&3
答案 1 :(得分:9)
也可以让bash为变量分配文件描述符; 下一个空闲描述符号将从10开始分配。 例如:
#!/bin/bash
FILENAME="my_file.txt"
exec {FD}<${FILENAME} # open file for read, assign descriptor
echo "Opened ${FILENAME} for read using descriptor ${FD}"
while read -u ${FD} LINE
do
# do something with ${LINE}
echo ${LINE}
done
exec {FD}<&- # close file
答案 2 :(得分:0)
仅供记录,这是另一个脚本:
# Author: Steve Stock
# http://www.linuxjournal.com/article/7385 (comments)
shmore() {
LINES=""
while read -d $'\n' line; do
printf "%s\n" "$line"
#echo "$line"
LINES=".${LINES}"
if [[ "$LINES" == "......................." ]]; then
echo -n "--More--"
read < /dev/tty
LINES=""
fi
done
return 0
}
shmore < file.txt