http://bash.cyberciti.biz/file-management/shell-script-to-simulate-unix-more-command/如何在bash腳本中使用文件描述符3中的「讀取」來讀取?
#!/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
這模擬多個命令.. 我得到這個錯誤..
讀:26:-u
非法選項確保輸入的名稱一個文件有超過15行.. 此外我讀了「閱讀」的手冊頁,我沒有得到像「-u」的選項..
那麼,我如何閱讀使用「讀取」從文件描述符3(這是stdin的副本)。
什麼的Bash版本: 接下來的空閒描述符數量將從10 例如開始進行分配? – 2010-01-18 16:18:40