bash 如何在bash中显示和刷新多行
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How to display and refresh multiple lines in bash
提问by user2704404
I am writing a installation script and would like to display the status of the script as it progresses.
我正在编写一个安装脚本，并希望随着脚本的进展显示该脚本的状态。
example:
例子：
var1="pending"
var2="pending"
var3="pending"
print_status () {
echo "Status of Item 1 is: "$var1""
echo "Status of Item 2 is: "$var2""
echo "Status of Item 3 is: "$var3""
}
code that does something and then refreshes the
output above as the status of each variable changes.
回答by Aleks-Daniel Jakimenko-A.
This code should give you the idea:
这段代码应该给你的想法：
while :; do
echo "$RANDOM"
echo "$RANDOM"
echo "$RANDOM"
sleep 0.2
tput cuu1 # move cursor up by one line
tput el # clear the line
tput cuu1
tput el
tput cuu1
tput el
done
Use man tputfor more info. To see the list of capabilities use man terminfo
使用man tput以获取更多信息。要查看功能列表，请使用man terminfo
回答by Woody Huang
I find another solution which is not mentioned in existing answers. I am developing program for openwrt, and tputis not available by default. The solution below is inspired by Missing tputand Cursor Movement.
我找到了现有答案中未提及的另一种解决方案。我正在为 openwrt 开发程序，tput默认情况下不可用。下面的解决方案受到Missing tput和Cursor Movement 的启发。
- Position the Cursor:
3[<L>;<C>H
Or
3[<L>;<C>f
puts the cursor at line L and column C.
- Move the cursor up N lines:
3[<N>A
- Move the cursor down N lines:
3[<N>B
- Move the cursor forward N columns:
3[<N>C
- Move the cursor backward N columns:
3[<N>D
- Clear the screen, move to (0,0):
3[2J
- Erase to end of line:
3[K
- Save cursor position:
3[s
- Restore cursor position:
3[u
As for your question:
至于你的问题：
var1="pending"
var2="pending"
var3="pending"
print_status () {
# add 3[K to truncate this line
echo "Status of Item 1 is: "$var1"3[K"
echo "Status of Item 2 is: "$var2"3[K"
echo "Status of Item 3 is: "$var3"3[K"
}
while true; do
print_status
sleep 1
printf "3[3A" # Move cursor up by three line
done
回答by rook
Look at this:
看这个：
while true; do echo -ne "`date`\r"; done
and this:
和这个：
declare arr=(
">...."
".>..."
"..>.."
"...>."
"....>"
)
for i in ${arr[@]}
do
echo -ne "${i}\r"
sleep 0.1
done
回答by Fabio A. Correa
This does not completely solve your problem but might help; to print the status after the execution of each command, modify PS1 like this:
这并不能完全解决您的问题，但可能会有所帮助；要打印每个命令执行后的状态，请像这样修改 PS1：
PS1='$PS1 $( print_status )'
回答by seanmcl
You can use the carriage return to change text on a single status line.
您可以使用回车来更改单个状态行上的文本。
n=0
while true; do
echo -n -e "n: $n\r"
sleep 1
n=$((n+1))
done
If you can put all your counters on one line
如果你能把所有的计数器放在一条线上
n=0
m=100
while true; do
echo -n -e "n: $n m: $m\r"
sleep 1
n=$((n+1))
m=$((m-1))
done
This technique doesn't seem to scale to multiple lines, though it does have the benefit over tput that it works on dumb terminals (like Emacs shell).
这种技术似乎不能扩展到多行，尽管它确实比 tput 有优势，因为它适用于哑终端（如 Emacs shell）。
