LINES 和 COLUMNS 环境变量在脚本中丢失 [英] LINES and COLUMNS environmental variables lost in a script

问题描述

考虑以下事项:

me@mine:~$ cat a.sh 
#!/bin/bash
echo "Lines: " $LINES
echo "Columns: " $COLUMNS
me@mine:~$ ./a.sh 
Lines: 
Columns: 
me@mine:~$ echo "Lines: " $LINES
Lines:  52
me@mine:~$ echo "Columns: " $COLUMNS
Columns:  157
me@mine:~$ 

变量$LINES 和$COLUMNS 是shell 变量，不是 环境变量，因此不会导出到子进程(但是当我调整 xterm 窗口的大小时，它们会自动更新，即使从远程位置通过 ssh 登录).有没有办法让我的脚本知道当前的终端大小?

The variables $LINES and $COLUMNS are shell variables, not environmental variables, and thus are not exported to the child process (but they are automatically updated when I resize the xterm window, even when logged in via ssh from a remote location). Is there a way in which I can let my script know the current terminal size?

我需要这个作为解决方法来解决这个问题:vi(以及 vim、less 和类似命令)每次使用时都会弄乱屏幕.更改终端不是一种选择，因此我正在寻找解决方法(向下滚动 $LINES 行肯定不是完美的解决方案，但至少比丢失前一个屏幕要好)

I need this as a workaround do this problem: vi (as well as vim, less, and similar commands) messes up the screen every time I use it. Changing the terminal is not an option, and thus I'm looking for workarounds (scrolling down $LINES lines surely is not the perfect solution, but at least is better than losing the previous screen)

推荐答案

您可以从 tput 获取行和列:

You could get the lines and columns from tput:

#!/bin/bash

lines=$(tput lines)
columns=$(tput cols)

echo "Lines: " $lines
echo "Columns: " $columns

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