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

请考虑以下内容：

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，不环境变量，因此不会导出到子进程（但它们会自动更新当我调整xterm窗口大小时，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?

编辑：
我需要这个作为一种解决方法做一个 $ LINES 线肯定不是完美的解决方案，但至少比失去

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 ：

#!/bin/bash

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

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

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