Question

我试图将某些命令的输出限制到终端宽度的末尾。如果超过终端尺寸，则将超出的字符加上几个以上的点。

我无法固定解决方案，只是长时间待在身边。这是一个例子：

echo $x
this is a sample string and this does not mean anything this is to feed length

echo $x |awk '{print length($0)}' #Here terminal size is greater then line's length. 
78

终端尺寸：

tput cols
168

但是，如果我有一个较小的窗口：

tput cols
74

然后$x的内容将分为两行，我希望多余的字符被清除掉。

因此，如果终端大小为74，则$x应打印为：

echo $x
this is a sample string and this does not mean anything this is to feed ..

我正在考虑实施，但我现在迷失了。

echo $x |awk --posix  -v c=$(tput cols) '{l=length($0);if(l>c) {difference=l-c ;gsub(/.\{difference\}$/,"",$0);print $0}else print  $0}'
this is a sample string and this does not mean anything this is to feed length

Answer 1

这样的事情？

  ... | awk -v t=$(tput cols) '{if(length($0)>t) print substr($0,1,t-4) "...";
                                else print}'

Answer 2

代码中的错误解释

echo $x \
| awk --posix  -v c=$(tput cols) '
    {
    l = length($0)
    if( l > c ) { 
       # difference = l - c 

       # variable difference is not interpretated in regex format
       # $0 is the default variable of (g)sub
       # gsub(/.\{difference\}$/,"",$0)
       # gsub( ".{" difference "}$","", $0)
       sub( ".{" ( l - c + 3 ) "}$","...")

       # print $0
       }
    # else print  $0
    }

    #print
    7
    '

Answer 3

您也可以在简单的作业中使用karakfa的想法：

... | awk -v c=$(tput cols) '$0 = length > c ? substr($0,1,c-4) : $0'

如果终端的长度小于使用awk的终端的宽度，则将最后N个字符转换为点

3 个答案: