sed用数字1替换数字 [英] sed replace number with number-1
问题描述
sed是否可以处理替换并同时评估表达式以某种方式替换?
Can sed handle a substitution and simultaneously evaluate an expression to substitute somehow?
例如,我在文本文件中有以下条目:
For example, I have the following entry in a text file:
##################################### topd Tree1 - Tree14 #######################################
出于我不愿讨论的原因,相对于到目前为止我一直在使用的另一种编号方案,每棵树的编号为N + 1.
For reasons I won't go in to, each Tree's number is N+1 relative to another numbering scheme I've been using so far.
可以sed(或真的任何util,sed只是我进行查找和替换操作的地方),找到 TreeN
的每个实例,然后将它们替换为 TreeN-1 代码>,使上面的行看起来像这样:
Could sed (or any util really, sed is just my go to for find-and-replace operations), find every instance of TreeN
and replace them with TreeN-1
such that the above line would then look like:
##################################### topd Tree0 - Tree13 #######################################
(使用Ubuntu 12.02,几乎可以进行所有操作.)
(Using Ubuntu 12.02, so pretty much anything goes.)
推荐答案
使用perl
perl -pe 's/Tree\K\d+/$&-1/ge' file
输出
##################################### topd Tree0 - Tree13 #######################################
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