AWK - 更改第二个日期

Question

我有一个文件:

pablo tty8 Thu Nov 1 12:51:21 2012 still logged in 
(unknown tty8 Thu Nov 1 12:50:57 2012 - Thu Nov 1 12:51:21 2012 (00:00) 
pablo tty2 Thu Nov 1 12:50:39 2012 still logged in 
pablo tty7 Thu Nov 1 12:49:45 2012 - Thu Nov 1 12:50:56 2012 (00:01) 
(unknown tty7 Thu Nov 1 12:34:32 2012 - Thu Nov 1 12:49:45 2012 (00:15)

我想在上面的日期替换文件一秒钟.我要打印:

pablo tty8 1351770681 still logged in 
(unknown tty8 1351770657 - 1351770681 (00:00) 
pablo tty2 1351770639 still logged in 
pablo tty7 1351770585 - 1351770656 (00:01) 
(unknown tty7 1351769672 - 1351770585 (00:15)

我试过这个命令:

gawk --posix 'function my()
{"date -d \047"$0"\047 +%s" | getline b; 
gsub( /[A-Za-z]{3} [A-Za-z]{3} [0-9] ([0-9]{2}:){2}[0-9]{2} [0-9]{4}/,b ); print}
{ my() }' file

以上命令不起作用:

$ gawk --posix 'function my()
> {"date -d \047"$0"\047 +%s" | getline b; 
> gsub( /[A-Za-z]{3} [A-Za-z]{3} [0-9] ([0-9]{2}:){2}[0-9]{2} [0-9]{4}/,b ); print}
> { my() }' ta
date: b??dna data: `pablo tty8 Thu Nov 1 12:51:21 2012 still logged in '
pablo tty8  still logged in 
(unknown tty8 1351897200 - 1351897200 (00:00) 
date: b??dna data: `pablo tty2 Thu Nov 1 12:50:39 2012 still logged in '
pablo tty2 1351897200 still logged in 
date: b??dna data: `pablo tty7 Thu Nov 1 12:49:45 2012 - Thu Nov 1 12:50:56 2012 (00:01) '
pablo tty7 1351897200 - 1351897200 (00:01) 
(unknown tty7 1351897200 - 1351897200 (00:15)

如何改进上述命令？

谢谢您的帮助.

Answer 1

如果已vim安装,请尝试以下命令:

:%s/\v\w+\s\w+\s\d+\s\d+:\d+:\d+\s\d+/\=system('date +%s -d"'.submatch(0).'" | tr -d "\n"')/g

这个想法非常简单.vim可以很快.