如何忽略所有线路在bash发生在比赛前？ [英] How to ignore all lines before a match occurs in bash?

问题描述

我想忽略在bash在比赛前发生的所有线路（也忽略匹配线的输入的例子是

  R1-01.sql
R1-02.sql
R1-03.sql
R1-04.sql
R2-01.sql
R2-02.sql
R2-03.sql
 

如果我符合 R2-01.sql 在这个已经排序输入我想获得

  R2-02.sql
R2-03.sql
 

解决方案

方法很多可能的。例如：假设你的输入是LIST.TXT

  PATTERN =R2-01.sql
sed的0 / $ PATTERN / D＆LT; LIST.TXT
 

因为，在 0，/模式/ 只适用于GNU sed的，（例如不能在OS X的作品），这里是一个的篡改解决方案。 ;）

  PATTERN =R2-01.sql
（回声伪线至所述起动;猫 - ）下; LIST.TXT | sed的1 / $ PATTERN / D
 

这将一个虚拟的行添加到开始，所以真正的模式必须上线1或更高，因此 1，/模式/ 将作品 - 删除一切从第1行（虚设的）到图案

或者可以将图案打印后线和删除第一，如：

  SED -n'/模式/，$ P'＆LT; LIST.TXT | SED1D
 

使用awk，例如：

 的awk'/模式/，0 {如果（/模式/！）打印}'＆LT; LIST.TXT
 

或我最喜欢的使用下一个Perl的命令：

 的perl -ne'打印除非1 ../模式/'＆LT; LIST.TXT
 

删除1.st线时，该模式是在一号线...

另一种解决方案是反删除，反向

 尾-r＆LT; LIST.TXT | SED'/模式/，$ D'|尾-r
 

如果您有 TAC 命令用它来代替尾-r 的interesant事情比 /模式/，$ D'的作品就上线，但 1，/模式/ D`不会做第一个。

I would like ignore all lines which occur before a match in bash (also ignoring the matched line. Example of input could be

R1-01.sql
R1-02.sql
R1-03.sql
R1-04.sql
R2-01.sql 
R2-02.sql
R2-03.sql

and if I match R2-01.sql in this already sorted input I would like to get

R2-02.sql
R2-03.sql

解决方案

Many ways possible. For example: assuming that your input is in list.txt

PATTERN="R2-01.sql"
sed "0,/$PATTERN/d" <list.txt

because, the 0,/pattern/ works only on GNU sed, (e.g. doesn't works on OS X), here is an tampered solution. ;)

PATTERN="R2-01.sql"
(echo "dummy-line-to-the-start" ; cat - ) < list.txt | sed "1,/$PATTERN/d"

This will add one dummy line to the start, so the real pattern must be on line the 1 or higher, so the 1,/pattern/ will works - deleting everything from the line 1 (dummy one) up to the pattern.

Or you can print lines after the pattern and delete the 1st, like:

sed -n '/pattern/,$p' < list.txt | sed '1d'

with awk, e.g.:

awk '/pattern/,0{if (!/pattern/)print}' < list.txt

or, my favorite use the next perl command:

perl -ne 'print unless 1../pattern/' < list.txt

deletes the 1.st line when the pattern is on 1st line...

another solution is reverse-delete-reverse

tail -r < list.txt | sed '/pattern/,$d' | tail -r

if you have the tac command use it instead of tail -r The interesant thing is than the /pattern/,$d' works on the last line but the1,/pattern/d` doesn't on the first.

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