紧急求助，字符串处理的问题：过滤文本中特定字符串的行，并对每行数据进行处理

tcpipstack

向达人求助，字符串处理的问题：过滤文本中特定字符串的行，并对每行数据进行处理

第一次发帖，也没认真看发帖规范，如果有不符合规范的地方求版主多多包涵，谢谢啦！

最近要完成一个问题：

下面是一个文本文件的内容：

1. #LCM_HEIGHT = 480
   
2. #BOOT_LOGO = hvga
   
3. #else /* VENDOR_EDIT */
   
4. CUSTOM_UBOOT_LCM = Hitachi_Qhd_TX11D105VM
   
5. #endif /*VENDOR_EDIT*/
   
6. DEFAULT_INPUT_METHOD=com.sohu.inputmethod.sogou.SogouIME
   
7. DEFAULT_LATIN_IME_LANGUAGES=en_US
   
8. EVB=no
   
9. GEMINI=yes
   
10. GOOGLE_RELEASE_RIL=no
    
11. HAVE_AACENCODE_FEATURE=yes
    
12. HAVE_AEE_FEATURE=yes
    
13. HAVE_APPC_FEATURE=no
    
14. HAVE_AWBENCODE_FEATURE=yes
    
15. HAVE_CMMB_FEATURE=no
    
16. HAVE_GROUP_SCHEDULING=no

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我需要从这个文本中把 = 后面为 yes/YES no/NO 的行内容提取出来，并对每行数据进行处理，
截取等号之前的字符串，转成小写，并输出到另外一个文件中，

故紧急向达人求助！

谢谢啦！

tcpipstack

求达人帮忙

kk5234

1. sed -n '/yes\|YES\|no\|NO/s/\([^=]\+\).*/\L\1/p' file

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jason680

回复 1# tcpipstack

How about this

$ echo 'abc=efg
EVB=no
GMINI=yes' | awk -F= -vIGNORECASE=1 '$2~/YES|NO/{print tolower($1)}'
evb
gmini
   

yestreenstars

1. awk '/=yes|=YES|=no|=NO/{print tolower(substr($0,1,index($0,"=")-1))}' urfile > outfile

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yestreenstars

@kk5234请问kk兄，\L这种用法的出处？man sed里貌似找不到。

kk5234

回复 6# yestreenstars

具体的可以看一下 info sed

The `s' Command
===============

   The syntax of the `s' (as in substitute) command is
`s/REGEXP/REPLACEMENT/FLAGS'.  The `/' characters may be uniformly
replaced by any other single character within any given `s' command.
The `/' character (or whatever other character is used in its stead)
can appear in the REGEXP or REPLACEMENT only if it is preceded by a `\'
character.

   The `s' command is probably the most important in `sed' and has a
lot of different options.  Its basic concept is simple: the `s' command
attempts to match the pattern space against the supplied REGEXP; if the
match is successful, then that portion of the pattern space which was
matched is replaced with REPLACEMENT.

   The REPLACEMENT can contain `\N' (N being a number from 1 to 9,
inclusive) references, which refer to the portion of the match which is
contained between the Nth `\(' and its matching `\)'.  Also, the
REPLACEMENT can contain unescaped `&' characters which reference the
whole matched portion of the pattern space.  Finally, as a GNU `sed'
extension, you can include a special sequence made of a backslash and
one of the letters `L', `l', `U', `u', or `E'.  The meaning is as
follows:

`\L'
     Turn the replacement to lowercase until a `\U' or `\E' is found,

`\l'
     Turn the next character to lowercase,

`\U'
     Turn the replacement to uppercase until a `\L' or `\E' is found,

`\u'
     Turn the next character to uppercase,

`\E'
     Stop case conversion started by `\L' or `\U'.

yestreenstars

回复 7# kk5234


    谢谢！

reyleon

1. sed -rn '/([Yy][Ee][Ss])|([Nn][Oo])$/s/([^=]+).*/\L\1/p'  urflie

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学了个"\L"   

kernel69

sed -n  '/.*\=\(yes\|YES\|NO\|no\)$/{s#\(.*\)#\L\1#p}' t