shell script command --cut

 Option Description　　　　　　　　　　　　　　　　　　　　　　　　

cut command line dividing the specified delimiters into columns, its weakness is hard to deal with the case where a plurality of separators repeated, thus often combined tr compression feature.

-b: Byte screening;
-n: the "-b" option conjunction, that would prohibit bytes separated operate;
-c: Filter by character;
-f: by field screening;
-d: Specifies the field separator, the default field when not write separate -d Fu is "TAB"; and therefore only "-f" option is used with.
-s: Print lines that do not prevent delimiters;
--complement: complement selected byte, character or field (or reverse selection means is set up); :
--output-delimiterSpecifies the output delimiter; default delimiter input.

Assumed that the content shown in the following /tmp/abc.sh. Note: line 2 to line 5 of each column are not separated by a single space, and in some places repeated several spaces, in some places only one space, that is, the text is not very regular. And the last line is no box.

The following are examples of cut.

There are five fields in the abc.sh. The second screening field name column and the fourth column mark field. Spaces as a separator.

[root@localhost ~]# cut -d" " -f2,4 abc.sh
Name Mark
 001
 
 001
 
 
djakldj;lajd;sla

You can see, the output is a mess of unintended consequences. The reason is that the delimiter separated by a space where repeated many times. So you want to display the results correctly, you need to repeat a space to dispose of.

You can use tr tool to compress consecutive characters.

[root@localhost ~]# cat abc.sh | tr -s " " | cut -d " " -f2,4
Name Mark
longshuai 56
gaoxiaofang 60
zhangsan 50
lisi 80
wangwu 90
djakldj;lajd;sla

But output in the last row delimiter line is also no output, which requires the use -s to cancel such an output.

[root@localhost ~]# cat abc.sh | tr -s " " | cut -d" " -f2,4 -s
Name Mark
longshuai 56
gaoxiaofang 60
zhangsan 50
lisi 80
wangwu 90

Use --complement　　　　　　　　　　　　　　　　　　　　　　　　　　

In addition to the output of the second field and the fourth field in the rest of all the fields.

[the root @ localhost ~] # CAT . ABC SH | TR -s "  " | Cut -d "  " -f2, . 4 -s - complement 
NO subjectid Notes 
. 1  001 Fail
 2  001 pass
 . 3  001 fail
 . 4  001 pass
 5  001 pass

Byte or character segmentation　　　　　　　　　　　　　　　　　　　　　　　　　　　　

English and Arabic numerals are single-byte characters, Chinese double-byte characters, and even 3-byte characters.

-B bytes to use screened by using the -c character segmentation.

Note that when the division is not specified -d bytes or characters, as is divided -d field.

[root@localhost ~]# cut -b1-5 abc.sh 
NO Na
1  lo
2  ga
3  zh
4  li
5  wa
djakl

As the Chinese screening, the results appear garbled.

[root@localhost ~]# cut -b20 abc.sh  
a
6
 


 0

So "-b" option requires a combination of "-n" option to disable the "-b" option will force the split multi-byte characters cause garbled.

[root@localhost ~]# cut -n -b20 abc.sh
a
6
 
不
 
0

It can also be separated by character.

[root@localhost ~]# cut -c20 abc.sh    
a
6
 
不
 
0

Use --output-delimiter　　　　　　　　　　　　　　　　　　　　　　　　

Use "--output-delimiter" delimiter specified output.

When using the -b or -c separates the multi-stage character, you can use --output-delimiter, otherwise the multistage spliced ​​together.

[root@localhost ~]# cut -b3-5,6-8 abc.sh 
 Name 
 longs
 gaoxi
 zhang
 lisi 
 wangw
akldj;

[root@localhost ~]# cut -b3-5,6-8 abc.sh --output-delimiter "," 
 Na,me 
 lo,ngs
 ga,oxi
 zh,ang
 li,si 
 wa,ngw
akl,dj;

cut in the specified range　　　　　　　　　　　　　　　　　　　　　　　　　　　　

Can use "N -", "NM" and "-M" represent the content of each row of all N characters (or bytes or fields) after the contents of the previous paragraphs NM and M segments. Note that N and M, inclusive.

[the root @ localhost ~] # Cut -d "  " -f3- ABC. SH - S 
subjectid Mark Remarks 
longshuai 001   56 is failing 
gaoxiaofang   001  60 pass 
zhangsan 001  50 failed 
Lisi     001    80 pass 
wangwu    001    90 pass

When the cross-range, the output will not be repeated. For example -f3-5,4-6, the output -f3-6.

 

[root@localhost ~]#  cut -d" " -f3-5,4-6 abc.sh -s
SubjectID Mark 备注
longshuai 001  56
gaoxiaofang  001 60
zhangsan 001 50 不及格
lisi   
wangwu   001

 

If the range of random sequence, then the output will first Linux sort of range (in ascending order). E.g. -f4-6,2 equivalent to -f2,4-6.

 

[the root @ localhost ~] # Cut -d "  " -f4- . 6 , 2 ABC. SH - S 
the Name Remarks Mark 
 001   56 is 
  001  60 
 001  50 failed 
   
   001