[英]How to replace a string of specific characters with sed command
I want to use the sed command to delete some specific strings. 我想使用sed命令删除一些特定的字符串。
This is the file(tRNA.fa): 这是文件(tRNA.fa):
>tRNA-Ala-AGC-1-1 (chrII.trna5-AlaAGC) chrII:4565386-4565457 (+) Ala (AGC) 72 bp Sc: 72.4
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
>tRNA-Ala-AGC-1-10 (chrX.trna261-AlaAGC) chrX:7378738-7378809 (-) Ala (AGC) 72 bp Sc: 72.4
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
>tRNA-Ala-AGC-1-11 (chrX.trna260-AlaAGC) chrX:7507245-7507316 (-) Ala (AGC) 72 bp Sc: 72.4
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
I just want to keep “>tRNA-XXX-XXX-XX”and the next line. 我只想保留“> tRNA-XXX-XXX-XX”和下一行。
So,I tried to replace unnecessary information with sed command: 所以,我试图用sed命令替换不必要的信息:
sed -i 's/\(.*\).*[0-9]$//g' tRNA.fa
However,I deleted all the line starting with '>'. 但是,我删除了所有以“>”开头的行。
The result I hope to get is: 我希望得到的结果是:
>tRNA-Ala-AGC-1-1
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
>tRNA-Ala-AGC-1-10
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
>tRNA-Ala-AGC-1-11
GGGGGTATAGCTCAGTGGTAGAGCGCTCCCTTAGCATGGGAGAGGgCTGGGGTTCAATTC
CCCATACCTCCA
If you know how to replace it, please tell me,thank you. 如果您知道如何更换它,请告诉我,谢谢。
If you want to match a (
don't escape it. 如果要匹配(
请不要转义。
sed -i 's/(.*).*[0-9]$//g' tRNA.fa
But really the following is just enough to remove everything after (
: 但实际上以下内容足以删除(
:之后的所有内容
sed -i 's/(.*//' tRNA.fa
Note that you may also want s/ (.*//
to remove that space before (
too. 请注意,您可能还需要s/ (.*//
之前删除空间(
太。
The \\(...\\)
is used to group expression into a subgroup. \\(...\\)
用于将表达式分组为一个子组。 It is most often used for back references, but may also be used for example as \\(abc\\)*
- will search zero or more occurrences of the string "abc"
. 它最常用于反向引用,但也可以用作\\(abc\\)*
-将搜索零个或多个出现的字符串"abc"
。
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