Question

存储库包含文件trial.txt，其文本如下：

    Determining Coefficients
    Average Tractions
      trial 1 xyzt 1.987213
      trial 2 xyzt 1.131322
      trial 3 xyzt 1.123132
    trial for abc 1
      1.473248 2.027327
    trial for abc 2
      2.043960 2.043960
    trial for abc 3
      2.027327 1.473248

我正在尝试找到带有grep和管道以及正则表达式的单行表达式，该表达式将从文件中trial for abc #之后的第一行和第三行的数值中仅提取仅。运行命令后的输出应为：

    1.473248 2.027327
    2.027327 1.473248

感谢任何人都可以提供帮助！谢谢。

Answer 1

这对我有效，仅按您的要求使用grep和管道：

grep -A1 "trial for" "trial.txt" | grep -v "trial for"

它的作用是搜索单词“ trial for”，然后打印一行，然后将其传送到另一个grep，该行将删除包含“ trial for”的行，仅打印正确的数量/数字< / p>

Answer 2

您不需要grep或任何管道处理...

sed -ne '/trial for abc [0-9]\+/{n;p}' trial.txt

-n选项停止sed自动打印每一行，并且对于与正则表达式匹配的每一行，将运行命令n和p。 n将下一行读入sed的模式空间，然后p将其打印出来。

Answer 3

这对我有用

“ ^”标记行的开头。

“ [.0-9] *”仅允许使用空格，句点和数字。

“ $”标记该行的结尾。

该表达式并不完美，一般会接受许多其他字符串，但是最简单的表达式将拒绝文本文件中所有不需要的行。

另一个版本，拒绝包含任何字母的所有行

➜  /tmp cat trial.txt | grep "^[ .0-9]*$"
      1.473248 2.027327
      2.043960 2.043960
      2.027327 1.473248

Answer 4

Field_A

为我工作，其中class SQLAFilterConverter(BaseFilterConverter): """ Class for converting columns into a supported list of filters specific for SQLAlchemy. """ conversion_table = (('is_relation_many_to_one', [FilterRelationOneToManyEqual, FilterRelationOneToManyNotEqual]), ('is_relation_one_to_one', [FilterRelationOneToManyEqual, FilterRelationOneToManyNotEqual]), ('is_relation_many_to_many', [FilterRelationManyToManyEqual]), ('is_relation_one_to_many', [FilterRelationManyToManyEqual]), ('is_enum', [FilterEqual, FilterNotEqual]), ('is_text', [FilterStartsWith, FilterEndsWith, FilterContains, FilterEqual, FilterNotStartsWith, FilterNotEndsWith, FilterNotContains, FilterNotEqual]), ('is_binary', [FilterStartsWith, FilterEndsWith, FilterContains, FilterEqual, FilterNotStartsWith, FilterNotEndsWith, FilterNotContains, FilterNotEqual]), ('is_string', [FilterStartsWith, FilterEndsWith, FilterContains, FilterEqual, FilterNotStartsWith, FilterNotEndsWith, FilterNotContains, FilterNotEqual]), ('is_integer', [FilterEqual, FilterGreater, FilterSmaller, FilterNotEqual]), ('is_float', [FilterEqual, FilterGreater, FilterSmaller, FilterNotEqual]), ('is_numeric', [FilterEqual, FilterGreater, FilterSmaller, FilterNotEqual]), ('is_date', [FilterEqual, FilterGreater, FilterSmaller, FilterNotEqual]), ('is_boolean', [FilterEqual, FilterNotEqual]), ('is_datetime', [FilterEqual, FilterGreater, FilterSmaller, FilterNotEqual]), )将在锚行之后打印1行，而下一个grep -A 1 'trial for abc' /tmp/1 | grep '^[0-9. ]+$'将从结果中提取一条带有行号的行

Grep和管道命令提取数字

4 个答案: