- 【重要】Print file name and line number for each match: egrep --with-filename --line-number "search_pattern" path/to/file - Search for a pattern in all files recursively in a directory, ignoring binary files: egrep --recursive --binary-files=without-match "search_pattern" path/to/dir...
The fundamental building blocks are the regular expressions that match a single character. Most characters, including all letters and digits, are regular expressions that match themselves. Any meta-character with special meaning may be quoted by preceding it with a backslash. 基本的构建块是匹配单个字...
To match blank lines, use the pattern ‘^[[:blank:]]*$’. 即,grep 命令认为每一行都包含空字符串,所以提供的匹配模式为空字符串时,会匹配到所有行。 匹配模式写为 '^'、'$'、'.*',也是会匹配到所有行。 如果想要匹配空行,匹配模式可以写为 '^$',空行只包含一个行末的换行符。 如果想要匹配只...
The fundamental building blocks(建筑模块) are the regular expressions that match a single character. Most characters, including all letters and digits, are regular expressions that match themselves. Any meta-character(元字符) with special meaning may be quoted by preceding it with a backslash. The ...
- match any character\n"); fprintf(stderr," * - match 0 or more occurrences of previous char\n"); fprintf(stderr," + - match 1 or more occurrences of previous char.\n"); fprintf(stderr," ^ - match at beginning of string\n"); fprintf(stderr," $ - match end of string\n")...
Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 即,-q 选项指定不打印任何内容到标准输出,即使遇到错误也不打印,只会返回命令执行的结果,如果匹配返回 0,否则返回非 0 值。
The fundamental building blocks are the regular expressions that match a single character. Most characters, including all letters and digits, are regular expressions that match themselves. Any meta-character with special meaning may be quoted by preceding it with a backslash. The period . matches ...
`?` Matches zero or one occurrences of the preceding character. `[]` Matches any character within the square brackets. `^` Matches the beginning of a line. `$` Matches the end of a line. For example, the following regular expression will match any line that starts with the letter "a"...
--include=FILE_PATTERN search only files that match FILE_PATTERN --exclude=FILE_PATTERN skip files and directories matching FILE_PATTERN --exclude-from=FILE skip files matching any file pattern from FILE --exclude-dir=PATTERN directories that match PATTERN will be skipped. ...
If one of these options does have data, it must be given in the first form, using an equals character. Otherwise pcre- grep will assume that it has no data. MATCHING ERRORS It is possible to supply a regular expression that takes a very long time to fail to match certain lines. Such...