This can be used to specify multiple search patterns, or to protect a pattern beginning with a hyphen (-). (-e is specified by POSIX.) -f FILE, --file=FILE Obtain patterns from FILE, one per line. The empty file
ubuntu@ip-172-31-3-107:~$ echo this is a text line | grep -e "[s]" -e "line" 1. 从文件读取多个匹配样式匹配 -f FILE, --file=FILE Obtain patterns from FILE, one per line. If this option is used multiple times or is combined with the -e (--regexp) option, search for all...
PATTERNS is one or more patterns separated by newline characters, and grep prints each line that matches a pattern. Typically PATTERNS should be quoted when grep is used in a shell command. A FILE of “-” stands for standard input. If no FILE is given, recursive searches examine the ...
Grep 的基础使用模式为 grep [option...] [patterns] [file...],可以有零个或多个选项参数,以及零个或多个文件参数。Pattern 参数包含一个或多个由换行符分隔的模式,当通过 “-e pattern” 或“-f file” 选项给出模式时,将省略该参数。关于 grep 详细的参数解释 (中文介绍) 可以参考菜鸟教程中的Linux ...
output to the actual content:-H,-n, and-b. In order to improve theprobabilitythatlines from a single file will all start at the same column, this also causes the line number and byte offset (if present) to be printed in a minimum size field width. 就是在行号、byte-offset列对齐输出...
Simply put, regular expressions are symbolic notations used to identify patterns in text. In some ways, they resemble the shell’s wildcard method of matching file and pathnames, but on a much grander scale. Regular expressions are supported by many command line tools and by most programming ...
In addition, two variant programsegrepandfgrepare available.Egrepis the same asgrep -E.Fgrepis the same asgrep -F. OPTIONS -ANUM, --after-context=NUM PrintNUMlines of trailing context after matching lines. Places a line containing--between contiguous groups of matches. ...
Do not ignore case distinctions in patterns and input data. This is the default. This option is useful for passing to shell scripts that already use -i, to cancel its effects because the two options override each other. -v, --invert-match Invert the sense of matching, to select non...
grep -epattern_one-epattern_twofilegrep -e 'pattern_onepattern_two'file causesgrepto behave likefgrep. -fpatternfile reads one or morepatterns frompatternfile.Patterns inpatternfileare separated by newlines. causesgrep,egrep. orfgrepto behave like the standardgreputility. ...
can be combined to create complex yet elegant search patterns. However,grepis a search tool, and does not provide any direct capability to edit or modify a line of text in the data stream when a match is made. For that purpose, we need a tool likesed, which I cover in my next ...