Find multiple strings You can also use grep to find multiple words or strings. You can specify multiple patterns by using the -e switch. Let’s try searching a text document for two different strings: $ grep -e 'Class 1' -e Todd Students.txt Notice that we only needed to use quotes ...
grep的工作方式是这样的,它在一个或多个文件中搜索字符串模板。如果模板包括空格,则必须被引用,模板后的所有字符串被看作文件名。搜索的结果被送到屏幕,不影响原文件内容。 grep可用于shell脚本,因为grep通过返回一个状态值来说明搜索的状态,如果模板搜索成功,则返回0,如果搜索不成功,则返回1,如果搜索的文件不存在...
REGULAR EXPRESSIONS A regular expression is a pattern that describes a set of strings. Regular expressions are constructed analogously to arithmetic expressions, by using various operators to combine smaller expressions. grep understands three different versions of regular expression syntax: “basic” (...
The Linux grep command for multiple patterns or strings is covered in this article. First, we created three files with the names “file.txt”, “linux.txt”, and “name.txt” on our operating system, each of which contains various strings or patterns. Before using the third command on “...
A regular expression is a pattern that describes a set of strings. Regular expressions are constructed analogously(类似) to arithmetic expressions(数学表达式), by using various operators to combine smaller expressions. grep understands two different versions of regular expression syntax: “basic” and ...
The syntax of the command is simple, and it can be used in various ways to search for different types of strings. One of the most useful features of the command is its ability to perform case-insensitive searches. Searching for a string in a file: grep “string” filename ...
Examples of Using Grep for Multiple Strings, Patterns and Words To make sure you understand how to use grep to search multiple strings, we suggestcreating a filewith some text on which we are going to try out a couple of different use cases. ...
1) how do I pass in two strings? This is what I am using now: ps -ef |egrep -i "programname|<defunct>" But this returns multiple results with the word defunct in them. 2) How do I make it so that... 10. Shell Programming and Scripting Grep strings for different cases Hi ...
Named after the qed/ed editor subcommand "g/re/p", where re stands for a regular expression, to Globally search for the Regular Expression and Print the lines containing matches to it. There are two other variants, fgrep which searches only for fixed strings and egrep which accepts extended...
(Search Strings Case-Insensitive) By default grep searches case sensitive which means upper and lower case chars are interpreted as different. If we are looking for ahostnamein a file it is not important uppercase and lowercase so we will turn off case sensitivity for grep. We will provide-...