Secondly, the wealth of options can be overwhelming.Thirdly, it was written overnight to satisfy a particular need. It has two meanings. (dot): Matches any one character $ grep "..vik" file.txt $ grep "7..9$" file.txt (g) Use \ (backslash): Ignores the special meaning of the character following it $ grep "New\.\[abc\]" file.txt. Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. "To search" - Derives from the standard Unix search utility of the same name. ps -ef | grep processname means: look for lines containing processname in a detailed overview/snapshot of all current processes, and display those lines Note. When type is binary, grep may treat non-text bytes as line terminators even without the -z option. grep find lines containing a pattern; processname - the pattern for grep to search for in the output of ps -ef; So altogether. Here we would be taking a look on grep command in Unix with examples,Linux grep examples,grep command options,egrep command in Unix For more information, see: Regular expression quick reference. The PATTERN is interpreted by grep as a regular expression. [abc] $ grep "S\.K\.Kumar" file.txt It specifies the search pattern as. You could easily replace that with “/etc” for example: grep -r "text_to_find" /etc; I always like to use grep -rn … One as 'The New Idiot' above pointed out. Meaning of GREP. The first two are bang on; the third is slightly off. Firstly, it is tremendously useful. The^` must be the first character within []. What does GREP mean? Information and translations of GREP in the most comprehensive dictionary definitions resource on … ^means "start of line" # is the literal character #-v means "invert the match" in grep, in other words, return all non matching lines. ; Put those together, and your expression is "select all lines that do not begin with #" | is the pipe character, it takes the output of the command on the left hand side, and uses it as the input of the command on the right hand side. If TYPE is text, grep processes a binary file as if it were text; this is equivalent to the -a option. The text search pattern is called a regular expression. It specifies the search pattern as New. Grep is an acronym that stands for Global Regular Expression Print. grep -r "text_to_find" .-r means to recurse “text_to_find” is the string to search for; The dot simply means start the search from the current working directory. When it finds a match, it prints the line with the result. The basic syntax of grep is: grep … $ grep "vedik$" file.txt (f) Use . The name “grep” means “general regular expression parser” The grep command is used to search for text strings or regular expressions within one or more files. Definition of GREP in the Definitions.net dictionary. The grep command is famous in Linux and Unix circles for three reasons. 1 The GREP command- an overview. The Story Behind grep. The other, equally useful, is within character class expression, where it means negation: grep -E '[^[:digit:]]' accepts any character except a digit. In the above example, all the characters we used (letters and a space) are interpreted literally in regular expressions, so only the exact phrase will be matched. 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