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15 Feb 2010 For example, the command grep -E '{1' searches for the two-character string {1 instead of reporting a syntax error in the regular expression. For example, the following two commands are equivalent: grep -e pattern_one -e pattern_two file grep -e 'pattern_one pattern_two' file. -F; --fixed-strings. 22 Jul 2013 Grep is a tool used to search for specified patterns within text input using For example, if we want to match anything that has two characters and . by using the "-E" flag or by calling the "egrep" command instead of grep. 4 May 2015 For example i want to search 'linuxtechi' and 'root' word in a single grep command , then using -e option we can search multiple patterns . So, can someone explain it to me using examples what is the difference between the For example, the command grep -E '{1' searches for the 26 Mar 2009 In this article let us review 15 practical examples of Linux grep command that . cat test-file.txt a b c d $ grep -v -e "a" -e "b" -e "c" test-file.txt d The -e option to grep simply says that the following argument is the regular expression. Thus: The ERE option means the same regular expressions, more or less, as used to be recognized by the egrep command, which is no longer a part of POSIX (having been replaced by grep -E , and fgrep by grep -F ). 5 days ago egrep is the same as running grep -E. In this mode, grep evaluates your PATTERN string as an extended regular expression (ERE). Nowadays 21 Oct 2011 For example, grep either Tech or Sales from the employee.txt file. If you use the grep command with -E option, you just need to use | to 5 Apr 2008 Examples. In this example, search warning, error, and critical words in a text log file called grep -e 'warning|error|critical' /var/log/messages
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