How do I grep multiple patterns in Unix?
How do I grep for multiple patterns?
- Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
- Next use extended regular expressions: egrep ‘pattern1|pattern2’ *. py.
- Finally, try on older Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
- Another option to grep two strings: grep ‘word1\|word2’ input.
Which command is used for pattern matching in Unix?
grep command
grep command in Unix/Linux. The grep filter searches a file for a particular pattern of characters, and displays all lines that contain that pattern. The pattern that is searched in the file is referred to as the regular expression (grep stands for globally search for regular expression and print out).
Which option is used when we need to match multiple patterns in a single invocation of grep command?
GNU grep supports three regular expression syntaxes, Basic, Extended, and Perl-compatible. When no regular expression type is specified, grep interpret search patterns as basic regular expressions. To search for multiple patterns, use the OR (alternation) operator.
Which of the following symbols are used for matching multiple patterns?
Explanation: Most of the regular expression character are used for matching patterns, but there are two symbols that are used for matching pattern at beginning or end of a line. These symbols are ^ and $.
Is the command used for pattern matching?
Generally, the REGEXP_LIKE(column_name, ‘regex’) function is used for pattern matching in SQL. SQL also supports some operators that work similar to this function, these are: ‘REGEXP’ and ‘RLIKE’ operator.
How do you get surrounding lines grep?
To also show you the lines before your matches, you can add -B to your grep. The -B 4 tells grep to also show the 4 lines before the match. Alternatively, to show the log lines that match after the keyword, use the -A parameter. In this example, it will tell grep to also show the 2 lines after the match.
How grep a pattern with next line?
the -M option allows it to match across multiple lines, so you can search for newlines as \n . grep patterns are matched against individual lines so there is no way for a pattern to match a newline found in the input.
Which of the following symbols are used for matching multiple patterns in Unix?
