\log\*.logīy default, the output of the select-string cmdlet will show the filename, line number, and the complete line where the string was found: Powershell Grep Equivalent The grep equivalent would be: grep "error". Select-String "error" "C:\temp\log\*.log" Select-String -Pattern "error" -Path "C:\temp\log\*.log" To search for a particular string in log files we can use the following cmdlet in PowerShell: # Search for the string error in the path Make sure you read through the end for a nice little bonus tip! Finding a String with PowerShell Select-Stringīefore we dive into all the possibilities of the select-string cmdlet, let’s first take a look at a couple of common examples. We are going to take a look at different examples that you can use to find a string with PowerShell. In this article, we are going to take a look at the PowerShell grep equivalent Select-String. PowerShell Select-String Multiple Patterns.Return only the matched string with Raw.Showing lines before and after with Context.Finding a String with PowerShell Select-String.The following description applies to extended regular expressions differences forīasic regular expressions are summarized afterwards. In other implementations, basic regularĮxpressions are less powerful. Is no difference in available functionality using either syntax. (.) grep understands two different versions of regular expression syntax: “basic” and “extended.” In GNU grep, there This can be used to specify multiple search patterns, or to protect a patternīeginning with a hyphen (-). Interpret PATTERN as an extended regular expression (ERE, see below). Selectively citing the man page of gnu-grep: -E, -extended-regexp ² while egrep has been deprecated by POSIX and is sometimes no longer found on some systems, on some other systems like Solaris when the POSIX or GNU utilities have not been installed, then egrep is your only option as its /bin/grep supports none of -e, -f, -E, \| or multi-line patterns ¹ some grep implementations support even more like perl-compatible ones with -P, or augmented ones with -X, -K for ksh wildcards. To work around that, with some grep implementations like GNU grep, you can use the -H option, or with any implementation, you can pass /dev/null as an extra argument. Note that if *.txt expands to a single file, grep won't prefix matching lines with its name like it does when there are more than one file. Or store those patterns in a file, one per line and run grep -f that-file - *.txt
Or put patterns on several lines: grep - 'foo You can do this by preceding each pattern with the -e option. You need to pass the -E option to grep to select it (formerly that was done with the egrep separate command²) grep -E - 'foo|bar' *.txtĪnother possibility when you're just looking for any of several patterns (as opposed to building a complex pattern using disjunction) is to pass multiple patterns to grep.
#Grab grep pattern after a symbol portable#
The portable way is to use the newer syntax, extended regular expressions. The old, default syntax ( basic regular expressions) doesn't support the alternation ( |) operator, though some versions have it as an extension, but written with a backslash. Second, grep supports at least¹ two syntaxes for patterns. If you do need a single quote, you can write it as '\'' (end string literal, literal quote, open string literal). (also note the - end-of-option-marker to stop some grep implementations including GNU grep from treating a file called -foo-.txt for instance (that would be expanded by the shell from *.txt) to be taken as an option (even though it follows a non-option argument here)). Single quotes prevent expansion of anything between them (including backslashes) the only thing you can't do then is have single quotes in the pattern. The easiest way to do that is to put single quotes around it. First, you need to protect the pattern from expansion by the shell.
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