Select-String
Select-String is a PowerShell cmdlet that searches text for matches to specified strings or regular-expression patterns.
Practical Automation with PowerShell: Effective scripting from the console to the cloud
Select-String is a PowerShell cmdlet that searches text for matching strings or regular expression patterns.
- How it is used
- Extracts targeted records from Linux files and command output during cross-platform system-information automation.
- How deep it goes
- Demonstrates matching, pipeline extraction, regex processing, and date conversion without detailing cmdlet internals.
- Examples
- Uses /proc/meminfo, stat / output, and the reusable Get-SystemInfo function as operational examples.
- What you can do after
- Builds pipeline-based extractions that isolate matching lines and transform their values for reusable system-information functions.
Learn PowerShell in a Month of Lunches: Fourth Edition, Covers Windows, Linux, and macOS
Select-String is a PowerShell cmdlet that searches text for matches to specified strings or regular expressions.
- How it is used
- Searches recursively collected log files for HTTP errors, browser signatures, and other regular-expression matches.
- How deep it goes
- Demonstrates pipelines, regex construction, MatchInfo fields, and formatted output without exploring cmdlet internals.
- Examples
- Uses 400-series HTTP errors, Gecko user-agent strings, and Security event 4624 messages as search targets.
- What you can do after
- Diagnose log patterns with Select-String and present matching filenames, line numbers, and lines for further review.
Related concepts
- regular expressionuses · A formal pattern notation that describes sets of strings and enables text to be matched, searched, extracted, or transformed.
- MatchInfoproduces · A MatchInfo object is a PowerShell object representing a text match found by Select-String, including information such as the path, line number, and matching line.
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