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It uses the Pattern parameter to find the string in the string object. It pipes the content of the string object to the Select-String command. The Get-Content reads the content of the file my.ini specified by the Path parameter. Get-Content -Path C:\Windows\my.ini | Select-String -Pattern "basedir*"
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Use the Get-Content to search for a string in the file using the following command. It reads the content of the file and returns the string object. The Get-Content gets the content of the file specified by the path parameter.
#Search for text in files bash grep how to#
PowerShell Tip: How to find the file last modified date using PowerShell! Using the Get-Content Search for String It finds the string in the file and prints its filename, line number, and a line containing the text. Select-String displays the output on the console. The output of the script to grep a text file is: PS C:\> Select-String -Path D:\PowerShell\*.* -Pattern 'Get-'ĭ:\PowerShell\GetFileProperties-Assignment.txt:1:Get-ChildItem -File | Select name,CreationTimeĭ:\PowerShell\print-spooler-service-Test.ps1:1:$PrintSpooler = Get-Service -Name Spoolerĭ:\PowerShell\print-spooler-service.ps1:1:$PrintSpooler = Get-Service -Name Spooler In the above PowerShell script, Select-String uses Pattern ‘Get-‘ to search string in the file specified by the Path parameter. Select-String -Path D:\PowerShell\*.* -Pattern 'Get-' It uses regular expression matching to search for patterns in the file. Use Select-String in PowerShell to find a string in the file. 4.PowerShell search string in the file PowerShell find string in file Of course, we could have used an awk action to do the job of grep, but it makes more sense to use grep to avoid making the expression more complex. We then hand over the output to the grep command, which prints out the lines with the keyword “kernel” in them. Since awk searches the file linearly, the pattern should match the lines that start from the time 17:00:00 to 18:00:00 in sequence. The ? in the regular expression matches exactly one character. Now, let’s print all the kernel logs from December 25 between 17:00:00 and 18:00:00: $ awk '/Dec 25 17:?:?/,/Dec 25 18:?:?/' log | grep kernelĭec 25 17:09:19 hey kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'ĭec 25 19:30:39 hey kernel: perf: interrupt took too long (3966 > 3952), lowering kernel.perf_event_max_sample_rate to 50400 Mind that comma that separates both the patterns. As an example, let’s find the entries of December 25 between 17:10:16 and 17:44:39 in the log file: $ pcregrep -M 'Dec 25 17:10:16.*(\n|.)*Dec 25 17:44:39' logĭec 25 17:10:16 hey NetworkManager: dhcp6 (enp5s0): request timed outĭec 25 17:10:16 hey NetworkManager: dhcp6 (enp5s0): state changed unknown -> timeoutĭec 25 17:44:39 hey NetworkManager: manager: NetworkManager state is now CONNECTED_GLOBALĪs we can see, the pattern is pretty much the same except the (\n|.)* part, which basically matches every character and newline between the two given times. We can enable the multi-line search pattern in pcregrep by providing the -M option. The advantage of using pcregrep is that it’s slightly faster than grep, and we don’t have to refine the matched text with the -Pzo options. The libpcre library is what powers the Perl 5 regular expressions. The pcregrep utility is a grep variant that uses libpcre exclusively. Therefore, we can see two different entries from the log file that matched this pattern. Now, when we combine this regular expression with Dec 25.*\n, we direct grep to match any line inside the log file that starts with Dec 24 until the end of the line, followed by the next immediate line that starts with Dec 25 and ends with a newline. *\n in our case matches any character after Dec 24 until it reaches the newline * in the regular expression will match any character until it reaches a NUL character The pattern signifies that our desired text should start with Dec 24.The -o option enables grep to print only the matched text and ignore trailing spaces.The -z option treats the matched text as a sequence of lines by adding the NUL character to each line’s ending.
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