PowerShell equivalent to grep -f

Question

I m looking for the PowerShell equivalent to grep --file filename  If you don t know grep  filename is a text file where each line has a regular expression pattern you want to match   Maybe I m missing something obvious  but Select-String doesn t seem to have this option

User · Answer

PS  new-alias grep findstr PS  C  WINDOWS gt  ls   grep -I -N exe  105 -a---        2006-11-02     13 34      49680 twunk 16 exe 106 -a---        2006-11-02     13 34      31232 twunk 32 exe 109 -a---        2006-09-18     23 43     256192 winhelp exe 110 -a---        2006-11-02     10 45       9216 winhlp32 exe  PS  grep

User · Answer

I find out a possible method by  quot filter quot  and  quot alias quot  of PowerShell  when you want use grep in pipeline output grep file should be similar   first define a filter  filter Filter-Object   string  pattern        Out-String -InputObject    -Stream   Select-String -Pattern  quot  pattern quot     then define alias  New-Alias -Name grep -Value Filter-Object  final  put the former filter and alias in your profile    Home My  Documents PowerShell Microsoft PowerShell profile ps1  Restart your PS  you can use it   alias   grep  grep                                                                      relevent Reference  alias  Set-Aliasenter link description here New-Aliasenter link description here  Filter Special function enter link description here  Profiles just like  bashrc for bash  enter link description here  out-string this is the key enter link description here in PowerShell Output is object-basedenter link description here so the key is convert object to string and grep the string   Select-Stringenter link description here Finds text in strings and files

User · Answer

So I found a pretty good answer at this link  https   www thomasmaurer ch 2011 03 powershell-search-for-string-or-grep-for-powershell   But essentially it is   Select-String -Path  C  file Path   txt  -Pattern   Enter REGEX Here     This gives a directory file search   or you can just specify a file  and a file-content search all in one line of PowerShell  very similar to grep  The output will be similar to   doc txt 31  Enter REGEX Here HelloWorld txt 13  Enter REGEX Here

User · Answer

This question already has an answer  but I just want to add that in Windows there is Windows Subsystem for Linux WSL   So for example if you want to check if you have service named Elasicsearch that is in status running you can do something like the snippet below in powershell  net start   grep Elasticsearch

User · Answer

Maybe    regex  regex    get-content  lt regex file gt    foreach                  0    -f               -join      Get-Content  lt filespec gt  -ReadCount 10000    foreach              if     -match  regex                                true               break

User · Answer

I m not familiar with grep but with Select-String you can do   Get-ChildItem filename txt   Select-String -Pattern  lt regexPattern gt    You can also do that with Get-Content    Get-Content filename txt  -match  pattern

User · Answer

The -Pattern parameter in Select-String supports an array of patterns  So the one you re looking for is   Get-Content   doc txt   Select-String -Pattern  Get-Content   regex txt    This searches through the textfile doc txt by using every regex one per line  in regex txt

User · Answer

I had the same issue trying to find text in files with powershell  I used the following - to stay as close to the Linux environment as possible   Hopefully this helps somebody   PowerShell   PS  new-alias grep findstr PS  ls -r   txt   cat   grep  some random string    Explanation   ls       - lists all files -r       - recursively  in all files and folders and subfolders    txt    - only  txt files          - pipe the  ls  results to next command  cat  cat      - show contents of files comming from  ls           - pipe the  cat  results to next command  grep  grep     - search contents from  cat  for  some random string   alias to findstr    Yes  this works as well   PS  ls -r   txt   cat   findstr  some random string

User · Answer

but select-String doesn t seem to have this option    Correct  PowerShell is not a clone of  nix shells  toolset   However it is not hard to build something like it yourself    regexes   Get-Content RegexFile txt               Foreach-Object   new-object System Text RegularExpressions Regex        fileList   Get-Content   Where-Object     foreach   r in  regexes        if   r IsMatch               true       break              false

[powershell] PowerShell equivalent to grep -f

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