TLDR
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egrep

 
Find patterns in files using extended regular expression (supports ?, +, {}, () and |). More information: https://manned.org/egrep.
 
  • Search for a pattern within a file:
     
    egrep "{{search_pattern}}" {{path/to/file}}
     
  • Search for a pattern within multiple files:
     
    egrep "{{search_pattern}}" {{path/to/file1}} {{path/to/file2}} {{path/to/file3}}
     
  • Search stdin for a pattern:
     
    cat {{path/to/file}} | egrep {{search_pattern}}
     
  • Print file name and line number for each match:
     
    egrep --with-filename --line-number "{{search_pattern}}" {{path/to/file}}
     
  • Search for a pattern in all files recursively in a directory, ignoring binary files:
     
    egrep --recursive --binary-files={{without-match}} "{{search_pattern}}" {{path/to/directory}}
     
  • Search for lines that do not match a pattern:
     
    egrep --invert-match "{{search_pattern}}" {{path/to/file}}

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