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grep i

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# EXAMPLE 1: look for any files (with names ending in ".c++") for the text "::MethodA("
grep "::MethodA(" *.c++

# EXAMPLE 2: display only the matching file names (not the row too) of the matches
grep -l "MethodA(" *.c++

# SYNTAX
# grep [optional-filters] "<your-string-to-search>" <files-to-search>


# OPTIONAL-FILTERS
# +--------+----------------------------------------------------------------------------+
# | OPTION |  DESCRIPTION                                                               |
# +--------+----------------------------------------------------------------------------+
# |  -e    |  pattern                                                                   |
# |  -i    |  Ignore uppercase vs. lowercase.                                           |
# |  -v    |  Invert match.                                                             |
# |  -c    |  Output count of matching lines only.                                      |
# |  -l    |  Output matching files only.                                               |
# |  -n    |  Precede each matching line with a line number.                            |
# |  -b    |  A historical curiosity: precede each matching line with a block number.   |
# |  -h    |  Output matching lines without preceding them by file names.               |
# |  -s    |  Suppress error messages about nonexistent or unreadable files.            |
# |  -x    |                                                                            |
# |  -f    |  file: Take regexes from a file.                                           |
# |  -o    |  Output the matched parts of a matching line.                              |
# +--------+----------------------------------------------------------------------------+
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Srekk 95 points 

                                    With -i flag you can grep a substring with insensitive-case:
grep -i &quot;substring_with_lower_or_upper_case&quot;

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