![]() ![]() When I run the script, I always see that first it writes MATCHED to my protocol_result.txt and then with the second if line it writes NOTMATCHED to the file! While it shouldn't write anything at all. If ] then echo 'NOTMATCHED' | cat > protocol_result.txt fi patterns.txt) and use the -f switch (-R is unnecessary if you are restricting find to files -H will give you the file name in case there is only one -F causes grep to treat the patterns you are searching for as strings. When we talk about matching multiple strings, there are two scenarios, Or and And. if ] then echo 'MATCHED' | cat > protocol_result.txt fi For ease of maintenance (if your list of strings to search may change in the future), I would put the patterns in a file (eg. ![]() I simply want to translate those conditions to another state when nonstandard-protocol is false. | od -c.SpecialCondition is standardized and can be empty or have a matched or unmatched state. Search files in the current directory that is not managed by Git. grep -L string file1 file2 : Suppress normal output and show filenames from which no output would normally have been printed. Let us summaries all the grep command option in Linux or Unix: grep -l word file1 file2 : Display the file name on Linux and Unix instead of normal output. If the files aren't under version control, add -no-index param. Conclusion Grep from files and display the file name. When printed as-is, those delete characters hide the three-character "gap" string.Īnother option would be to pipe the output through od, perhaps. Here is the syntax using git grep combining multiple patterns using Boolean expressions: git grep -e pattern1 -and -e pattern2 -and -e pattern3 The above command will print lines matching all the patterns at once. Where the ^?^?^? characters represent three "delete" characters. If you want to search through multiple files in multiple directories, you can add -R for a recursive search. The OR operator tells grep to search for either of the specified strings. In the following example, the lines containg 'boo' will be. Grep allows you to search for multiple strings at once using the OR operator ( ). This option will treat upper and lower case as equivalent while matching the search string. like so: grep -l 'boo' An option more useful for searching through non-code files is -i, ignore case. I created some test files to demonstrate the difference: $ grep -r gap. The star symbol signifies you want to search in multiple files. This is useful if you are searching through multiple files for the same string. cat and rat are both being matched by the (oneother) syntax we apparently need to escape with backslashes. The \b sets word boundaries and the d operation deletes the line matching the expression between the forward slashes. The cat -v command "displays nonprinting characters as visible characters." Alternatively, to remove the lines in-place one can use sed -i: sed -i '/\b\ (cat\rat\)\b/d' filename. ![]() Or find /u/user/.History/ -type f -exec grep gap + | cat -v Normally grep will return the string that you are searching for, when given the -v flag grep will omit the searched string and return everything else. ![]() The grep command is handy when searching through large log. When it finds a match, it prints the line with the result. The text search pattern is called a regular expression. Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. My recommendation would be to filter the output so that it expands the non-printable portions into printable characters so that you can see the underlying text. Grep is an acronym that stands for Global Regular Expression Print. Combine Patterns as a Regular Expression. I believe your grep -r "gap" /u/user/.History/ command was actually finding the right files and displaying the matching lines it's just that those lines also have non-printable portions that are obscuring the text when the line is written to your terminal. The Linux grep command is a string and pattern matching utility that displays matching lines from multiple files. ![]()
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