![]() f FILE, -file= FILE Obtain patterns from FILE, one per line. This can be used to specify multiple search patterns, or to protect a pattern beginning with a hyphen ( -). Matching Control -e PATTERN, -regexp= PATTERN Use PATTERN as the pattern. This is highly experimental and grep -P may warn of unimplemented features. P, -perl-regexp Interpret PATTERN as a Perl regular expression. G, -basic-regexp Interpret PATTERN as a basic regular expression (BRE, see below). F, -fixed-strings Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched. Matcher Selection -E, -extended-regexp Interpret PATTERN as an extended regular expression (ERE, see below). This version number should be included in all bug reports (see below). ![]() V, -version Print the version number of grep to the standard output stream. Print a usage message briefly summarizing these command-line options and the bug-reporting address, then exit. Direct invocation as either egrep or fgrep is deprecated, but is provided to allow historical applications that rely on them to In addition, two variant programs egrep and fgrep are available. By default, grep prints the matching lines. Is included unless the first such option is -include.Grep searches the named input FILEs (or standard input if no files are named, or if a single hyphen-minus ( -) is given as file name)įor lines containing a match to the given PATTERN. If no -include or -exclude options match, a file include and -exclude options are given, the last matching Search only files whose base name matches GLOB (using wildcard ![]() Now, GNU grep, the default on Linux, has a way to do what you want, but the syntax is different: grep 44738 -r -l -include='*.h' If you don't quote it, as you did, the glob will be expanded by the shell to any matching files and grep won't see the glob but only the result of the shell's expansion of it, so only any files or directories in the current directory whose names match the glob. You can use globs as you want if you don't use the -r/ -R flags, but you must quote them, this is essential. As far as I can remember, this has always been the case, at least since I've been using Linux which has been close to 25 years now. Since there is no directory whose name matches the *.c* glob, you get the error you show. The -r/ -R turn on recursive search which means "search through all files in the given directories" so they will make grep treat its argument as a directory to look for files in. First, you cannot combine the -r or -R flags and also give target file names as arguments. What commands should I use for global string search like grep before? My coworker suggest me to use ack, but I found almost the same thing.How can I specify file patterns in grep? Why can't I used patterns like *.c, *.h *.c* as I did it years before?.Did ubuntu-18.04.6 have lots of change on grep?.The result is almost against my experience several years ago. , I just got grep: *.c*: No such file or directory If I used command: grep 44738 -r -l -file *.c*.If I used command: grep 44738 -r -l *.c*, I just got grep., I got the same result except the first line of grep. I got result of grep: *.h: No such file or directory I used below commands and got unexpected similar: grep 44738 -r -l *.h I am sure that some *.h and *.cpp files are under deeper subdirectories. I checked its usage from web and confirm my memory is not corrupted. I enjoyed 'grep' for decades but I left Linux years later and I came back again, finding 'grep' works different from before.
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