![]() ![]() This will treat the tgt/etc/file1 as the regular expression to search for, and look for it inside the remaining files - it will not process the input from the pipeline because it was given filename arguments. ![]() type f -name \* | grep tgt/etc/file1 tgt/etc/file2 tgt/etc/file3 Thanks Gilles: I deleted the previous comment with incorrect syntax, and tested the ammended version, but it doesn't work without the (for an unexpected reason to me at least). type f -name \* | grep "tgt/et.*/s"Īlso, if you don't quote the argument, and it contains any * characters, the shell will expand the argument as a filename wildcard before passing them as arguments to grep. For your purposes, the commands you want are: find. In a wildcard, * means to match any number of any characters, the equivalent regular expression is. Means to match tgt/etc followed by zero or more / characters. The -or operator either find ‘.c’ or ‘.asm’ file. The -type f option force find to only search files and not directories. The parentheses must be escaped with a backslash, ( and ), to prevent them from being interpreted as special shell characters. have the same value per index to execute queries more efficiently. In a regular expression, * means to match any number of the character or expression that precedes it. Fig.01: Linux find command exclude files command. The wildcard type is optimized for fields with large values or high cardinality. instead of any character).The first argument to grep is not a wildcard, it's a regular expression. With any modern grep implementation, you can also do: grep -F README.mdįor a fixed-string search (where. With that same implementation, wildcard matching can also be enabled within extended ( -E), augmented ( -X) or perl-like ( -P) regular expressions with the (?K) operator (and \(?K\) in basic regular expressions which actually breaks POSIX conformance, so I wouldn't rely on it as it could be removed in a future version). It also assumes file names dont contain wildcard characters (you need set -o noglob when using split+glob and wanting only split), thats theres no file whose name starts with -include and ends in. To match on lines that contain README.md. So with that grep implementation, you can do: grep -K 'README.md' The -print0 option of find and -0 option of xargs ensure the spaces in file and directory names are correctly handled. Note that piping the output of the ls command into grep would not achieve. With ast-open grep, which is also ksh93's grep builtin (not always built-in by default, and you need to enable it by putting /opt/ast/bin ahead of $PATH), you can use the -K option for grep to use shell wildcards (extended ksh93 ones). php files output by find as arguments to a single grep command e.g., grep 'debug (' file1 file2 file3. The echo command can be used to verify that a wildcard expansion will do what. Would again be the same as: grep 'README\.md'Īs grep looks for a match within the line as opposed to finding lines that match the pattern exactly (for which you need -x). such as using wildcard characters in file names, are not valid. The * wildcard operator which matches on 0 or more characters can be written. The exec subroutine, in all its forms, executes a new program in the calling process. Here, it seems you're confusing regular expressions with shell wildcard patterns. Grep does not know how to expand the pattern - it just tries to find files named literally. Since the current directory doesnt contain any files matching the pattern, the patten literal is passed to grep. (the ^s showing what within the line is matched by the regular expression, which you could see with -color) mk happens in the shell, not in grep, before grep gets to apply recursion. Since any number includes 0, that's functionally equivalent to grep '*README.m' (which would make no difference to which lines are being matched, only on what may be matched within the line (which would show with the -color option of GNU grep for instance)).įor instance, it would match on those 2 lines: *README mike regexp operator) followed by m followed by any number of ds. So grep '*README.md*' matches on lines that contain a literal * followed by README followed by any single character (the. In BREs, when at the start of the pattern or when following the ^ or \( regexp operators, it matches a literal * only (it's also taken literally inside bracket expressions). txtxargs grep -l 'directory2'xargs grep -l 'director圓'. * is a regexp operator that matches 0 or more of the preceding atom. Its not very pretty but you can chain the grep together: grep -l 'directory1'. Grep patterns are regular expressions (aka regex, regexp, RE), basic regular expressions (BRE) unless one of -E/ -F/ -P/ -K/ -X option (only the first two of which being standard) is used. ![]()
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