How do you grep with a wildcard?
Using the star sign in grep
- grep itself doesn’t support wildcards on most platforms. You have to use egrep to use wildcards.
- @PanCrit: * means the same thing in grep and egrep: it’s a quantifier meaning zero or more of the preceding atom.
- @AlanMoore Thanks for the update.
How do I use grep filename?
Conclusion – Grep from files and display the file name grep -n ‘string’ filename : Force grep to add prefix each line of output with the line number within its input file. grep –with-filename ‘word’ file OR grep -H ‘bar’ file1 file2 file3 : Print the file name for each match.
Does grep support wildcard?
Wildcards. If you want to display lines containing the literal dot character, use the -F option to grep.
How do you grep for filename recursively?
To grep All Files in a Directory Recursively, we need to use -R option. When -R options is used, The Linux grep command will search given string in the specified directory and subdirectories inside that directory. If no folder name is given, grep command will search the string inside the current working directory.
How do I grep a file name in a directory?
The grep command searches through the file, looking for matches to the pattern specified. To use it type grep , then the pattern we’re searching for and finally the name of the file (or files) we’re searching in. The output is the three lines in the file that contain the letters ‘not’.
How do I grep a directory name?
An easy way to do this is to use find | egrep string . If there are too many hits, then use the -type d flag for find. Run the command at the start of the directory tree you want to search, or you will have to supply the directory as an argument to find as well. Another way to do this is to use ls -laR | egrep ^d .
What is the flag in grep?
Adding the color flag ( grep –color ) will highlight the matched portion of the line in red. The red highlight makes it possible to see exactly which part of the string is matched. Some people find it so helpful that they define a shell alias to make grep expand into grep –color so they never have to be without it.
How do you grep a string with special characters?
If you include special characters in patterns typed on the command line, escape them by enclosing them in single quotation marks to prevent inadvertent misinterpretation by the shell or command interpreter. To match a character that is special to grep –E, put a backslash ( \ ) in front of the character.