I am trying to search for the substring "abc" in a specific file in linux/bash
So I do:
grep '*abc*' myFile
It returns nothing.
But if I do:
grep 'abc' myFile
It returns matches correctly.
Now, this is not a problem for me. But what if I want to grep for a more complex string, say
*abc * def *
How would I accomplish it using grep?
The asterisk is just a repetition operator, but you need to tell it what you repeat.
/*abc*/ matches a string containing ab and zero or more c's (because the second * is on the c; the first is meaningless because there's nothing for it to repeat). If you want to match anything, you need to say
.* -- the dot means any character (within certain guidelines). If you want to just match abc, you could just say
grep 'abc' myFile. For your more complex match, you need to use
grep 'abc.*def' myFile will match a string that contains abc followed by def with something optionally in between.
Update based on a comment:
* in a regular expression is not exactly the same as * in the console. In the console, * is part of a glob construct, and just acts as a wildcard (for instance
ls *.log will list all files that end in .log). However, in regular expressions, * is a modifier, meaning that it only applies to the character or group preceding it. If you want * in regular expressions to act as a wildcard, you need to use
.* as previously mentioned -- the dot is a wildcard character, and the star, when modifying the dot, means find one or more dot; ie. find one or more of any character.
The dot character means match any character, so
.* means zero or more occurrences of any character. You probably mean to use
.* rather than just