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You might already have your answer, but for my own curosity I'm just trying to understand it as well.

Input: File
Output = Input - lines that contain the specified sequences.
Sequences: You can...

Ok, cool. You gave me some insight. For reference, the below line returns lines with exactly 3 matches if 'x' in the entire line.
3 can be replaced with any positive integer.
'x' can be replaced by...

Hello, I apologize if the message was unclear.

The problem is: I want to use the following advanced regular expression syntax "(?:)" which represents grouping without backreference.
Related...

Hello,

I'm working on unix with grep (GNU grep) 2.5.1. I'm going through some of the newer regex syntax using Regular Expression Reference - Advanced Syntax...

Hey, thanks that was exactly what I was looking for. I'm just trying to work through the logic for the grep part:

^[^x]* = match characters that aren't 'x' at the beginning of a line, zero or more...

Thanks, that definitely does it.

I haven't gotten around to awk and sed so I'm still unsure on how they operate exactly. This is mainly an exercise for myself to understand the basics on regular...

Ok, cool.

grep -o prints just the matching sting on its own line.
[^ ]*$ matches any number of non-space, non-tab characters in a sequence that are at the of a line.

So, this seems good for...

Ok, so if I'm trying to use grep to execute the regular expression:

^(.*)(\r?\n\1)+$

To remove duplicate lines that are in sequence, then its simply a regular expression that goes beyond what...

Hello,

I looking to use grep to return a string with exactly n matches.

I'm building off this:


ls -aLl /bin | grep '^.\{9\}x' | tr -s ' '




-rwxr-xr-x 1 root root 632816 Nov 25...

Hello,

I'm having an consistency issue....


grep 'a' /usr/share/dict/words


1) This will highlight every 'a' in each word.


grep 'a\{1,\}' /usr/share/dict/words


2) This...

Hey, thanks for the help.

I did implement the repetion for safety which prevents sequences else where matching 'x ' from being flagged.

Ok, so when I use ls -aLl, it will replace all the...

I have the following code:
ls -al /bin | tr -s ' ' | grep 'x[ ]'
ls -al: Lists all the files in a given director such as /bin
tr -s ' ': removes additional spaces between characters so that there...

Hey, thanks for the reply. sed is a pretty powerful tool.

I was able to do it with tr as well:

ls -l | tr -s ' '

Still wondering if its possible to do something similar with grep?

ls -l generates something like...

-rwxr-xr-x 1 root root 19304 Jan 21 2009 true
-rwsr-xr-x 1 root root 40208 Jan 21 2009 umount
-rwxr-xr-x 1 root root 22336 Jan 21 2009 uname...

Hello,

I'm working on learning regular expressions and what I can do with them. I'm using unix to and its programs to experiment and learn what my limitations are with them.

I'm working on...

Hey, thanks for the help, such a silly error.

Hello,

This is my first post so, Hello World! Anyways, I'm learning how to use unix and its quickly become apparent that a strong foundation in regular expressions will make things easier. I'm...