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/\(.\)\1/!d :
For all lines not matching the pattern, delete the pattern space. The ! is for the pattern and not for the action d. This means that for all lines not having at least 1 consecutive...

To find words that have at least one double but not more than 3:

sed -n -e '/\(.\)\1/!d; s//&/4; t' -e p

The number can be parameterized with a shell variable.

Regards,
Alister

To be honest, i dislike perl: IMHO it is like a Swiss Army pocket knife: 756 functions - and not one of them in a usable shape.*)

My suggestion is to do it with simple shell commands. UNIX is...

You've badly messed up the command line and the logic.

Try:
perl -i.old -ne 'print unless m:^\s*<string>com\.apple\.PhotoBooth</string>\s*$:' ~/Library/Compositions/Compound\ Eye.qtz

I...

Anchoring them at line end is a good idea - I had no chance to test it so missed that...
Try also the "abbreviated" pattern ".*f(.{1,2}|.{3}d)$"

As you said, you can have "f" and two letters following, or, "f" and three letters and "d".
Why not use two ored regexs: grep -E ".*f.{1,2}|.*f.{3}d"?

Without -v:
grep '^[^aeiou]*$' twl
Regards,
Alister

Read them like this:

grep lines without a 'vowel'

grep lines with a 'non-vowel'

Frankly, i haven't ever used FreeBSD either. In fact, machines which occupy less than 1m³ of space are not to my liking.



Actually, no. We want "ruby1.9" to be reachable also via "ruby", so we...

It's usually a good idea to leave your originals untouched if at all possible. I don't even like automatic renaming. I prefer to use originals as a template, and create new files. That way, if you...

The contents of a field, as seen by awk, can be changed within an awk program; this changes what awk perceives as the current input record. The actual input is untouched; awk never modifies the input...

This should definitely work!!
awk '!arr[$0]++' ~/path/to/file.txt > ~/path/to/newfile.txt
Please double check and verify if you are missing something.

$0 means 'the entire unmodified line', pure and simple. You can change what 'line' means to awk, but by default, it uses newlines like everything else.

You can think of it as a hash table if you...

Look up associative array: Associative array - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Associative_array)

I'd be more worried if you had, as it's not a regex. It's more like C than anything.

It's an array with a string as the index. It checks if it's zero, then adds to it. The first time the index...

see the explanation:
https://www.unix.com/302678079-post2.html

awk '!arr[$0]++' wordlist_file

The reason is that bash (and any other shell i know of) is bothering to even look in $PWD - unlike DOS/Windows, which did (and this way spoiled people). "bash" looks exclusively along the PATH...

On linux and BSD systems (perhaps other Unices as well), system calls are documented in section 2 and library functions in section 3 of the manual pages.

Builtins typically refer to shell...

The open() system call, which is used to open a file for reading/writing, supports relative paths. When the path to the file does not contain any slashes, it is designed to look in the current...

You're missing the point. If you just type 'mycommand' and hit enter, you won't run something that's been maliciously dumped in a local directory by accident.

You can still do so with ./ but it...

In fact it is: directories where (system) binaries are stored, like "/usr/bin", are writable only for root (and probably for a very select group of other system users). This means that only root can...

Not quite. "fi" is indeed "if" spelled backwards (you will later learn a construct called "case" which ends with "esac") and it ends only the fi-clause, nothing else. Cosider the following...

Yes, absolutely. There are a very few occasions where not quoting has some desired effect and it not done. In the overwhelming majority of cases quoting has no bad effect at all and probably/perhaps...

Of course there is nothing wrong with using "find" - but there are a few points I'd like to highlight. (Just between us experts - there are more ways to skin a cat, isn't it? ;-))

if [[ ! -d...