Commands tagged regexp sorted by votes

Commands tagged regexp (6)

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Are there any words in the English language that use at least half of the alphabet without repeating any letters?

This is the most straightforward approach: first regexp limits dictionary file to words with thirteen or more characters, second regexp discards any words that have a letter repeated. (Bonus challenge: Try doing it in a single regexp!) Show Sample Output
This is sample output - yours may be different.
```
# You'll just have to try it to find out!
```
6

cat /usr/share/dict/words | egrep '^\w{13,}$' | egrep -iv '(\w).*\1'

hackerb9 · 2014-09-29 12:52:09 3
Parse YouTube url (get youtube video id)

url can be like any one of followings: url="MejbOFk7H6c" url="http://youtu.be/MejbOFk7H6c" url="https://youtube.com/watch?feature=player_embedded&v=MejbOFk7H6c#t" url="//www.youtube.com/v/MejbOFk7H6c?hl=ru_RU&version=3&rel=0" url="http://www.youtube.com/embed/MejbOFk7H6c?feature=player_embedded" If url mismatching, whole url will be returned. Show Sample Output
This is sample output - yours may be different.
```
MejbOFk7H6c
```
3

sh -c 'url="http://youtu.be/MejbOFk7H6c"; vid="`for i in ".*youtu\.be/$[^\/&?#]\+$" ".*youtu.\+v[=/]$[^\/&?#]\+$" ".*youtu.\+embed/$[^\/&?#]\+$"; do expr "${url}" : "${i}"; done`"; if [ -n "${vid}" ]; then echo ${vid}; else echo "${url}"; fi'

qwertyroot · 2013-09-04 19:33:09 0
get rid of lines with non ascii characters

found here: https://stackoverflow.com/a/9035939
This is sample output - yours may be different.
1

grep -v $'[^\t\r -~]' my-file-with-non-ascii-characters

saps · 2019-03-13 14:46:02 0
extract email addresses from some file (or any other pattern)
This is sample output - yours may be different.
1

grep -Eio '([[:alnum:]_.-]{1,64}@[[:alnum:]_.-]{1,252}?\.[[:alpha:].]{2,6})'

mikhail · 2020-07-22 22:40:33 2
Get user's full name in Mac OS X

Its possible to user a simple regex to extract de username from the finger command. The final echo its optional, just for remove the initial space Show Sample Output
This is sample output - yours may be different.
```
$ finger $(whoami) | egrep -o 'Name: [a-zA-Z0-9 ]{1,}' | cut -d ':' -f 2 | xargs echo                                                           2.1.2
Sebastian Webber
```
0

finger $(whoami) | egrep -o 'Name: [a-zA-Z0-9 ]{1,}' | cut -d ':' -f 2 | xargs echo

swebber · 2014-09-24 01:22:07 1
Get user's full name in Mac OS X
This is sample output - yours may be different.
0

finger $(whoami) | perl -ne '/Name: ([a-zA-Z0-9 ]{1,})/ && print "$1\n"'

zil0g · 2014-09-30 11:37:47 0

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Keep one instance of an irc chat client in a screen session

This command attempts to attach to existing irssi session, if one exists, otherwise creates one. I use "irc" because I use different irc clients depending on what system I am working on. Consistency is queen.

record the input of your sound card into ogg file

save the input into a ogg file

Recursively remove .svn directories from the current location

chroot, bind mount without root privilege/setup

PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc. This means that users don't need any privileges or setup to do things like using an arbitrary directory as the new root filesystem, making files accessible somewhere else in the filesystem hierarchy, or executing programs built for another CPU architecture transparently through QEMU user-mode. Also, developers can use PRoot as a generic Linux process instrumentation engine thanks to its extension mechanism, see CARE for an example. Technically PRoot relies on ptrace, an unprivileged system-call available in every Linux kernel. https://github.com/cedric-vincent/PRoot

Get the IP of the host your coming from when logged in remotely

Even faster without the need for cut... :)

Define an alias with a correct completion

In Bash, when defining an alias, one usually loses the completion related to the function used in that alias (that completion is usually defined in /etc/bash_completion using the complete builtin). It's easy to reuse the work done for that completion in order to have smart completion for our alias. That's what is done by this command line (that's only an example but it may be very easy to reuse). Note 1 : You can use given command line in a loop "for old in apt-get apt-cache" if you want to define aliases like that for many commands. Note 2 : You can put the output of the command directly in your .bashrc file (after the ". /etc/bash_completion") to always have the alias and its completion

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

premiumize - create a ddl & save the URL in variable MYLINK

Find files modified since a specific date

This command uses -newerXY to show you the files that are modified since a specific date. I recommend looking for "-newerXY" on the manpage to get the specifics.

Create .pdf from .doc

sudo apt-get install wv tetex-extra ghostscript

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Commands tagged regexp (6)

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