Commands by mrwill (7)

  • a simple alarm

    this command will beep like an alarm for one minute from 18:57. you can change "1857" to your desired time. you should have alsa-oss package installed, and you should also be root or part of "audio" group.


    -1
    while true; do while [ `date +%H%M` == "1857" ] ; do sleep 1s; yes | head -n 2000 > /dev/dsp; done; done;
    mrwill · 2011-04-23 14:44:26 9
  • Find the package a command belongs to on Gentoo


    0
    equery belongs $( which mv )
    mrwill · 2011-02-11 22:50:15 4
  • Batch rename extension of all files in a folder, in the example from .txt to .md


    -3
    rename .txt .md *.txt
    mrwill · 2010-12-19 20:04:37 7
  • Use "most" as your man pager

    you should have the "most" package installed. I like it because it is colorful and easier to read. alternatively you can use "less" instead of "most". you can also add this to your ~/.bashrc to make it permanent.


    1
    export MANPAGER='most'
    mrwill · 2010-07-02 08:35:36 9
  • Get IPv4 of eth0 for use with scripts


    0
    ifconfig eth0 | awk '/inet / {print $2}' | cut -d ':' -f2
    mrwill · 2010-06-30 08:52:01 4
  • Show a Package Version on RPM based distributions

    if you want to see all information about a package use: rpm -qi pkgname full list of querytags can be accessed by the command: rpm --querytags you can also customize the query format how ever you like with using more querytags together along with escape sequences in "man printf"! you can also use more than one package name. for example this command shows name and version in to columns: rpm -q --queryformat %-30{NAME}%{VERSION}\\n pkg1 pkg2 Show Sample Output


    2
    rpm -q --queryformat %{VERSION}\\n pkgname
    mrwill · 2010-06-03 01:54:17 12
  • Sort all running processes by their memory & CPU usage

    you can also pipe it to "tail" command to show 10 most memory using processes. Show Sample Output


    13
    ps aux --sort=%mem,%cpu
    mrwill · 2009-10-10 22:48:51 9

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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"

Redirect STDIN
Several times, I find myself hitting my up arrow, and changing the search term. Unfortunately, I find myself wasting too much time typing: $ grep kernel /var/log/messages Redirecting STDIN allows me to put the search term at the end so I less cursor movement to change what I'm searching for: $ < /var/log/messages grep kernel If you're using the emacs keyboard binding, then after you press your up arrow, press CTRL+w to erase the word. If this has already been submitted, I couldn't find it with the search utility.

Push a directory onto the stack
Use also with: Move to respective parameters == () { = +2; } === () { = +3; } ==== () { = +4; } Pop the last entry off the directory stack - () { popd ${1:+"$1"}; }

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