Commands by hans

Commands by hans (3)

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this toggles mute on the Master channel of an alsa soundcard

I've had this as mute.sh in my ~/bin/ for some time.
This is sample output - yours may be different.
0

on="off"; off="on"; now=$(amixer get Master | tr -d '[]' | grep "Playback.*%" |head -n1 |awk '{print $7}'); amixer sset Master ${!now}

hans · 2009-02-25 09:03:08 8
Create passwords and store safely with gpg

Adjust the head -c part for password length. I use filenames like "hans@commandlinefu.com.gpg" and a vim which automatically decrypts files with .gpg suffixes.
This is sample output - yours may be different.
2

tr -dc "a-zA-Z0-9-_\$\?" < /dev/urandom | head -c 10 | gpg -e -r medha@nerdish.de > password.gpg

hans · 2009-02-25 08:48:26 7
Show biggest files/directories, biggest first with 'k,m,g' eyecandy

I use this on debian testing, works like the other sorted du variants, but i like small numbers and suffixes :) Show Sample Output
This is sample output - yours may be different.
```
[user@host]> bigfiles
123 m   .
47 m    ./media
27 m    ./.mozilla
21 m    ./src
14 m    ./downloads
1 m     ./.openoffice.org
1 m     ./uni
288 k   ./.gstreamer-0.10
208 k   ./sketchbook
128 k   ./.config
124 k   ./.ipython
56 k    ./.fontconfig
32 k    ./.pal
```
16

du --max-depth=1 | sort -r -n | awk '{split("k m g",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}'

hans · 2009-02-24 11:03:08 10

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Remove old kernel packages

Find out when your billion-second anniversary is (was). (on OS X)

This is the same command as this one, but for OS X. http://www.commandlinefu.com/commands/view/3053/find-out-when-your-billion-second-anniversary-is-was.

Search some text from all files inside a directory

Get all files of particular type (say, PDF) listed on some wegpage (say, example.com)

See man wget if you want linked files and not only those hosted on the website.

Real full backup copy of /etc folder

Yes, rsync(1) supports local directories. And, should anything change, it's trivial to run the command again, and grab only the changes, instead of the full directory.

Press ctrl+r in a bash shell and type a few letters of a previous command

In the sample output, I pressed ctrl+r and typed the letters las. I can't imagine how much typing this has saved me.

Find brute force attempts on SSHd

Searches the /var/log/secure log file for Failed and/or invalid user log in attempts.

Show IP Address in prompt --> PS1 var

when working with many machines in a computer lab need to know the IP addr is very large, this is a simplistic solution to make things easier

Cut the first 'N' characters of a line

Saves one character, the original is probably clearer

set your screensaver as your desktop background MAC OSX

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Commands by hans (3)

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