Commands by pkufranky

Commands by pkufranky (3)

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Persistent saving of iptables rules

Should run with sudo
This is sample output - yours may be different.
0

cd /etc/network/if-up.d && iptables-save > firewall.conf && echo -e '#!/bin/sh -e\niptables-restore < $(dirname $0)/firewall.conf' > iptables && chmod a+x iptables

pkufranky · 2011-05-01 03:23:26 0
Rapidly invoke an editor to write a long, complex, or tricky command

Next time you are using your shell, try typing ctrl-x ctrl-e # in emacs mode or <ESC> v # in vi mode The shell will take what you've written on the command line thus far and paste it into the editor specified by $EDITOR. Then you can edit at leisure using all the powerful macros and commands of vi, emacs, nano, or whatever. Show Sample Output
This is sample output - yours may be different.
```
/tmp/bash-fc-3778699542
```
22

<ESC> v or ctrl-x ctrl-e

pkufranky · 2011-04-30 11:08:02 0
bulk rename files with sed, one-liner
This is sample output - yours may be different.
-1

ls | sed 'p;s/foo/bar/' | xargs -n2 mv

pkufranky · 2011-04-30 10:56:35 0

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Line Separator That is Width of Terminal

Creates a line seperator that will be the width of your window.

repeat a command every one second

Short method of "while x=0; do foo ; sleep 1 ; done"

Copy a file over SSH without SCP

C function manual

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Seeing that we get back plain text anyway we don't need lynx. Also the sed-part removes the credit line.

list block devices

Shows all block devices in a tree with descruptions of what they are.

Record audio and video from webcam using ffmpeg

Record from a webcam, audio using ALSA encoded as MP3, video as MPEG-4.

capture mysql queries sent to server

Remove the first and the latest caracter of a string

sed : using colons as separators instead of forward slashes

Having to escape forwardslashes when using sed can be a pain. However, it's possible to instead of using / as the separator to use : . I found this by trying to substitute $PWD into my pattern, like so $ sed "s/~.*/$PWD/" file.txt Of course, $PWD will expand to a character string that begins with a / , which will make sed spit out an error such as "sed: -e expression #1, char 8: unknown option to `s'". So simply changing it to $ sed "s:~.*:$PWD:" file.txt did the trick.

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