Run at prompt, replacing development.log with the name of the log file

echo -n > development.log

In order to get greater than and less than signs without using the retarded French keyboard layout for those keys, remap keys using xmodmap. For help and testing xev can show you what is being typed.

Place the following inside ~/.bashrc to have it run whenever you login.

xmodmap -e "keysym a = a A ae AE less less"
xmodmap -e "keysym z = z Z guillemotleft less greater greater"
xmodmap -e "keysym semicolon = period semicolon horizconnector multiply horizconnector multiply"
xmodmap -e "keysym ugrave = percent percent percent percent percent percent"

The order of the letters after the = sign signify the modifiers to the keypress. The first is without modifier (natural key press of 'a'. Second is with Shift. Third and fourth is after a Mode_Switch (in RedHat Linux that is pressing Shift_R + Alt_R simultaneous, in that order) but without modifier after switching modes. And the last two is with Alt_R and Alt_R + Shift_R modifiers.


To see what currently is mapped use

xmodmap -pke | less

// Find IPs connected to HTTP (Port 80)

netstat -an | grep :80 | awk '{ print $5 }' | awk -F: '{ print $1 }' | sort | uniq -c | sort -n

// Fix permissions on a directory

chown -R youruser:youruser /thedirectory
find /thedirectory -type f -exec chmod 0644 {} \;
find /thedirectory -type d -exec chmod 0755 {} \;

//How to mount MDF images in any given folder

mount imagen.mdf /path/mount_directory -o loop=/dev/loop0

Also here
Mount MDF images in Linux

On Linux, if you have an ISO file and need to create a virtual CD/DVD, just run the command below.

dd if=/dev/cdrom of=/directory/filename.iso

mount -o loop /directory/filename.iso /mountpoint/

When "grep -c" doesn't cut it (counts only 1 occurrence per line).

perl -lne '$c++ while /SEARCH_STRING/g; END { print $c; }'

For example, to count the number of times ABCD appears in mysqldump output:

mysqldump my_db | perl -lne '$c++ while /ABCD/g; END { print $c; }'

Modified version of snippet found in http://www.wellho.net/forum/Perl-Programming/Issue-with-Grep.html

Bundle my_dir

tar cvf - my_dir | gzip -c > my_dir.tar.gz

Unbundle my_dir

gunzip -c my_dir.tar.gz | tar xvf -

When check out the files, use

cvs export

instead of

cvs checkout

can avoid creating those CVS directories

If files already exist, then in bash, do

find . -name CVS -prune -exec rm -rf {} \;

Edit /etc/network/interfaces and adjust it to your needs (in this example setup I will use the IP address 192.168.178.50 for eth0):

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
        script grep
        map eth0

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.178.50
        netmask 255.255.255.0
        network 192.168.178.0
        broadcast 192.168.178.255
        gateway 192.168.178.1
        #optional
        #dns-nameserver 102.168.178.1

You can also edit /etc/resolv.conf to configure a dns-server to use:

nameserver 192.168.178.1

// Extract all tar files in a dir

for i in *.tar; do echo working on $i; tar xvzf $i ; done

// Delete all the .jpg files in all directories below the current

find /PATH/TO/STARTING/DIRECTORY  -type f -name "*.jpg" -delete

// Check Disk Usage on Linux

du -sh /PATH/TO/DIRECTORY

Makes a symbolic link in linux

ln -s /home/dir_to /home/dir_from

//dir_to is the existing directory you want dir_from to point to symbolically

rpm2cpio filename | cpio -i --make-directories

sudo chmod u+s /usr/bin/shfsmount /usr/bin/shfsumount

This isn't a brilliant script, but it sure can be a time saver. When I add a public key by hand I end up doing a lot more commands.

#!/bin/bash

## USAGE: add_to_server.sh remote_server

## This script will add your ssh dsa public key to remote_server's authorized_keys list, 
## assuming that everything is in it's default location

set -v                                 # verbose output
username="USERNAME"              # CHANGE ME!!!!
remote_server=$1              # assigns the first commandline argument to $remote_server


## Pipe the public key to ssh, then remotely touch the file to make sure it will be there, and concat to the end of it.
## Might work without the touch?
cat ~/.ssh/id_dsa.pub | ssh ${username}@${remote_server} "touch ~/.ssh/authorized_keys && cat - >> ~/.ssh/authorized_keys"

exit 0

setterm -blength 0

Sets the bell length to zero for all applications

Edit

/etc/network/interfaces 

and adjust it to your needs (in this example setup I will use the IP address 192.168.0.100):

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
        script grep
        map eth0

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.0.100
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
        gateway 192.168.0.1

When a mac accesses storage not formatted in it's own HFS format, it stores it's additional metadata about the file in another file named the same but starting with "._" It can be annoying and when you're accessing a remote volume that's source control managed with subversion, they show up your status information. This bash shell script will get remove of all ._metadata files residing below the current working directory.

#!/bin/sh
for i in `find . -regex '.*\._.*'`; do rm $i; echo "removing $i"; done

If you save that as "/home/$USER/bin/cleanup" and do a "chmod 777 /home/$USER/bin/cleanup" it will be available next time you open a terminal by just typing "cleanup".