2) Use –export option to export your public key in text file
$ gpg –export –a > my.key
OR
$ gpg –export -a | mail -s “My key” friend@domain.com

Where
-a –armor : Create ASCII armored output.
–export : Export the key for sharing

First command write output to file my.key and second directly sends an email to your friend. Once my.key delivered to friend, he/she need to import it using the following command (aka adding keys to your keyring):
$ gpg –import my.key

1) First put CDROM/DVD into drive

2) For CDROM: After few second change directory /cdrom/cdrom0 or /cdrom/VOL_NAME

# cd /cdrom/cdrom0

3) For DVDROM: After few second change directory /dvd/VOL_NAMRE

If this does not works make sure volmgt daemon is running:

# /etc/init.d/volmgt start

Scan for devices both cd or floopy using:

#volcheck

1) Boot from Solaris 1st CD

2) At Solaris Device Configuration Assistant, Press F2 key

3) Then press ENTER key twice

4) At Identified Devices, Press F2 key

5) At Boot Solaris, select CD to boot system

6) At next screen system will ask about to “Select the type of Installation”, type
the argument b –s and press ENTER key to boot system into single user mode.

7) Next at shell prompt type the following commands -:

# mount /dev/dsk/c0d0s0 /a
# TERM=ansi
# export TERM
# cd /a

You can access the system.

9) When done type as follows to reboot the system:

# cd /
# umount /a
# init 6

SPARC: To boot system for emergency mode (boot from CD), at ok prompt type:

boot cdrom -s
# mount /dev/dsk/c0t1d0s0 /a
# cd /a
# TERM=vt100
# export TERM
# cd /
# umount /a
# init 6

1) To get PATH (or directories name) type command:

# sysctl kern.module_path

OR

# kldconfig -r

2) The path can modified in /boot/loader.conf file, open this file and look for entry called module_path:

# grep “modile_path” /boot/loader.conf

module_path=”/boot/kernel;/boot/modules;/modules;/new/path”

Note you must open /boot/loader.conf file to change path settings using text editor:

# vi /boot/loader.conf

And make changes to file.

3) Reboot system to take effect.

4) Or on fly, you can add/append path using kldconfig utility, read man page for more info.

When you try and rename it the following is given:

$ mv ––index.html index.html.renamed
mv: unrecognized option `––index.html’
Try `mv ––help’ for more information.

I also tried delimiting it the normal way, but it wouldn’t work either:

    mv \–\–index.html index.html.renamed

The correct way to rename it is:

    mv ./––index.html index.html.renamed

Because –– has special meaning, you can’t delimit it with a simple backslash (\), you have to put a path reference in there to delimit it. So my path working directory (pwd) was /home/user/data/ where the file was located, so I could use ./ to reference the current pwd. The other option is to put the full path in:

    mv /home/user/data/––index.html index.html.renamed

Hopefully this helps out some other Linux server administrator out there who’s mind it has slipped.

You need to use the usermod command. It can modify the system account files (such as /etc/passwd) to reflect the changes that are specified on the command line. The syntax is as follows:
usermod -l {new-login-name} {current-old-login-name}
In this example, rename login id from tom to jerry. Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command
$ sudo usermod -l jerry tom
To verify new changes, enter:
$ id jerry

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Here are a few tasks that you might want to consider using the command line for.

1. Resizing images

Unless you are doing some sort of cropping there is no reason to load up Photoshop or the Gimp. A simple command will usually suffice for almost all your image resizing needs.

    convert -resize 300 image.jpg image-small.jpg

If you finding yourself doing lots of image resizing during the day, this command could potentially save you a LOT of time. You can even do mass image resizing.

2. Adding a Drop Shadow to an Image

I found myself spending a ton of time adding drop shadows to images. Using a simple command I was able to create drop shadows in seconds.

convert screenshot.jpg \( +clone -background black -shadow 60×5+0+5 \) +swap -background white -layers merge +repage shadow.jpg

Note: You must have Imagemagick installed for this command to work. Debian/Ubuntu users can use apt-get install imagemagick.

Obviously, I don’t expect you to memorize this command. To shorten it use an alias.

3. Splice Together an MP3

If you want simple MP3 splicing this command has your back:

    cat 1.mp3 2.mp3 > combined.mp3

4. Clone a Hard Drive

DD is one the most simplistic and powerful image applications out there.

    dd if=/dev/hda of=/dev/hdb

5. Burn an ISO to a CD

Why open up K3B or some other program just to burn an ISO? Map this command to an alias and get burning.

    cdrecord -v speed=8 dev=0,0,0 name_of_iso_file.iso

Note: You need to get the info for the ‘dev=’ part by running ‘cdrecord -scanbus’

6. Video Conversions

Let’s say you want to convert an AVI to an Mpeg file:

ffmpeg -i video_origine.avi video_finale.mpg

Or convert an Mpeg to AVI:

    ffmpeg -i video_origine.mpg video_finale.avi

There are all sorts of things you can do with ffmpeg.

7. Replace Words in a Text File

No need to open up a GUI text editor when you have sed.

This command from Eric’s Wendelin’s blog will replace all instances of a color in CSS with another one.

    sed ’s/#FF0000/#0000FF/g’ main.css

Here is an easy way to accomplish transferring backup files from one server to another in linux. Just simple command using SCP (secure file copy)

scp -C -P portnumber local_filename root@your.ip.address:destination_file

Example:

scp -C -P 2929 backups.tar.gz root@IP.ADDRESS:/home/backups/

-C is compression to speed up transfer.
-r is for recursive
-P is your SSH port number (default ssh port 22)
[If you are running SSH other than default port you will need to specify this]

NOTE:
Dont forget that if you are running a firewall (CSF or APF) make sure that your unblock port in your EG_TCP_PORT (outbound TCP port) in your local host.

The following steps detail the process on how GRUB is reinstalled on the master boot record:

• Boot the system from an installation boot medium.
• Type linux rescue at the installation boot prompt to enter the rescue environment.
• Type chroot /mnt/sysimage to mount the root partition.
• Type /sbin/grub-install /dev/hda to reinstall the GRUB boot loader, where /dev/hda is the boot partition.
• Review the /boot/grub/grub.conf file, as additional entries may be needed for GRUB to control additional operating systems.
• Reboot the system.

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