Trash the hard disk on Solaris VM

If you want to wipe out the boot sector on a Solaris x86 VM so a reboot takes you straight into a net boot to rebuild the host... (because often VMWare takes so long for the console to come up that you don't have a chance to hit F12 before it boots the grub loader)

# dd if=/dev/zero of=/dev/dsk/c1t0d0 count=1 bs=512

Linux: Which processes are using the most RAM?

An easy clear way to see which processes are gobbling all the memory:

$ ps -eo pid,vsz,args | sort -k2n

I got the idea from:
http://superuser.com/questions/398862/linux-find-out-what-process-is-using-all-the-ram

Sometimes when you want to do something on the web, they insist you give an email address to sign up.

Many of them won't accept addresses from

https://www.guerrillamail.com/

But they MAY accept addresses from:

http://www.mailexpire.com/

easy... just point a mailexpire address at a guerrillamail account...

Job done! :-)

VBS script to launch multiple PuTTY sessions

This is to launch parallel PuTTY sessions to a list of hosts, as by the name of their saved PuTTY sessions.

Set objShell = CreateObject("WScript.Shell") dim hosts hosts = "host1 host2 host3 host4" dim host for each host in split(hosts) objShell.Exec "C:\Program Files\PuTTY\PUTTY.EXE -load " + host next

NB: you could use

objShell.Exec "C:\Program Files\PuTTY\PUTTY.EXE username@" + host

instead of

objShell.Exec "C:\Program Files\PuTTY\PUTTY.EXE -load " + host

If you want to log straight into the box without using a saved session

bash command history elements

While you can do

<command> !$

To reuse the last argument of the previous command, you can also use !:n to get the n'th word from the previous command line.

!:0 is the command, the arguments start at index 1.

!* gives ALL of the arguments without the command.

Thanks larsmans & Gilles

Solaris x86 serial numbers

$ ipmitool fru

Invalidate nscd cache

If you want nscd to forget a database, you can invalidate it so that it gets reloaded next time you query it.

Use:

nscd -i <database>

e.g.:

nscd -i passwd

Adding an ACL with chmod

chmod A+user:$USER:write_attributes/write_acl:allow $FILENAME

Look at http://www.cuddletech.com/blog/pivot/entry.php?id=939 for more.

The secret is in the +
Use:

ls -v(a)

To show the existing ACL.

Jump to column in vi

You can jump to a line in vi with <line number>G

To jump to a column on the current line, use <column number>| (pipe character)

Add line after match using ex

This little script is to append a line to a file after a text match, using ex.

This particular one is for /usr/local/etc/sudoers to add a 5 minute timeout to the root sudo.

#!/bin/bash FILE=$1 cp -p $FILE $FILE.old ex $FILE <<EOT /^User_Alias.*UNIX.*wheel a Defaults:UNIX timestamp_timeout=5 . x! EOT