Change or Remove Passphrase Key in ssh Private Key

Change or Remove Passphrase Key in ssh Private Keys

# ssh-keygen -p -f private_key
Enter old passphrase:
Key has comment 'private_key'
Enter new passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved with the new passphrase.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.

I have an error after I do fdisk on my new disk.

[root@local ~]$

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): p

Disk /dev/sdb: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      243201  1953512001   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@local ~]$

Solution:

hdparm -z /dev/sdb

How to change crontab editor

How to change the default crontab editor

export VISUAL='vim'

How to identify if your bash shell is vulnerable to Bash Code Injection Vulnerability (CVE-2014-6271) , CVE-2014-7169

This new vulnerable in bash is spreading quickly over the Internet just like the heartbleed. How to know if your bash version is vulnerable?
For Linux

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

For Solaris 10

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

For Solaris 11

env x='() { :;}; echo vulnerable' bash -c "echo this is a test"

Solution is of course to patch or update to the latest version of bash. Go check out your OS for any updates now.

Starting spamd: child process [22173] exited or timed out without signaling production of a PID file

I upgraded spamassassin and encountered an error when trying to start it.

[root@nelsoncli Mail-SpamAssassin-3.4.0]# /etc/init.d/spamassassin start
Starting spamd: child process [22173] exited or timed out without signaling production of a PID file: exit 255 at /usr/bin/spamd line 2960.
                                                           [FAILED]

Solution: Run sa-update.

httpd: apr_sockaddr_info_get() failed for

Error:

[root@kraken htdocs]# /usr/local/apache2/bin/apachectl start
httpd: apr_sockaddr_info_get() failed for kraken
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
[root@kraken htdocs]#

Solution:

Edit your httpd.conf and check the line

ServerName

You may put ServerName <hostname> or Server localhost

gvfs Permission denied

I'm trying to delete a certain file using inum because I could not delete it using the filename. To my surprise, I could not delete it either. The file I'm trying to delete is:

 -rw-r--r-- 1 root root 0 Aug 6 2012 ./?}>L1]?b1?}9?R?#?M???M@ 

 It has an inum of 3932293 so I execute find . -inum 3932293 -exec ls -l {} \; but still could not delete either.

[root@nelsoncli admin]# find . -inum 3932293 -exec ls -l {} \;          
-rw-r--r-- 1 root root 0 Aug  6  2012 ./?}>L1]?b1?}9?R?#?M???M@
find: `./.gvfs': Permission denied

So what the heck is gvfs. I have no time to do a research just that my goal is to delete this file. So I search the web and the solution was to unmount it.

root@nelsoncli admin]# umount /home/admin/.gvfs

After that, I was able now to delete the file.