How to List installed perl module

Use instmodsh (interactive inventory for installed Perl modules) command to find out what modules already installed on my system. instmodsh command provides an interactive shell type interface to query details of locally installed Perl modules.

 

To display the list enter the following command:
$ instmodsh

This will show the below options,

 

Available commands are:

l - List all installed modules

m - Select a module

q - Quit the program

cmd?

type l to list all installed modules:cmd? l

Installed modules are:

Archive::Tar

CPAN

Class::Spiffy

Compress::Zlib

Cwd

Digest::SHA

IO::Zlib

MIME::Lite

Module::Build

Module::Signature

Net::Telnet

PAR::Dist

Perl

Spiffy

Term::ReadLine

Test::Base

Test::Simple

Text::Glob

Weather::Com

XML::Simple

YAML

cmd?

 

This command itself is a perl script that use ExtUtils::Installed module. type q to exit.

Find And Replace Text with VI

Both vi and vim text editor comes with substitute command for finding and replacing text.

Syntax

:%s/WORD-To-Find-HERE/Replace-Word-Here/g
OR:%s/FindMe/ReplaceME/g

Examples

The substitute command can be used as per your requirements.

VI / Vim Basic Find and Replace

To find each occurrence of 'UNIX', and replace it with 'Linux', enter (press ESC, type : and following command)::%s/UNIX/Linux/g

Find and Replace with Confirmation

Find a word called 'UNIX' and replace with 'Linux', but ask for confirmation first, enter:
:%s/UNIX/Linux/gc

Find and Replace Whole Word Only

Find whole words exactly matching 'UNIX' to 'Linux'; and ask for confirmation too:
:%s/\<UNIX\>/Linux/gc

Case Insensitive Find and Replace

Find 'UNIX' (match UNIX, unix, UnIx, Unix and so on) and replace with 'Linux':
:%s/unix/Linux/gi
Same command with confirmation::%s/unix/Linux/gic

Case sensitive Find and Replace

Find each 'UNIX' and replace with 'bar':
:%s/UNIX/bar/gI
Same command with confirmation::%s/UNIX/bar/gIc

Replace In the Current Line Only

Find 'UNIX' and replace with 'Linux' in the current line only (note % is removed from substitute command):
:s/UNIX/Linux/g
NOTE: You need to prefix % the substitute command to make changes on all lines::%s/UNIX/Linux/g

Replace All Lines Between line 100 and line 250

:{START-n},{END-n}s/word1/word2/g
Find 'UNIX' and replace with 'Linux' all lines between line 100 and line 250, enter::100,200s/UNIX/Linux/g
OR:100,200s/UNIX/Linux/gc

Nginx rewrite rule for url like www.domain.com/something.php?asd=327154723448

When we  need to redirect the url like,

www.domain.com/something.php?asd=327154723448

to

www.domain.com



Please use the below rule, this worked for me in nginx.

rewrite ^/something.php(.*)$ /? http://www.domain.com/? last;




 

Rsync command

cpanel log location

Http status codes

Network File System (NFS)

Features:

• Transparent access to remote  file system.
• Uses RPC for communication.

To check the nfs package, run the command:

rpm  -qa | grep  -i nfs

rpm  -ql nfs-utils

chkconfig --list nfs

chkconfig --level 35 nfs on

1.  Export a directory on the server using /etc/exports 

/path_to_directory         IP_ADDR (options)

#mkdir /nfs1

#vi /etc/exports

/nfs1     192.168.198.134(rw)

:wq

Start NFS service

#service nfs start

Confirm exports using exportfs -v

#exportfs -v

2. Export /nfs2

#mkdir /nfs2

a.       Create a entry in /etc/exports

b.      Update current exports using exportfs –a

3.  Mount Both exports on a remote system:

mount  -t nfs 192.168.198.136:/nfs1         /nfs1

mount –t nfs 192.168.198.136:/nfs2         /nfs2

4.   Allow Local root user  the ability to write to /nfs1 exports:

#vi /etc/exports

/nfs1     192.168.198.136(rw, no_root_squash)

:wq

exportfs  -a

exportfs  -v

Then on client system,

#umount /nfs1

#mount -t nfs 192.168.198.136:/nfs1       /nfs1

#mount

# cd /nfs1

#seq 1000 >  test.txt

5. Setup mount point so that they are available upon reboot

Client system

a.       #vi /etc/fstab

192.168.198.136:/nfs1            /nfs1     nfs          defaults

192.168.198.136:/nfs2            /nfs2     nfs          defaults

Unmount and confirm that NFS mount points will be available when the client system changes run level.

#umount  /nfs1

#umount  /nfs2

#mount –a

#df -h

6. Attempt to mount /nfs1 and /nfs2 from an unauthorized system:

Mount –t nfs  192.168.198.136:/nfs1 /nfs1

Fails because client IP does not match server /etc/exports

So , update server /etc/exports to allow additional hosts/subnet/etc

/nfs1     192.168.198.0/24(rw,, no_root_squash)

/nfs2     192.168.198.0/24(ro)

exportfs –a to update export table.