Vncserver commands

To start vnc server  in different dimensions use

vncserver -geometry 1280x1024  
Default is 1024x768

# makes copy/paste work for realvnc
  vncconfig -nowin &

Command to put all Co files in a directory

cleartool lsco -cview -all -short | xargs -I {} cp {} /dest/path/


its very useful in case of transfer files from local vob to Remote vob


CO all files in a file

cat ~/newfile.txt | xargs cleartool co -nc

To populate file list which need to be co from remote view :

cleartool lsco -cview -all -short >>newfile.txt
---------------------------------------------------------------------------------------------------
Command to change name of a  Vob element .
 As expected Co dir first which contains that elemet


ct move src dest

Vi Adding at begining of Line

For Snmp MIB files to comment many lines is a challenge as we need to insert -- at each line

Command :
Global Insertion at begining each line ^ denotes begining of line
:%s!^!--!
Global Removal from begining of each line
:%s!^--! !

If you have line nos to change lets say from 209 to 461 both including
:209, 461 s!^!--!
:209, 461 s!^--! !

Useful Commands redirecting console output

To make a file Zero size
cat /dev/null > filename.log

Directing Std out in file
command >& file_name

REdirecting Error to stdout
2>&1

Rpm command

Command to verify installed rpms with name
rpm --verify `rpm -qa | grep urRpmname `

To Extract RPM
rpm2cpio   nameofFile.rpm | cpio -ivd

How to Search and Replace stirng using sed

I had to Edit file /etc/sysconfig/ntpd to add option -x in NTPS for instant Sync
cat /etc/sysconfig/ntpd
# Drop root to id 'ntp:ntp' by default.
OPTIONS="-u ntp:ntp -p /var/run/ntpd.pid"

# Set to 'yes' to sync hw clock after successful ntpdate
SYNC_HWCLOCK=no

# Additional options for ntpdate
NTPDATE_OPTIONS=""

I used command
sed -i "s/OPTIONS=.*/OPTIONS=\"-x -g -u ntp:ntp -p \/var\/run\/ntpd.pid\"/" /etc/sysconfig/ntpd

but it was changing wherever OPTION is in Script i.e NTPDATE_OPTIONS was also getting changed
:s/old/new /1 dindnt work in sed

I searched and find out how to solve this
using ^ operator
This command ran fine
sed -i "s/^OPTIONS=.*/OPTIONS=\"-x -g -u ntp:ntp -p \/var\/run\/ntpd.pid\"/" /etc/sysconfig/ntpd

Hot Keys for bash shell

Ctrl + l - Clears the Screen.
Ctrl + r - Does a search in previously given commands in shell.
Ctrl + u - Clears the typing before the hotkey.
Ctrl + a - Places cursor at the beginning of the command at shell.
Ctrl + e - Places cursor at the end of the command at shell.
Ctrl + f - Move forward by one Character
Ctrl + b - Move back by one Character
Ctrl + k - Clear from the current cursor position to the end of the line
Ctrl + w - Clear (word )from the current cursor position to Prwevious white space
Ctrl + d - Kills the shell.
Ctrl + z - Places the currently running process into background.
Ctrl + c - Kill the Process
---------------------------------
Disk Usage of file sizes under each directory in current Directory ?
du -k * | sort -nr (or) du -k . | sort -nr
-------------------------------------------
Display the all files recursively with path under current directory ?
- find . -depth -print
---------------------------------------
List the file by file Size
ls -lrt | sort -nr
-------------------------
Display the parent/child tree of a process ?
ptree Example: ptree 1267
-----------------------------------------------
Show the working directory of a process ?
pwdx Example: pwdx 1267
------------------------------------------------
Display the processes current open files ?
pfiles Example: pfiles 1267

Some VI commands we must know

To go to line
esc linno G            ---> esc 5 G

to go to last line     ---> G

to go to First line   ---> 1 + G

u               ----> undo
cntrl + r   ----> redo

:set nu              to show line no
:set nonu         hide line no
:synt off         Deactivate syntax
:synt on         activate syntax

SEARCH and REPLACE String in VI

First occurrence on current line :s/OLD/NEW

Globally (all) on current line :s/OLD/NEW/g

Between two lines #,#: :#,#s/OLD/NEW/g

Every occurrence in file: :%s/OLD/NEW/g

Working with multiple files

:e filename Edit a file in a new buffer
:bnext (or :bn) go to next buffer
:bprev (of :bp) go to previous buffer
:bd delete a buffer (close a file)
:sp filename Open a file in a new buffer and split window
ctrl+ws Split windows
ctrl+ww switch between windows
ctrl+wq Quit a window
ctrl+wv Split windows vertically


# Scroll forward a page with ---- ctrl-f
# Scroll back a page with ---- ctrl-b
# Scroll forward half a page with ---- ctrl-d
# Scroll back half a page with ---- ctrl-u
#move forward to the beginning of a word with w or W
#move forward to the end of a word with e or E
#move backward to the beginning of a word with b or B
-------------------------

Some Vim settings

set tabstop=4 "number of chars to be inserted when tab is used"
set shiftwidth=4 "To change the no. of space chars inserted for indent"
set softtabstop=4 "makes the spaces feel like real tabs"
set expandtab "convert the tabs to spaces"
we can put it in .vimrc

Vim Link
http://www.vim.org/tips/tip.php?tip_id=12

Some Commands

linux# lspci -v
list all pci buses and the devices connected to them

linux# lsusb
ist all USB buses and the devices connected to them
linux# fdisk -l
for partition
linux#demsg
dmesg - print or control the kernel ring buffer

FIle command n Type command

File command
performs three sets of tests, performed in this order: filesystem tests, magic number tests, and language tests. The first test that succeeds causes the file type to be printed.

File system test : checks for "text" (the file contains only printing characters and a few common control characters and is probably safe to read on an ASCII terminal),

" executable" (the file contains the result of compiling a program in a form understandable to some UNIX kernel or another),
or "data" meaning anything else (data is usually `binary' or non-printable)


example
$file dirname
dirname:directory
$file a.out
a.out:ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU
$file examine.html
examine.html: HTML document text
$file view_this picture.gif
view_this: ASCII English text
picture.gif: GIF image data, version 89a, 88 x 31