You can read a byte 00 from /dev/zero. Set the blocksize to 1 and dd can overwrite the specified 'block' in that file without shrinking or overwriting it otherwise(seek to skip forward in output, conv=notrunc to not shrink the file to 5 bytes)
Hi
I wounder if some one knows how to make a script to automate user adding?
When i am starting the script it will add user like 04pers00 and fowllowing untill that i'm quit.
The password will be a standard password typed in the file.
I'm unsing Sun solaris 9 on Intel
Sorry for my... (1 Reply)
Hello all,
i've written a small piece of code that will read commands from standard input and executes the commands.
Its working fine and is execting the commands well. Accepting arguments too. e.g
#mkdir <name of the directory>
The problem is that its not letting me change the directory i.e... (4 Replies)
This is my first post so hello to all of you!
I have a script in bash-3.00 that needs to execute the following:
pkgrm (to remove an existing package)
pkgadd -d ( to install a new package)
The problem is that both commands prompt me to answer either y,n or q in order to proceed with... (13 Replies)
I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config.
I am not sure if I can do this with BASH scripting.
I have set up password less login by adding my public key to authorized_keys file, it works.
I am a little... (1 Reply)
Hello!!
Is posible to automate ispell?? I have a lot of misspelled text and I want to launch a script that runs ispell choosing for example the first option, all that automatically. Is possible??
Thanks :) (4 Replies)
Dear all,
I I want to login to my Linux machine using putty and then run some script from Windows machine.we can do it after loging it and then execute the script by typing it in putty command line screen. but I want to automate it.So whenever I will fire this script,it will do the following... (4 Replies)
Hi all,
I'm new in this forum.
I'm looking for the difference between the HACMP commands with the prefix "cl" and "cli".
The first type are under /usr/es/sbin/cluster/sbin directory and the second are under /usr/es/sbin/cluster/cspoc directory.
I know that the first are called HACMP for AIX... (0 Replies)
Hi,
I am trying to count the number of times a string of letters occurs in a file for multiple unique strings of letters. Right now I can do this one at a time using the following code (in this example I am searching for the string "AAA"):
echo AAA >> outfile.txt
grep -c "AAA" -r... (4 Replies)
Hello!
Need help to write a Linux script that can be run from windows using command/Cygwin/any other way. I am new to scripting, actually i am trying to automate server health check like free disk space, memory along with few services status, if any services is not running then start services ,... (7 Replies)
Dear All,
I am relatively new to UNIX and wanted to accomplish a simple task which should be automated. That's why I need your help. I shall briefly describe what I want.
Basically, there is a process (X) (related to a particular software which I am using in my system) which automatically... (5 Replies)
Discussion started by: Samiran Dam
5 Replies
LEARN ABOUT DEBIAN
dd
DD(1) User Commands DD(1)NAME
dd - convert and copy a file
SYNOPSIS
dd [OPERAND]...
dd OPTION
DESCRIPTION
Copy a file, converting and formatting according to the operands.
bs=BYTES
read and write up to BYTES bytes at a time
cbs=BYTES
convert BYTES bytes at a time
conv=CONVS
convert the file as per the comma separated symbol list
count=BLOCKS
copy only BLOCKS input blocks
ibs=BYTES
read up to BYTES bytes at a time (default: 512)
if=FILE
read from FILE instead of stdin
iflag=FLAGS
read as per the comma separated symbol list
obs=BYTES
write BYTES bytes at a time (default: 512)
of=FILE
write to FILE instead of stdout
oflag=FLAGS
write as per the comma separated symbol list
seek=BLOCKS
skip BLOCKS obs-sized blocks at start of output
skip=BLOCKS
skip BLOCKS ibs-sized blocks at start of input
status=noxfer
suppress transfer statistics
BLOCKS and BYTES may be followed by the following multiplicative suffixes: c =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M
=1024*1024, xM =M GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y.
Each CONV symbol may be:
ascii from EBCDIC to ASCII
ebcdic from ASCII to EBCDIC
ibm from ASCII to alternate EBCDIC
block pad newline-terminated records with spaces to cbs-size
unblock
replace trailing spaces in cbs-size records with newline
lcase change upper case to lower case
ucase change lower case to upper case
swab swap every pair of input bytes
sync pad every input block with NULs to ibs-size; when used with block or unblock, pad with spaces rather than NULs
excl fail if the output file already exists
nocreat
do not create the output file
notrunc
do not truncate the output file
noerror
continue after read errors
fdatasync
physically write output file data before finishing
fsync likewise, but also write metadata
Each FLAG symbol may be:
append append mode (makes sense only for output; conv=notrunc suggested)
direct use direct I/O for data
directory
fail unless a directory
dsync use synchronized I/O for data
sync likewise, but also for metadata
fullblock
accumulate full blocks of input (iflag only)
nonblock
use non-blocking I/O
noatime
do not update access time
nocache
discard cached data
noctty do not assign controlling terminal from file
nofollow
do not follow symlinks
Sending a USR1 signal to a running `dd' process makes it print I/O statistics to standard error and then resume copying.
$ dd if=/dev/zero of=/dev/null& pid=$!
$ kill -USR1 $pid; sleep 1; kill $pid
18335302+0 records in 18335302+0 records out 9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s
Options are:
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
REPORTING BUGS
Report dd bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report dd translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
The full documentation for dd is maintained as a Texinfo manual. If the info and dd programs are properly installed at your site, the com-
mand
info coreutils 'dd invocation'
should give you access to the complete manual.
GNU coreutils 8.12.197-032bb September 2011 DD(1)