Posts Tagged ‘command’
How to checkout from cvs
Posted on: August 6, 2010
- In: linux | ubuntu
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how to checkout from cvs from command line.
First set the CVSROOT environment variable. In our case, let the CVSROOT be
CVSROOT = :pserver:vignesh.prabhu@cvs:/opt/cvs/reps/mmp3000
Now login to the cvs server using the following command:
$cvs login
This will prompt you for your account password. After you have successfully authenticated with password, you can checkout from the cvs server using the following command:
cvs co -r tag10 project/sub_project
where tag10 is the tag from which you want to checkout
and project/sub_project is the part of the project which you want to start checkout.
If you directly want to checkout from HEAD, then use the following command:
cvs co project/sub_project
split and join huge files
Posted on: January 13, 2010
- In: linux | Misc | tech
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I recently has asked my friend to download edubuntu9.10 iso . It was a 3.4 gb iso. After he finished downloading when i had to transfer it to my system, we faced a small problem. His LAN card was not working and we had only 1gb pen drive. So the only option we had was to split the iso into files of size 1gb and then transfer them using pen drive.
command to split a huge file into smaller file.
split -b 1G
is the prefix of the smaller files that will be created.
After I split the files, i transfered each file in to my system and then joined the files using a very simple “cat” command.
Join the files splitted by the above commad.
$cat aa bb cc dd>huge-filename
The above command will join all the files and create the file huge-filename.
I need to test whether the order of the smaller files matters in the cat command. Logic says that it should matter. lemme check it out.
Confirmed it. The order of the smaller files is very importent to get back the original file.
Using sed
Posted on: November 9, 2009
- In: tech
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How to use sed command to remove lines from a file which match a particular pattern.
sed ‘//d’ file-name > tmp
This command will delete all the lines from the file which match the pattern and then store the contents in the ‘tmp’ file.
How to use sed command to substitute strings which match a pattern and then replace it with another string?
sed -e ‘s///’
This command is to match a string and replace it with another string. The new contents of the will be stored in
How to use a pattern matched in sed command also in the replaced string?
Use & to substitute the matched string.
cd // ??
Posted on: July 17, 2009
- In: Uncategorized
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I executed the following command by mistake instead of “cd ..”
- cd //
and strangely i was in some folder //
When I tried the command “pwd” i got the output as “//”.
When I tried the command “ls” i got the same output as if it was the “/” directory.
When I tried the command “cd ..” I was in the same directory as happens in “/” directory.
So I could conclude that it is the same “/” directory. But its existence did not make any sense then.
how to extract a .tar.bz2 file?
Posted on: June 12, 2009
- In: Uncategorized
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@courtsey http://www.linuxforums.org/forum/linux-newbie/28238-how-can-i-extract-tar-bz2-file.html#post143394
bunzip2 .tar.bz2 which unzips to .tar
tar -tvf .tar (view contents in tar file)
tar -xvf .tar (extract contents in tar file)
How to add a man doc manually
Posted on: June 10, 2009
- In: linux
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you need to set the MANPATH variable to be able to access man pages which are not present in standard path. If for temporary purpose, you can just export MANPATH by the following command.
$export MANPATH=$MANPATH:/the/path/of/the/man/page/
Dont keep any space on either sides of “=” as it gives error as
“bash: export: `=’: not a valid identifier”.
To add permanently, you need to make changes in /etc/login.defs file. I am looking into it and will update this post as soon as i come to know of it
My 2 paisas 
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