Monthly Archive for June, 2010

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GIT Version Control System

GIT is one of the best systems for version control. I don’t want talk about benefits or other things now. I tell you how to work with GIT and do really useful things with it. Very simple installation and a list of frequently used commands:







Install GIT: (You see It’s very easy)

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aptitude update ; aptitude install git-core

Create new git repository:

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git init

Add all changes to repository:

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git add .

Consolidation of all changes:

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git commit -a

Consolidation of all changes with commit message:

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git commit -a -m "Commit Message"

Revert last commit:

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git reset --soft HEAD^

Current working directory status:

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git status

Diff since last commit:

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git diff

Add link to remote repository:

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git remote add origin ssh://id@gitcher/opt/repository

Remove link to remote repository:

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git remote rm origin

Get all new versions from source(remote repository):

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git pull origin master

Push all new changes to source(remote repository):

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git push origin master

Create new working tree(branch):

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git branch branch_name

Change between branches:

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git checkout branch_name

Merge braches:

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git merge branch_name

Delete branch:

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git branch -d branch_name

Remove branch force:

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git branch -D branch_name





And more complicated examples
Create local working space and push all changes to remote repository:

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git init
touch Initial_File
git add Initial_File
git commit -a -m "Initial commit"
git remote add origin ssh://id@gitcher/opt/repository
git push origin master



Create brach, edit and merge:

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git init
git branch test
git checkout test
# ...
# add changes
# ...
git commit -a -m "Branch commit"
git checkout
git merge test
git branch -d test

Messed up the commit message? This will let you re-enter it:

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git commit --amend

What run level am I in?

Q: How can I find out what run level a system is in at the moment?

1. The runlevel command tells you what run level is running
2. The who -r command also tells you the run level

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firewall ~ # /sbin/runlevel
N 2

or

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firewall ~ # who -r
         run-level 2  2010-05-28 23:13

Tcpdump to file

Very easy dumping of traffic with the w flag. You can use it for screen and later for wireshark analyses.

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tcpdump -w http_traffic -n -i any port 80

MySQL output pipe to file

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SELECT password FROM vb_user INTO OUTFILE '/tmp/pwds.csv' FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\n';