tail


Pull all Git repositories you have access to

ssh [email protected] info | cut -f 2 | tail -n +3 | xargs -I {} -n 1 -I_repository -- sh -c 'cd _repository; git pull; cd ..;'

The above command will connect to the git server (git.bytefreaks.net) using  gitolite and get a list of all the repositories you have access to using ssh [email protected] info

The command should return a list similar to this:

hello bytefreaks, this is [email protected] running gitolite3 v3.5.3.1-1-gf8776f5 on git 1.7.1

 R W	Repo1
 R W	Repo2
 R W	Repo3
 R  	Repo4

From the results, we remove the first 3 lines as they contain no useful information to cloning all the repositories. From the rest of the lines, where each line contains the information for a repository we have access to, we keep the third column only as it is the one that holds the repository name as it is stored on the server.

Afterwards it will remove all columns except the second to filter the column with the repository names and will remove the first 3 lines to keep only the data we are interested in.

On the last stage of the pipe we have a list of the names of the repositories, using xargs, we assign each repository name to the _repository variable and using one result at a time, we navigate into the folder of the repository using cd and call the pull command.

Note: We assume that all repositories are in the current folder as children and each one is in a sub-folder of its own which is named as the repository is.

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Clone all repositories you have access to over ssh

ssh [email protected] info | cut -f 2 | tail -n +3 | xargs -I {} -n 1 git clone ssh://[email protected]/{}

The above command will connect to the git server (git.bytefreaks.net) that is using  gitolite and get a list of all the repositories you have access to using ssh [email protected] info

The command should return a list similar to this:

hello bytefreaks, this is [email protected] running gitolite3 v3.5.3.1-1-gf8776f5 on git 1.7.1

 R W	Repo1
 R W	Repo2
 R W	Repo3
 R  	Repo4

From the results, we remove the first 3 lines as they contain no useful information to cloning all the repositories. From the rest of the lines, where each line contains the information for a repository we have access to, we keep the third column only as it is the one that holds the repository name as it is stored on the server.

On the last stage of the pipe we have a list of the names of the repositories, using xargs, we assign each repository name to the special variable {} and processing one result at a time we clone the git repository to the current directory under the folder that is named as the repository.


Bash: Close a range of open sockets by killing the PIDs that are holding them open

Sometimes you want to use a specific port number but some other process(es) is using it. To get the control of the port you need to terminate all other processes and free it.
To find out which process(es) you need to kill, use lsof -i :port. It will return a list of each command and PID that is using the specific port. After that kill those PID using kill -s 9.

The following script will accept a range of ports to free, and for each it will try to kill all processes that are holding them blocked.

low=12345;
high=12350;
for i in `seq $low $high`; do
  lsof -i :$i | tail -n +2 | awk '{system("kill -s 9 " $2)}';
done

Using tail -n +2 we skip the first line of the input which would be the header information.
The system method will invoke a new sh shell and execute the command in it.
Using kill -s 9 we signal the processes that they have to terminate immediately.