Linux tips

add remove program from boot order?

To remove a program from boot in the ubuntu run the command:

update-rc.d -f program_name remove

To add again run the command:

update-rc.d -f program_name default

Get the disk uuid?

To get the partitions uuid use the blkid, tune2fs and lshw commands:

blkid or blkid /dev/sda1
tune2fs -l /dev/sdb1
lshw -class disk
ls -la /dev/disk/by-uuid

Find a open prgram using a socket or port?

run the lsof listing open files:

lsof -i :port will show the process running on this port.
lsof -U for linux open sokets.
lsof -i for network sockets
lsof -i tcp listing open tcp ports.
lsof -c c will show open processes starting with c.
lsof +d s list all directories s.
losf -N This option selects the listing of NFS files.
lsof -R This option directs lsof to list the Parent Process IDentifi‐ cation number in the PPID column.

Run the netstat command to show occupied ports:

netstat -tulpn

The above command will show the pid of process listening on port, run the command below to show the program:

ls -l /proc/pid_of_process/exe

The command fuser will show the user using this file read the man of fuser fro more details.
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How to sync to directories.

Use rsync to sync to directories, the command below will copy the directory a to the local directory:

raync -uvEr /a ./

The command below will sync two a local directories:

rsync -uvEr --delete /a/ a

To sync two remote dirs:

rsync -v -u -P -s -z --rsh=/usr/local/bin/ssh \
--r--times --perms --links --delete \
--exclude "*bak" --exclude "*~" \
/www/* webserver:simple_path_name

For local dirs don't uset the -z (--compress).
To dwonlaod files from the remote dir:

rasync -av --exclude-from=FILE --include-from=FILE --files-from=FILE

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