$ nc -l 9999Create TCP Client:
$ nc -vt 192.168.5.12 9999 Ncat: Version 6.40 ( http://nmap.org/ncat ) Ncat: Connected to 192.168.5.12:9999.
$ nc -ul 9999Create UDP Client:
$ nc -vu 192.168.5.12 9999 Ncat: Version 6.40 ( http://nmap.org/ncat ) Ncat: Connected to 192.168.5.12:9999.Test UDP Connection only:
$ nc -zvu 192.168.5.12 9999 Connection to 192.168.5.12 9999 port [udp/*] succeeded!
sysctl -w [parameter] = [value]
Example:
sysctl -w kernel.sysrq="1"
This only works for testing purposes. Special settings within /proc/sys/ are lost when the
machine is rebooted. To preserve custom settings, add them to the /etc/sysctl.conf file.
Each time the system boots, the init program runs the /etc/rc.d/rc.sysinit script.
This script contains a command to execute sysctl using /etc/sysctl.conf to determine the
values passed to the kernel.
ENOSPC returns from msgget indicates that the system-wide maximum number of message queues has been reached./proc/sys/kernel/msgmni$ uname -iIt will respond with one of the following:
i386i386 = 32 bits
x86_64x86_64 = 64 bits
fcThis open the default editor with the command to edit inside.
fc -e vimIf you are inside the editor and you no longer want to execute the command, just quit without saving. For vim editor type :cq.
:cqIf you want to edit a command that is some lines up of the history list, first use the option -l to show the command list with the line numbers. Then execute fc plus the line number of the command you want to edit. For example:
$ fc -l 994 ls 995 vim main.cpp 996 set -o vi 997 clear 998 cat myexample.txt 999 cd .. 1000 set -o emacs 1001 ls -l 1002 fc -l 1003 rm 1004 ls -l 1005 vim test.txt 1006 cd Development 1007 rm mytest 1008 fc -l 1009 mv mytest.txt sometest
$ fc -e vim 998The former will open the vim editor with the command cat myexample.txt wainting to be edited.
git checkout master git reset --hard [Tag Code] git push --force origin masterWhere:
screen -R [session]This will start a new session with name [session](if not created before) in a new clean "screen".
screen -R [session]To list all the screen sessions:
screen -lsTo kill the current screen:
$ history 5 510 cp /home/pepito/myfile /home/pepito/myfolder 511 ls 512 ip addr show 513 ifconfig 514 history 5
$ !511 ls example.txt
$ sudo route del -net 192.168.5.0 SIOCDELRT: No such processThis gives you a successful output, because the mask is properly specified:
$ sudo route del -net 192.168.5.0/24
$ git diff --cached --name-only --diff-filter=ADetails:
$ find . -maxdepth 1 -not -name [file/directory_name] -exec rm -R {} \;
Where:$ find . -maxdepth 1 -not -name [file/directory_name]If you want to keep more than one file/directory, execute:
$ find . -maxdepth 1 -not -name [file_1/directory_name_1] \
-and -not -name [file_2/directory_name_2] -exec rm -R {} \;
Where:$ git fetch origin [Your remote branch]fetch does not change anything in your local repository, only updates the information against the branch selected.
$ git diff origin/[Your remote branch]
$ git checkout -b [New Branch]If you have modified or created files, add them to the project:
$ git add [Your modified or new files]Commit your changes:
$ git commit -m '[Your Comments]'Push the project to the new branch:
$ git push origin [New Branch]
$ sudo odbcinst -u -d -n [Driver_name] FreeTDS has been deleted (if it existed at all) because its usage count became zero
$ odbcinst -u -s -n [your_DSN_name] odbcinst: DSN removed (if it existed at all). ODBC_BOTH_DSN was used as the search path.
wget https://download.sublimetext.com/sublime_text_3_build_3114_x64.tar.bz2Uncompress tarball:
sudo tar vxjf sublime_text_3_build_3114_x64.tar.bz2Move sublime directory to /opt:
sudo mv sublime_text_3 /opt/Create symbolic link to sublime:
sudo ln -s /opt/sublime_text_3/sublime_text /usr/bin/sublimeExecute sublime and enjoy!:
sublime
git remote remove origin- Add current project to a branch:
git remote add origin [remote repository]- Clone a specific branch:
git clone -b [branch] [remote repository]
$ git status2. Add all files to the project:
$ git add -Athe -A option means track all including deleted files.
$ git commit -m "[Comments]"the -m option gives you the possibility to add your comments in the same line.
$ git push -u origin masterThe -u is optional and what it does is sets your local repo to a central one in order to, in the next time, git knows where to push and pull from.
Use the tee command: $| tee [OUTPUT.FILE][COMMAND]
Where: [COMMAND] is the command you want to execute.
[OUTPUT.FILE] is the file you want to write in. Variation for writing the standard error output: $2>&1 | tee[COMMAND][OUTPUT.FILE]
Where: [COMMAND] is the command you want to execute. [OUTPUT.FILE] is the file you want to write in.2>&1 redirects stderr(2) to stdout(1). Notes:is different that2>&1.2>1
2>1 means writing to a file with name 1 and 2>&1 means write to the standard output.# chown -R username:groupname *will change username and groupname on all files and subdirectories recursively(all subdirectories which are inside subdirectories and all files inside them).
/etc/ssh/sshd_config, change:
PermitRootLogin without-password
PermitRootLogin yes
sudo service ssh restart
ssh-keygen (stick to the default for the key, and skip the password if you feel like it). Then do sudo -s (or whatever your preferred method of becoming root is), and add an SSH key to /root/.ssh/authorized_keys:
cat /home/user/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
in some case after change,PermitRootLogin yesmust check this config :DenyUsers root AllowUsers saeidand to enable login must change to :#DenyUsers root AllowUsers root OtherUser
Example:
To find files older than 360 minutes ago:
find $PATH -name $FILES -type f -mmin +360
