gcc is a GNU project C and C++ compiler for Linux, UNIX, FreeBSD etc. From the wikipedia:
GCC is a key component of the GNU toolchain. As well as being the official compiler of the GNU system, GCC has been adopted as the standard compiler by most other modern Unix-like computer operating systems, including Linux, the BSD family and Mac OS X. GCC has been ported to a wide variety of computer architectures, and is widely deployed as a tool in commercial and closed development environments.
Common gcc options:
cc -E :preprocessor
cc -S :create or show assembly coding
cc -o :object filename
cc -g :debug info
cc -O :optimized code
cc -O2 :optimized code with optimization level increased
cc -Wall :create or show all warning
cc -D_SYMBOL_ : Symbol for prerpcessor
You can use gcc instead of cc.
Pre login banner is use for sending a warning message before authentication may be relevant for getting legal protection or just give out information to users. The contents of the specified file are sent to the remote user before authentication is allowed. This option is only available for protocol version 2. By default, no banner is displayed (if you are using latest version of Linux/UNIX then you do not have to worry about version issue).
Procedure to change OpenSSH pre login banner
1) By default sshd server turns off this feature.
2) Login as the root user; create your login banner file:
# vi /etc/ssh/sshd-banner
Welcome to nixCraft Remote Login!
3) Open sshd configuration file /etc/sshd/sshd_config using a text editor:
# vi /etc/sshd/sshd_config
4) Add/edit the following line:
5) Save file and restart the sshd server:
# /etc/init.d/sshd restart
6) Test your new banner (from Linux or UNIX workstation or use any other ssh client):
$ ssh email@example.com
Welcome to nixCraft Labs!
vivek@ rh3es.nixcraft.org’s password:
Please note that this feature may not work with third party ssh client such as Putty.
All files accessible in a Linux (and UNIX) system are arranged in one big tree, the file hierarchy, rooted at /. These files can be spread out over several devices. The mount command serves to attach the file system found on some device to the big file tree.
Use the mount command to mount remote windows partition or windows share under Linux as follows:
Procedure to mount remote windows partition (NAS share)
1) Make sure you have following information:
==> Windows username and password to access share name
==> Sharename (such as //server/share) or IP address
==> root level access on Linux
2) Login to Linux as a root user (or use su command)
3) Create the required mount point:
# mkdir -p /mnt/ntserver
4) Use the mount command as follows:
# mount -t cifs //ntserver/download -o username=vivek,password=myPassword /mnt/ntserver
Use following command if you are using Old version such as RHEL <=4 or Debian <= 3:
# mount -t smbfs -o username=vivek,password=D1W4x9sw //ntserver/download /mnt/ntserver
5) Access Windows 2003/2000/NT share using cd and ls command:
# cd /mnt/ntserver; ls -l
- -t smbfs : File system type to be mount (outdated, use cifs)
- -t cifs : File system type to be mount
- -o : are options passed to mount command, in this example I had passed two options. First argument is password (vivek) and second argument is password to connect remote windows box
- //ntserver/download : Windows 2000/NT share name
- /mnt/ntserver Linux mount point (to access share after mounting)
Updated for accuracy on Aug-8-2007, 8:19PM.