Different commands can have different syntaxes. The most common format is 'command -a -b -c -d' or 'command -abcd'. Commands with long options will also support the syntax 'command --option --option2 --coption3'.
2
the command "display" brings up the ImageMagick program.
Just type "top" into the command line. It requires no arguments. To exit, press 'q'.
emerge is a Gentoo-specific command that downloads the source code to a program and compiles it.
Linux OS is : PS -ef
ps aux
Enter this command as root: "apachectl start"
That would be a semi-contradiction; the command line would need to be already running in order to enter a command. The name of the program that actually provides the command line is called a shell. There are many different shells available for Linux, including Bash, ash, C Shell, fish, ksh, zsh, and scsh.The default command shell is /bin/sh (not /bin/bash, note).
The c99 command is a wrapper program that actually calls 'cc'. This is the standard c compiler for Linux. Since other Unix based systems use a c99 command to call the compiler with the 1999 standards there is a similar command to do the same thing under Linux.
PuTTY is a program for Microsoft Windows that allows you to control a computer running a Linux or Unix-based operating system via SSH using a command-line interface.
Innumerable. Remember that any program on Linux can be launched from the command line, so there are as many commands as there are programs.
shutdown -r now