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The test command in Unix evaluates the expression parameter. In most recent shell implementations, it is a shell builtin, even though the external version still exists.In the second form of the command, the [ ] (brackets) must be surrounded by blank spaces (this is because [is a program and POSIX compatible shells require a space between the program name and its arguments).
The command has a number of switches: a - number all lines; t - number lines with printable text only; n - no line numbering; string - number only those lines containing the regular expression defined in the string supplied. The default applied switch is t. nl also supports some command line options.
COMMAND.COM, the original Microsoft command line processor introduced on MS-DOS as well as Windows 9x, in 32-bit versions of NT-based Windows via NTVDM; cmd.exe, successor of COMMAND.COM introduced on OS/2 and Windows NT systems, although COMMAND.COM is still available in virtual DOS machines on IA-32 versions of those operating systems also.
Return the size of a file. SMNT RFC 959 Mount file structure. SPSV FTP Extension Allowing IP Forwarding (NATs) Use single port passive mode (only one TCP port number for both control connections and passive-mode data connections) STAT RFC 959 Returns information on the server status, including the status of the current connection STOR RFC 959
Curses is designed to facilitate GUI-like functionality on a text-only device, such as a PC running in console mode, a hardware ANSI terminal, a Telnet or SSH client, or similar. Curses-based software is software whose user interface is implemented through the curses library, or a compatible library (such as ncurses ).
xterm is the standard terminal emulator for the X Window System.It allows users to run programs which require a command-line interface.. If no particular program is specified, xterm runs the user's shell.
Any number of commands may be placed into the script file, and using a script file also avoids problems with shell escaping or substitutions. Such a script file may be made directly executable from the command line by prepending it with a " shebang line" containing the sed command and assigning the executable permission to the file.
A directory is a logical section of a file system used to hold files. Directories may also contain other directories. The cd command can be used to change into a subdirectory, move back into the parent directory, move all the way back to the root directory or move to any given directory.