Search results
Results from the WOW.Com Content Network
In either case, the shell redirects I/O appropriately, and sends the SIGCONT signal to the process, which causes the operating system to resume its execution. In Bash, a program can be started as a background job by appending an ampersand (&) to the command line; its output is directed to the terminal (potentially interleaved with other ...
If the process receiving SIGHUP is a Unix shell, then as part of job control it will often intercept the signal and ensure that all stopped processes are continued before sending the signal to child processes (more precisely, process groups, represented internally by the shell as a "job"), which by default terminates them.
A sysctl option needs to be set to enable this function. [11] The Linux daemons sysrqd [12] and tcpconsole [13] provide a method of accessing SysRq features over a TCP connection after authenticating with a plain-text password. The hangwatch [14] daemon will invoke pre-configured SysRq triggers when system load average exceeds a certain threshold.
In the lower right we can see a terminal emulator running a Unix shell, in which the user can type commands as if they were sitting at a terminal. In computing , a shell is a computer program that exposes an operating system 's services to a human user or other programs.
Background execution allows a shell to run a command without user interaction in the terminal, freeing the command line for additional work with the shell. POSIX shells and other Unix shells allow background execution by using the & character at the end of command. In PowerShell, the Start-Process [43] or Start-Job [44] cmdlets can be used.
tcsh and sh shell windows on a Mac OS X Leopard [1] desktop. A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using ...
The Bash command-line completion system is very flexible and customizable, and is often packaged with functions that complete arguments and filenames for specific programs and tasks. Bash's syntax has many extensions lacking in the Bourne shell. Bash can perform integer calculations ("arithmetic evaluation") without spawning external processes.
Screenshot of a sample Bash session in GNOME Terminal 3, Fedora 15 Screenshot of Windows PowerShell 1.0, running on Windows Vista. A command-line interface (CLI) is a means of interacting with a computer program by inputting lines of text called command lines.