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tail -F /var/adm/messages To interrupt tail while it is monitoring, break-in with Ctrl+C. This command can be run "in the background" with &, see job control. If the user has a command's result to monitor, the watch command can be used. There is a GNU Emacs mode that emulates the functionality of tail -f, called auto-revert-tail-mode.
This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems.
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
(It may be possible to specify boot parameters which control the level of detail in the messages.) The booting process typically happens at a speed where individual messages scroll off the top of the screen before an operator can read/digest them. The dmesg command allows the review of such messages in a controlled manner after the system has ...
Many early versions of Unix and Plan 9 did not have this command, and documentation and books used sed instead: sed 5q filename. The example prints every line (implicit) and quits after the fifth. Equivalently, awk may be used to print the first five lines in a file: awk 'NR < 6' filename
nohup is a POSIX command which means "no hang up". Its purpose is to execute a command such that it ignores the HUP (hangup) signal and therefore does not stop when the user logs out. Output that would normally go to the terminal goes to a file called nohup.out, if it has not already been redirected.
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The most notable example is the cd command, which changes the working directory of the shell. Since each executable program runs in a separate process , and working directories are specific to each process, loading cd as an external program would not affect the working directory of the shell that loaded it.