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The chgrp (from change group) command may be used by unprivileged users on various operating systems to change the group associated with a file system object (such as a computer file, directory, or link) to one of which they are a member. A file system object has 3 sets of access permissions, one set for the owner, one set for the group and one ...
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Remove directory entries Version 1 AT&T UNIX rmdel: SCCS Optional (XSI) Remove a delta from an SCCS file PWB UNIX rmdir: Filesystem Mandatory Remove directories, if they are empty. Version 1 AT&T UNIX sact: SCCS Optional (XSI) Print current SCCS file-editing activity System III sccs: SCCS: Optional (XSI) Front end for the SCCS subsystem 4.3BSD sed
Where ./do_something is only executed if the cd (change directory) command was "successful" (returned an exit status of zero) and the echo command would only be executed if either the cd or the ./do_something command return an "error" (non-zero exit status). For all commands the exit status is stored in the special variable $?.
The original version of the TRIM command has been defined as a non-queued command by the T13 subcommittee, and consequently can incur massive execution penalty if used carelessly, e.g., if sent after each filesystem delete command. The non-queued nature of the command requires the driver to first wait for all outstanding commands to be finished ...
The original File Allocation Table file system has a per-file all-user read-only attribute. NTFS implemented in Microsoft Windows NT and its derivatives, use ACLs [1] to provide a complex set of permissions. OpenVMS uses a permission scheme similar to that of Unix. There are four categories (system, owner, group, and world) and four types of ...
If the "ns" cgroup was mounted, each namespace would also create a new group in the cgroup hierarchy. This was an experiment that was later judged to be a poor fit for the cgroups API, and removed from the kernel. Linux namespaces were inspired by the more general namespace functionality used heavily throughout Plan 9 from Bell Labs. [34]
The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state. It is often used to recover from freezes , or to reboot a computer without corrupting the filesystem . [ 1 ]