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On Mac OS X, if invoked without the -s option, chsh displays a text file in the default editor (initially set to vim) allowing the user to change all of the features of their user account that they are permitted to change, the pathname of the shell being the name next to "Shell:". When the user quits vim, the changes made there are transferred ...
Version 4 AT&T UNIX true: Shell programming Mandatory Return true value Version 7 AT&T UNIX tsort: Text processing Mandatory Topological sort Version 7 AT&T UNIX tty: Misc Mandatory Return user's terminal name Version 1 AT&T UNIX type: Misc Optional (XSI) Displays how a name would be interpreted if used as a command ulimit: Misc Optional (XSI)
The command su, including the Unix permissions system and the setuid system call, was part of Version 1 Unix.Encrypted passwords appeared in Version 3. [5] The command is available as a separate package for Microsoft Windows as part of the UnxUtils collection of native Win32 ports of common GNU Unix-like utilities.
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.
chattr — Change file attributes on a Linux file system. chgrp — Change group of one or more files. chmod — Change mode of listed files. chown — Change owner of one or more files. chroot — Run command within a new root directory. chrt — Get/set a process' real-time scheduling policy and priority. chsh — Change your login shell ...
In Linux, if the script was executed by a regular user, the shell would attempt to execute the command rm -rf / as a regular user, and the command would fail. However, if the script was executed by the root user, then the command would likely succeed and the filesystem would be erased.
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On many systems, such as macOS and Red Hat Linux, csh is actually tcsh. Often one of the two files is either a hard link or a symbolic link to the other, so that either name refers to the same improved version of the C shell (although behavior may be altered depending on which name is used).