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sudo is unable to pipe the standard output to a file. By dumping its stdout stream into /dev/null , we also suppress the mirrored output in the console. The command above gives the current user root access to a server over ssh, by installing the user's public key to the server's key authorization list.
Others (such as many Unix media players) may read files from standard input. Popular Windows programs that open a separate console window in addition to their GUI windows are the emulators pSX and DOSBox. GTK-server can use stdin as a communication interface with an interpreted program to realize a GUI.
File descriptors for a single process, file table and inode table. Note that multiple file descriptors can refer to the same file table entry (e.g., as a result of the dup system call [3]: 104 ) and that multiple file table entries can in turn refer to the same inode (if it has been opened multiple times; the table is still simplified because it represents inodes by file names, even though an ...
The most common syntax for here documents, originating in Unix shells, is << followed by a delimiting identifier (often the word EOF or END [2]), followed, starting on the next line, by the text to be quoted, and then closed by the same delimiting identifier on its own line.
Alternatively, if the drain does not need to read any input from stdin to do something useful, it can be given < /dev/null as input. As all components of a pipe are run in parallel, a shell typically forks a subprocess (a subshell) to handle its contents, making it impossible to propagate variable changes to the outside shell environment.
Tesla stock fell as the stock's post-election gains faded amid a cooling of the Trump trade and a new report from Reuters that suggested EV tax credits could be cut under the incoming Trump ...
Participants who had 5 or more servings of dark chocolate each week were at a 21% reduced risk for type 2 diabetes. There was a 3% reduction per serving a week of dark chocolate. The observed ...
This is because the redirection form opens the file as the stdin file descriptor which command can fully access, while the cat form simply provides the data as a stream of bytes. Another common case where cat is unnecessary is where a command defaults to operating on stdin, but will read from a file, if the filename is given as an argument ...