wc standard input bad file descriptor

The Unix command obtains input from the standard input device (stdin) By default, outputting the result to the standard output device (STDOUT) display. In general, the standard input device is the keyboard, the standard output device is the terminal,

Substitution is what. Shell when it encounters an expression that contains one or more special characters for substitution. Example: The following example enables printing to replace the value of the variable with its value. and "" is a new line to

Note: Different versions of Linux will differ, but they are very similarThe Linux command obtains the input from the standard input device (stdin) By default, outputting the result to the standard output device (STDOUT) display. In general, the

The Unix command obtains input from the standard input device (stdin) By default, outputting the result to the standard output device (STDOUT) display. In general, the standard input device is the keyboard, the standard output device is the terminal,

Date Displays the current time and date Cal displays the current month of the Calendar DF View the number of free memory on the disk in the available PWD print current working directory CD switch directory LS list Folder contents absolute path:

One of the most compelling questions for anyone writing kernel code is how to finish debugging. Because the kernel is a feature set that is not associated with a process, its code cannot be easily executed in the debugger and cannot be traced. This

The background work has been done in the last section of the simple processing, basically to achieve the function has been finished, the following back to the code to make an adjustment, write a bad place to comb a bit,Add appropriate comments to

The most complete sysctl. conf optimization solution in China There are various versions of the sysctl. conf optimization solution on the Internet, most of which are copied and copied, making new users confused. In order to solve this problem, I