Swap is divided into one or two G's, and boot is divided into 100 to 200m. Anything else is optional if necessary.
Bt3u USB flash drive is started, and the USB flash drive is set in bios, but I went into unknowkeywordinsyslinux.cfg?
The linux startup parameter file syslinux.cfg in the USB flash drive contains illegal characters. He writes very clearly. Copy syslinux.cfg from bt3 disk to the directory corresponding to the U disk again. If not, you can only copy the file from bt3 disk to the directory corresponding to the U disk.
What does linuxc contain?
Linux: The library editor and compiler are installed separately, using flexible windows: generally, it is an integrated development environment, which contains the above things. C has a standard library, which is the same, but the others are not necessarily the same. The library under linux can be installed in the system when you need it, and there are related documents showing that there is c++ under linux. In fact, there is a very powerful glibc library under linux, which repackages C and can be directly used for object-oriented development.
Four parameters of c language selection function?
Introduction to selection function parameters:
The first parameter nfds in Linux refers to the file descriptor+1 with the highest number, and its type is int. Under Windows, this parameter can be ignored and can be any value.
The second parameter, readfds, is optional. If it is not empty, select will return a value greater than 0, indicating that the file is readable. If there is no readable file, it is judged whether to time out according to the value of the timeout parameter. If it times out, select returns 0; If an error occurs, a negative value is returned.
The third parameter, writefds, is optional. If it is not null, select will return a value greater than 0, indicating that there is a file to write. If there is no writable file, the timeout will be judged according to the value of the timeout parameter. If it times out, select returns 0; If an error occurs, a negative value is returned.
The fourth parameter exceptfds is optional. If it is not empty, select returns a value greater than 0, indicating that an exception has occurred in the file collection; If there is no exception, it is judged whether to time out according to the value of the timeout parameter. If it times out, select returns 0; If an error occurs, a negative value is returned.
The fifth parameter timeout is optional. If it is not empty, it is used to set the timeout; Otherwise, it is waiting for timeout. If null, select will be set to blocking state, and the result will not be returned until a file descriptor in the file descriptor set changes.
What's the difference between zcvf and czvf in linux?
There is no difference between czvf and zcvf, and the parameter position of tar packaging command can be changed at will.
Zxvf is the command to decompress the package, and zcvf is the command to package the package.
Compression and packaging tools on Unix and Unix-like systems can combine multiple files into one file, and the suffix of the packaged file is also "tar". The tar file format has become the POSIX standard, initially POSIX. 1- 1988, and now it is POSIX. 1-200 1. This program was originally designed to back up files to tapearchive, hence the name tar.