mkdir一次可创建多个目录: [root@localhost tmp]#mkdir-v {a,b}/{c,d}mkdir: cannot create directory ‘a/c’: No suchfileor directorymkdir: cannot create directory ‘a/d’: No suchfileor directorymkdir: cannot create directory ‘b/c’: No suchfileor directorymkdir: cannot create directory ...
-rw-r--r--. 1 BashShell BashShell 947 11月 6 2013 usage-and-command-line-arguments.noindent -rw-r--r--. 1 BashShell BashShell 302 11月 6 2013 use-file-descriptor-read -rw-r--r--. 1 BashShell BashShell 278 11月 6 2013 use-file-descriptor-write -rw-r--r--. 1 BashShell ...
$ lsfile1 STDOUT $ ls file1 file2 2> STDERR file1 $ cat STDERR ls: cannot access file2: No such file or directory 18.6. stdout to stderr It is also possible to redirect STDOUT and STDERR to the same file. In the next example we will redirect STDOUT to the same descriptor as S...
READ(2) Linux Programmer's Manual READ(2) NAME read - read from a file descriptor SYNOPSIS #include <unistd.h> ssize_t read(int fd, void *buf, size_t count); DESCRIPTION read() attempts to read up to count bytes from file descriptor fd into the buffer starting at buf. On files th...
BASH_XTRACEFD If set to an integer corresponding to a valid file descriptor, bash will write the trace output generated when set -x is enabled to that file descriptor. The file descriptor is closed when BASH_XTRACEFD is unset or assigned a new value. Unsetting BASH_XTRACEFD or assigning...
想了一下 cat <> file相当于cat 0<> file。之后在网上找到了如下信息:Use program <> file to open file for both reading and writing.I/O Redirection[j]<>filename # Open file "filename" for reading and writing, #+ and assign file descriptor "j" to it. # If "filename" does not ...
used to create a pseudoterminal master and slave pair. When a process opens /dev/ptmx, it gets a file descriptor for a pseu‐ doterminal master (PTM), and a pseudoterminal slave (PTS) device is created in the /dev/pts directory. Each file descriptor obtained by ...
The general format for appending output is: [n]>>word Redirecting Standard Output and Standard Error Bash allows both the standard output (file descriptor 1) and the standard error output (file descriptor 2) to be redirected to the file whose name is the expansion of word with this construct...
Open a file Descriptor and assign it to a file exec N<> FILE_PATH, we must try to use N >= 3 Use the file descriptor as COMMAND <&N Close the file descriptor exec N>&- Tip CHECK IF THE INPUT WAS FROM KEYBOARD OR A PIPE if [[ -t 0 ]]; then echo "Keyboard" else echo "...
“open files table”(图中橙色标识)存储这些file entry,以数组的形式线性管理。文件描述符(file descriptor)作为进程到open files table的指针,也就是open files table的下标索引,将每个进程与它所访问的文件关联起来了。 每个进程中都有一个file descriptor table管理当前进程所访问(openorcreate)的所有文件,文件...