/bin/bash : redirect all output to file exec {fd}>&1# duplicate stdout exec1> mmm2>&1dfdate+%c eval"exec 1>&$fd $fd<&-" 生成测试文件 测试脚本 #!/bin/bash if [ $#-lt1];then echo"Usage:`basename $0` file"exit5fi while read-r line;do echo $line read-p $'Press any key...
Programming - Communicating with chess engine stockfish / FIFOs / Bash redirections 3 Source a file template and output it with set variables 1 ssh to execute remote command under interactive shell 3 WSL2 Ubuntu: How to start ssh-agent and add ssh key automatically on each terminal start...
# Link file descriptor #6 with stdin. # Saves stdin. # stdin replaced by file "data-file" # Reads first line of file "data-file" # Reads second line of file "data-file" exec 6<&0 exec < data-file read a1 read a2 echo echo "Following lines read from file." echo "---" echo...
If the file descriptor number is omitted, and the first character of the redirection operator is <, the redirection refers to the standard input (file descriptor 0). If the first character of the redirection operator is >, the redirection refers to the standard output (file descriptor 1). Re...
fd:file descriptor,文件描述符; stdin: 0 stdout: 1 stderr: 2 IO重定向: 输出重定向: 重定向程序正常执行的结果 COMMAND > /PATH/TO/SOMEFILE 覆盖重定向:覆盖目标文件中的原有内容; COMMAND >> /PATH/TO/SOMEFILE 追加重定向:追加新产生的内容至目标文件尾部; ...
to be somewhat slower due to the nature of database searches. 1. 2. 3. 4. 5. 6. 7. whatis -w # cxxu @ CxxuWin11 in ~/.config/cheat [18:57:37] $ whatis-wfile* FILE (3)-overview of system data types file (1)-determine file type ...
Redirection allows commands' file handles to be duplicated, opened, closed, made to refer to different files, and can change the files the command reads from and writes to. If the file descriptor number is omitted, and the first character of the redirection operator is <, the redirection ref...
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 ...
than 10 and assign it to {varname}. If >&- or <&- is preceded by {varname}, the value ofvarnamedefines the file descriptor to close. If {varname} is supplied, the redirection persists beyond the scope of the command, allowing the shell programmer to manage the file descriptor ...
fd:file descriptor,文件描述符; stdin: 0 stdout: 1 stderr: 2 IO重定向: 输出重定向: 重定向程序正常执行的结果 COMMAND > /PATH/TO/SOMEFILE 覆盖重定向:覆盖目标文件中的原有内容; COMMAND >> /PATH/TO/SOMEFILE 追加重定向:追加新产生的内容至目标文件尾部; ...