1% 使用英语阅读 第3 单元(共 9 个单元) 已完成100 XP 8 分钟 若要了解 Bash,首先要了解 Bash 语法。 了解语法后,可以将其应用到你运行的每个 Bash 命令。 Bash 命令的完整语法如下: Bash command[options] [arguments] Bash 将其遇到的第一个字符串视为命令。 以下命令使用 Bash 的ls(表示“list”)命令...
Every command returns an exit code (return status or exit status). A successful command always returns 0 (zero-code), and a command that has failed returns a non-zero value (error code). Failure codes must be positive integers between 1 and 255....
CAT(1) User Commands CAT(1) NAME cat - concatenate files and print on the standard output SYNOPSIS cat [OPTION]... [FILE]... DESCRIPTION Concatenate FILE(s) to standard output. With no FILE, or when FILE is -, read standard input. -A, --show-all equivalent to -vET -b, --number...
Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for ...
Runtime equivalent of the classic static ldd command and because the system pldd command often fails to attach to a process random_select.sh - selects one of given args at random. Useful for sampling, running randomized subsets of large test suites etc. random_number.sh - prints a random ...
COMMAND:进程所对应的命令行名称,也就是启动的程序名。 3、结束进程:kill命令可通过进程ID(PID)给进程发信号,只能用进程的PID而不能用命令 要发送进程信号,你是进程的属主或登录为root用户。 $ kill 3940 -bash: kill: (3940) - Operation not permitted ...
其次，您将find -exec语法与xargs语法混合在一起。具体来说，命令末尾的{} +是您在find -exec中使用...
With a Perl regex, it doesn't have the command line option. It does, however, have the Q and E options, which mean "everything after Q and before E should not be escaped", thus making life much easier for doing an exact match. ...
The exit status of the wait command is printed. $? is an internal Bash variable that holds the exit status of the last command executed. If you run the script, it will print something like this: PID: 36353 Exit status: 0 Here’s an example using the -n option: #!/bin/bash sleep ...
Used to define an alias for a specific command. bg Run a job in background mode. bind Used to bind a keyboard sequence. break Used to exit from a running loop in script. cd Change the directory to another directory. command Run a specific command without the normal shell lookup. continue...