bogon:~ Mac$ man kill KILL(1) BSD General Commands Manual KILL(1) NAME kill-- terminate or signal a process SYNOPSIS kill[-ssignal_name]pid... kill-l[exit_status] kill-signal_namepid... kill-signal_numberpid... DESCRIPTION Thekillutility sends a signal to the processes specified by t...
进入命令行环境以后,一般就已经打开Bash 了。如果你的 Shell 不是 Bash,可以输入bash命令启动Bash。 $ bash 退出Bash 环境,可以使用exit命令,也可以同时按下Ctrl + d。 $ exit Bash 的基本用法就是在命令行输入各种命令,非常直观。作为练习,可以试着输入pwd命令。按下回车键,就会显示当前所在的目录。 $ pwd /...
baz bat ... # Lots of commands. 出错时,cd 命令会报告无法改变当前目录,同时将错误消息输出到标准错误,例如 "bash: cd: /foo: No such file or directory"。如果你想要在标准输出同时输出自定义的错误提示,可以使用复合命令(command grouping[17]): cd /net || { echo "Can't read /net. Make sure...
exec 是一个在Bash Shell脚本中使用的命令，它允许您替换当前进程的内容，包括进程ID和文件描述符。使用...
ifCOMMANDSthen<COMMANDS>elif<COMMANDS># optional then<COMMANDS>else<COMMANDS># optional fi # required 再次强调,[是一个命令,它同其它常规的命令一样接受参数。if 是一个复合命令,它包含其它命令,[并不是 if 语法中的一部分。 如果你想根据 grep 命令的结果来做事情,你不需要把 grep 放到 [里面,只需要在...
Using the Up arrow key multiple times in a row moves you back multiple commands. Use the Down arrow key to move to later commands. Now you should see something like the following output. It lets you know that your command worked correctly to list files that matched the given pattern. Outp...
However, during the seven executions of thedatecommands, the current time is always changing, and we could get unexpected results. Further, we’ll execute thedatecommand seven times. If the command were an expensive process, the multiple assignments would definitely hurt the performance. ...
OPTIONS In addition to the single-character shell options documented in the description of the set builtin command, bash inter- prets the following options when it is invoked: -c string If the -c option is present, then commands are read from string. If there are arguments after the string...
eval Used to evaluate multiple commands or arguments are once. ex Interactive command exec An interactive line-based text editor. exit Exit from the terminal. expand Convert tabs into spaces in a given file and show the output. expect An extension to the Tcl script, it’s used to automate ...
Redirection and pipelines are two other important concepts in Bash. Redirection allows you to control the input and output of a command, while pipelines allow you to chain multiple commands together. For example, you can use the “>” symbol toredirectthe output of a command to a file, and...