pattern3) commands2;; *) default commands;; esac bash shell中for命令的基本格式。 for var in list do commands done 环境变量IFS,叫作内部字段分隔符(internal field separator)。 如设置换行符为分隔符:IFS=$'\n' C的for命令 格式 for (( variable assignment ; condition ; iteration process )),如:...
1976年,Stephen Bourne 结合 Mashey shell 的功能,重写一个新的 Shell,称为 Bourne shell。 1978年,加州大学伯克利分校的 Bill Joy 开发了 C shell,为 Shell 提供 C 语言的语法,程序名是csh。它是第一个真正替代sh的UNIX shell,被合并到 Berkeley UNIX 的 2BSD 版本中。 1979年,UNIX 第七版发布,内置了 Bo...
$ su -c 'echo hello' su: only the superuser may specify a login class 在这里,-c 是用于指定 login-class[16]。如果你想要传递 -c 'some command' 给 shell,最好在之前显示地指定 username: $ su root -c 'some command' # Now it's right. 19. cd /foo; bar 如果你不检查 cd 命令执行...
simply, type fg . This will bring the background job (vim) back again. Note that the process is paused, so if you’re running something like tail on a file, the process will have some catching up to do. If you have multiple jobs running in the background fg 3 , for example, will...
Supports multiple languages and many bash commands Cloudup A tool that facilitates backing up github repositories to bitbucket If you have ever felt the fear of the github unicorn this could be your savior Furthermore you can backup the repositories of any github user to your bitbucket. ...
# Use bash for the shell SHELL ["/bin/bash", "-o", "pipefail", "-c"] # Create a script file sourced by both interactive and non-interactive bash shells ENV BASH_ENV /home/user/.bash_env RUN touch "${BASH_ENV}" RUN echo '. "${BASH_ENV}"' >> ~/.bashrc # Download and ...
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...
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 if 后面紧跟...
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...
commands. b or ^B or ESC-v Scroll backward N lines, default one window (see option -z below). If N is more than the screen size, only the final screenful is displayed. w Like ESC-v, but if N is specified, it becomes the new window size. ...