Linux 的浩瀚无垠,使人总能每次都提交与众不同的内容。这些内容不仅对他们的职业生涯很有用,同时也让他们增长知识。在此,我们就尝试这么去做,至于能取得多大的成功,就由我们的读者朋友们来判断吧。
在此,作为 shell 脚本的附加内容,在本文中我们将从面试的角度解读与 Linux Shell 相关的问题。
1.在 shell 脚本成功执行前,如何中断脚本执行?
解答:我们需要使用exit
命令来实现以上描述的情境。exit
命令被强制输出非0值时,脚本会报错并退出。在 Unix 环境下的 shell 脚本中,0值表示成功执行。因此,在脚本终止前执行一个不带引号的exit -1
命令将使脚本中止。
保存文件并执行。
从上面的脚本中可以清楚地看到,在exit -1
命令前,脚本执行得很好。
2.如何使用 Linux 命令来移除文件头?
解答:当我们需要删除文件中的指定行时,sed
命令可以用来解决该问题。
这个是用来删除文件头(文件的首行)的正确命令。
好吧,其实sed命令内建的-i
开关就可以干这活,就不需要重定向符了吧。
3. 你怎么检查一个文本文件中某一行的长度?
解答:sed
命令也可以用来查找文本文件中的某一行或者检查其长度。
sed -n ‘n p’ file.txt
可以解决,这里n
表示行号,p
打印出匹配内容(到标准输出),该命令通常与-n
命令行选项连用。那么,怎样来获取长度计数呢?很明显,我们需要通过管道输出给wc
命令来计算。
要得到文本文件‘linuxmi.txt’的第五行的长度,运行如下命令:
4. 可以在 Linux 系统上查看到所有非打印字符吗?你是怎么做到的?
解答:可以。可以在 Linux 中查看所有的非打印字符。要实现上面所讲的方案,我们需要vi
编辑器的帮助。怎样在vi
编辑器中显示非打印字符?
打开vi编辑器。
先按[esc]键,然后按:
进入到vi编辑器的命令模式。
最后,从 vi 编辑器的命令界面输入set list
命令并执行。
注: 这种方式可以查看文本文件中的所有非打印字符,包括 ctrl+m(^M)。
5. 假如你是一个员工组的团队领导,为xyz公司工作。公司要求你创建一个dir_xyz目录,让该组成员都能在该目录下创建或访问文件,但是除了文件创建者之外的其他人不能删除文件,你会怎么做?
解答:这真是个有趣的工作方案。好吧,上面所讲的方案,我们需要通过下面的步骤来实施,这简直就是小菜一碟。
第一行命令创建了一个目录(dir_xyz),上面的第二行命令让组(g)具有‘写’和‘执行’的权限,而上面的最后一行命令——权限位最后的‘+t’是‘粘滞位’,它用来替换‘x’,表明在这个目录中,文件只能被它们的拥有者、目录的拥有者或者是超级用户root删除。
6. 你能告诉我一个Linux进程经历的各个阶段吗?
解答:一个 Linux 进程在它的一生中,通常经历了四个主要阶段。
这里是Linux进程要经历的四个阶段。
-
等待:Linux进程等待资源。
-
运行:Linux进程当前正在执行中。
-
停止:Linux进程在成功执行后或收到杀死进程信号后停止。
-
僵尸:如果该进程已经结束,但仍然留在进程表中,被称为‘僵尸’。
7. Linux中cut命令怎么用?
解答:cut
是一个很有用的 Linux 命令,当我们要截取文件的指定部分并打印到标准输出,当文本区域以及文件本身很大时,这个命令很有用。
例如,截取txt_linuxmi
文件的前10列。
要截取该文件中的第二,第五和第七列。
8. cmp和diff命令的区别是什么?
解答:cmp
和diff
命令用来获取相同的东西,但各有侧重。
diff
命令输出为了使两个文件一样而应该做的修改。而‘cmp’命令则将两个文件逐字节对比,并报告第一个不匹配的项。
9. 可以用echo命令来替换ls命令吗?
解答:可以的。‘ls’命令可以用‘echo’命令来替代。‘ls’命令列出目录内容,从替换上述命令的角度讲,我们可以使用‘echo *’,两个命令的输出完全一样。
10. 你可能听过 inode 吧。你能简要描述一下 inode 吗?
解答:inode 是一个数据结构,在 Linux 上用于文件标识。每个文件在 Unix 系统上有一个独立的 inode 和一个唯一的 inode 号。
来源:Linux迷
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