🌹作者:云小逸
📝个人主页:云小逸的主页
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🤟motto:要敢于一个人默默的面对自己，强大自己才是核心。不要等到什么都没有了，才下定决心去做。种一颗树，最好的时间是十年前，其次就是现在！学会自己和解，与过去和解，努力爱自己。==希望春天来之前，我们一起面朝大海，春暖花开！==🤟
👏专栏：C++👏 👏专栏：Java语言👏
👏专栏：C语言初阶👏👏专栏：数据结构👏👏专栏：Liunx学习👏
文章目录
- 前言
-
- 7.man指令（重要）：
- 语法: man [选项] 命令
- 常用选项
- 8.cp指令（重要）：
- 语法：cp [选项] 源文件或目录 目标文件或目录
- 功能: 复制文件或目录
- 说明:
- 常用选项：
- 9.mv指令（重要）：
- 语法: mv [选项] 源文件或目录 目标文件或目录
- 功能:
- 常用选项：
- 举例：
- 10.cat
- 语法：cat [选项][文件]
- 功能： 查看目标文件的内容
- 常用选项：
- 举例：
- 11.more指令
- 语法：more [选项][文件]
- 功能：more命令，功能类似 cat
- 常用选项：
- 举例：
- 12.less指令（重要）
- 语法： less [参数] 文件
- 功能：
- 选项：
- 13.head指令
- 语法： head [参数]... [文件]...
- 功能：
- 选项：
- 14.tail指令
- 语法： tail[必要参数][选择参数][文件]
- 功能： 用于显示指定文件末尾内容，不指定文件时，作为输入信息进行处理。常用查看日志文件。
- 选项：
- 举例：（简单讲解重定向和管道）
- 【取前三和后三】
- 【输出中间三个】
- 1.临时文件的方案：
- 2.管道：
- 最后
-
前言
今天我们开始进行Linux知识的学习，这篇文章主要是承接上一篇文章【Linux常见指令大全（一）】继续书写Linux的基本指令！！！本系列的Linux的指令操作都是在云服务器上操作的。
——————————————————————————————
首先先写上几句话：献给坚持创作的我和点开这篇文章希望进步的你
1.无论你在寻找什么，亲情，友情，或爱情，终其一生，其实你都是一个人，极少有人能真正的像你一样理解你自己，哪怕是亲人，朋友或恋人，他们只能辅助你去理解自己，你唯一的人生课题就是找到自己。
2.不懂得爱自己的人，是没办法爱别人的。某些时候，怜悯不是爱，纵容不是爱，正确的爱是刚柔并济，褒贬具存的，是懒惰时的严厉，哭泣时的拥抱，懦弱时的鼓励，黑夜里的路灯。爱是让风筝飞行的风，是荒漠里久逢甘露，是戈壁滩种下的树，是暴风雨中飞翔的鸟，是你手中紧紧握住又愿意放出的风筝线，正确的爱不会让任何人痛苦，只会让你的精神和心灵在任何天气里都能走得更远站的更高。
3.有时候最大的伤害都来自于最亲近的人，但是你要记住你很好，而且做你自己就好，也不要怨恨，不要变成自己讨厌的样子，不要一直陷在怪圈里，对伤害最好的反击就是:让伤害到我为止。让伤害到我为止不是打碎牙往肚子里咽，而是我有能力消化离开，将我对美好未来的愿望积累，超过我对过去耿耿于怀的怨恨，不再执着责备，不愿耗费一分，可以忍着痛把它抹零，重新开始。理解过去的根源，消解过去的伤痛，和脱离这个怪圈。不计较是否解气是否公平是否委屈，有能忘却一切的决心和离开重新开始新的生活的勇气。
4.人生能真正有效改变自己的，只有为数不多的十来年，珍惜机遇，尤其是你还年轻的时候，比如读书。
5.每个人的生活都下了雪，尽量自己清扫自己的屋檐，体谅别人的辛苦，原谅偶尔的冷漠，没有人是永不疲惫的超人。但是如果可以，你要尽量力所能及做一个能温暖别人的人， 这种感觉也很好。
7.man指令（重要）：
Linux的命令有很多参数，我们不可能全记住，我们可以通过查看联机手册获取帮助。访问Linux手册页的命令是man
语法: man [选项] 命令
常用选项
-k 根据关键字搜索联机帮助
num 只在第num章节找
-a 将所有章节的都显示出来，比如 man printf 它缺省从第一章开始搜索，知道就停止，用a选项，当按 下q退出，他会继续往后面搜索，直到所有章节都搜索完毕。
解释一下,面手册分为8章
1 是普通的命令
2 是系统调用,如open,write之类的(通过这个，至少可以很方便的查到调用这个函数，需要加什么头文 件)
3 是库函数,如printf,fread
4是特殊文件,也就是/dev下的各种设备文件
5 是指文件的格式,比如passwd,
就会说明这个文件中各个字段的含义
6 是给游戏留的,由各个游戏自己定义
7 是附件还有一些变量,比如向environ这种全局变量在这里就有说明
8 是系统管理用的命令,这些命令只能由root使用,如ifconfig
1.man是一个查看命令，系统调用，C接口的一个手册！
2.手册是有编号的。
3.man默认是从1号手册开始查找，找到即停。
4.man可以根据指定手册查找man1/2/3------命令/接口/C
上面是Linux系统对man指令的解释【man man】
8.cp指令（重要）：
语法：cp [选项] 源文件或目录 目标文件或目录
功能: 复制文件或目录
说明:
cp指令用于复制文件或目录，如同时指定两个以上的文件或目录，且最后的目的地是一个已经存在的目录，
则它会把前面指定的所有文件或目录复制到此目录中。若同时指定多个文件或目录，而最后的目的地并非一个已存
在的目录，则会出现错误信息
常用选项：
-f 或 --force 强行复制文件或目录， 不论目的文件或目录是否已经存在
-i 或 --interactive 覆盖文件之前先询问用户
-r递归处理，将指定目录下的文件与子目录一并处理。若源文件或目录的形态，不属于目录或符号链 接，则一律视为普通文件处理8处理
cp 拷贝目录和文件，-r -f -i，同rm中的用法。
[root@VM-4-9-centos KongQing]# tree .
.
0 directories, 0 files
[root@VM-4-9-centos KongQing]# touch test.txt
[root@VM-4-9-centos KongQing]# mkdir a/b/c
mkdir: cannot create directory ‘a/b/c’: No such file or directory
[root@VM-4-9-centos KongQing]# tree .
.
`-- test.txt
0 directories, 1 file
[root@VM-4-9-centos KongQing]# mkdir -p a/b/c
[root@VM-4-9-centos KongQing]# tree .
.
|-- a
| `-- b
| `-- c
`-- test.txt
3 directories, 1 file
[root@VM-4-9-centos KongQing]# mkdir d
[root@VM-4-9-centos KongQing]# cp test.txt d
[root@VM-4-9-centos KongQing]# tree .
.
|-- a
| `-- b
| `-- c
|-- d
| `-- test.txt
`-- test.txt
4 directories, 2 files
[root@VM-4-9-centos KongQing]#
[root@VM-4-9-centos KongQing]#
[root@VM-4-9-centos KongQing]# cp d a
cp: omitting directory ‘d’
[root@VM-4-9-centos KongQing]# cp -rf d a
[root@VM-4-9-centos KongQing]# tree .
.
|-- a
| |-- b
| | `-- c
| `-- d
| `-- test.txt
|-- d
| `-- test.txt
`-- test.txt
5 directories, 3 files
[root@VM-4-9-centos KongQing]#
9.mv指令（重要）：
mv命令是move的缩写，可以用来移动文件或者将文件改名（move (rename) files），是Linux系统下常用的命
令，经常用来备份文件或者目录。
语法: mv [选项] 源文件或目录 目标文件或目录
功能:
- 视mv命令中第二个参数类型的不同（是目标文件还是目标目录），mv命令将文件重命名或将其移至一个新的
目录中。 - 当第二个参数类型是文件时，mv命令完成文件重命名，此时，源文件只能有一个（也可以是源目录名），它
将所给的源文件或目录重命名为给定的目标文件名。 - 当第二个参数是已存在的目录名称时，源文件或目录参数可以有多个，mv命令将各参数指定的源文件均移至
目标目录中。
1.类似剪切功能，move，移动文件或者目录
2.对文件或者目录进行重命名
常用选项：
-f ：force 强制的意思，如果目标文件已经存在，不会询问而直接覆盖
-i ：若目标文件 (destination) 已经存在时，就会询问是否覆盖
举例：
将rm改造成mv
vim ~/.bashrc #修改这个文件
mkdir -p ~/.trash
alias rm=trash
alias ur=undelfile
undelfile() {
mv -i ~/.trash/\$@ ./
}
trash() {
mv $@ ~/.trash/
}
[root@VM-4-9-centos KongQing]# tree .
.
0 directories, 0 files
[root@VM-4-9-centos KongQing]# touch test
[root@VM-4-9-centos KongQing]# mkdir a/b/c
mkdir: cannot create directory ‘a/b/c’: No such file or directory
[root@VM-4-9-centos KongQing]# mkdir -p a/b/c
[root@VM-4-9-centos KongQing]# tree .
.
|-- a
| `-- b
| `-- c
`-- test
3 directories, 1 file
[root@VM-4-9-centos KongQing]# mkdir s
[root@VM-4-9-centos KongQing]# mv test s
[root@VM-4-9-centos KongQing]# tree .
.
|-- a
| `-- b
| `-- c
`-- s
`-- test
4 directories, 1 file
[root@VM-4-9-centos KongQing]# mv s a
[root@VM-4-9-centos KongQing]# tree .
.
`-- a
|-- b
| `-- c
`-- s
`-- test
4 directories, 1 file
[root@VM-4-9-centos KongQing]#
10.cat
语法：cat [选项][文件]
功能： 查看目标文件的内容
常用选项：
-b 对非空输出行编号
-n 对输出的所有行编号
-s 不输出多行空行
举例：
# cnt=0; while [ $cnt -le 1000 ] ; do echo "hello 106 [$cnt]"; let cnt++; done > test.txt
打印一千行【hello 106】在test.txt文件里；
[root@VM-4-9-centos KongQing]# cnt=0; while [ $cnt -le 1000 ] ; do echo "hello 106 [$cnt]"; let cnt++; done > test.txt
[root@VM-4-9-centos KongQing]# cat test.txt
hello 106 [0]
hello 106 [1]
hello 106 [2]
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[root@VM-4-9-centos KongQing]# cat -n test.txt
1 hello 106 [0]
2 hello 106 [1]
3 hello 106 [2]
4 hello 106 [3]
5 hello 106 [4]
6 hello 106 [5]
7 hello 106 [6]
8 hello 106 [7]
9 hello 106 [8]
10 hello 106 [9]
11 hello 106 [10]
12 hello 106 [11]
13 hello 106 [12]
14 hello 106 [13]
15 hello 106 [14]
16 hello 106 [15]
17 hello 106 [16]
18 hello 106 [17]
19 hello 106 [18]
20 hello 106 [19]
21 hello 106 [20]
22 hello 106 [21]
23 hello 106 [22]
24 hello 106 [23]
25 hello 106 [24]
26 hello 106 [25]
27 hello 106 [26]
28 hello 106 [27]
29 hello 106 [28]
30 hello 106 [29]
31 hello 106 [30]
32 hello 106 [31]
33 hello 106 [32]
34 hello 106 [33]
35 hello 106 [34]
36 hello 106 [35]
37 hello 106 [36]
38 hello 106 [37]
39 hello 106 [38]
40 hello 106 [39]
41 hello 106 [40]
42 hello 106 [41]
43 hello 106 [42]
44 hello 106 [43]
45 hello 106 [44]
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47 hello 106 [46]
48 hello 106 [47]
49 hello 106 [48]
50 hello 106 [49]
51 hello 106 [50]
52 hello 106 [51]
53 hello 106 [52]
54 hello 106 [53]
55 hello 106 [54]
56 hello 106 [55]
57 hello 106 [56]
58 hello 106 [57]
59 hello 106 [58]
60 hello 106 [59]
61 hello 106 [60]
62 hello 106 [61]
63 hello 106 [62]
64 hello 106 [63]
65 hello 106 [64]
66 hello 106 [65]
67 hello 106 [66]
68 hello 106 [67]
69 hello 106 [68]
70 hello 106 [69]
71 hello 106 [70]
72 hello 106 [71]
73 hello 106 [72]
74 hello 106 [73]
75 hello 106 [74]
76 hello 106 [75]
77 hello 106 [76]
78 hello 106 [77]
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80 hello 106 [79]
81 hello 106 [80]
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84 hello 106 [83]
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90 hello 106 [89]
91 hello 106 [90]
92 hello 106 [91]
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94 hello 106 [93]
95 hello 106 [94]
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97 hello 106 [96]
98 hello 106 [97]
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100 hello 106 [99]
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120 hello 106 [119]
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125 hello 106 [124]
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165 hello 106 [164]
166 hello 106 [165]
167 hello 106 [166]
168 hello 106 [167]
169 hello 106 [168]
170 hello 106 [169]
171 hello 106 [170]
172 hello 106 [171]
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174 hello 106 [173]
175 hello 106 [174]
176 hello 106 [175]
177 hello 106 [176]
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180 hello 106 [179]
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198 hello 106 [197]
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210 hello 106 [209]
211 hello 106 [210]
212 hello 106 [211]
213 hello 106 [212]
214 hello 106 [213]
215 hello 106 [214]
216 hello 106 [215]
217 hello 106 [216]
218 hello 106 [217]
219 hello 106 [218]
220 hello 106 [219]
221 hello 106 [220]
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224 hello 106 [223]
225 hello 106 [224]
226 hello 106 [225]
227 hello 106 [226]
228 hello 106 [227]
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230 hello 106 [229]
231 hello 106 [230]
232 hello 106 [231]
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238 hello 106 [237]
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240 hello 106 [239]
241 hello 106 [240]
242 hello 106 [241]
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244 hello 106 [243]
245 hello 106 [244]
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250 hello 106 [249]
251 hello 106 [250]
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253 hello 106 [252]
254 hello 106 [253]
255 hello 106 [254]
256 hello 106 [255]
257 hello 106 [256]
258 hello 106 [257]
259 hello 106 [258]
260 hello 106 [259]
261 hello 106 [260]
262 hello 106 [261]
263 hello 106 [262]
264 hello 106 [263]
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266 hello 106 [265]
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268 hello 106 [267]
269 hello 106 [268]
270 hello 106 [269]
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275 hello 106 [274]
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298 hello 106 [297]
299 hello 106 [298]
300 hello 106 [299]
301 hello 106 [300]
302 hello 106 [301]
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304 hello 106 [303]
305 hello 106 [304]
306 hello 106 [305]
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308 hello 106 [307]
309 hello 106 [308]
310 hello 106 [309]
311 hello 106 [310]
312 hello 106 [311]
313 hello 106 [312]
314 hello 106 [313]
315 hello 106 [314]
316 hello 106 [315]
317 hello 106 [316]
318 hello 106 [317]
319 hello 106 [318]
320 hello 106 [319]
321 hello 106 [320]
322 hello 106 [321]
323 hello 106 [322]
324 hello 106 [323]
325 hello 106 [324]
326 hello 106 [325]
327 hello 106 [326]
328 hello 106 [327]
329 hello 106 [328]
330 hello 106 [329]
331 hello 106 [330]
332 hello 106 [331]
333 hello 106 [332]
334 hello 106 [333]
335 hello 106 [334]
336 hello 106 [335]
337 hello 106 [336]
338 hello 106 [337]
339 hello 106 [338]
340 hello 106 [339]
341 hello 106 [340]
342 hello 106 [341]
343 hello 106 [342]
344 hello 106 [343]
345 hello 106 [344]
346 hello 106 [345]
347 hello 106 [346]
348 hello 106 [347]
349 hello 106 [348]
350 hello 106 [349]
351 hello 106 [350]
352 hello 106 [351]
353 hello 106 [352]
354 hello 106 [353]
355 hello 106 [354]
356 hello 106 [355]
357 hello 106 [356]
358 hello 106 [357]
359 hello 106 [358]
360 hello 106 [359]
361 hello 106 [360]
362 hello 106 [361]
363 hello 106 [362]
364 hello 106 [363]
365 hello 106 [364]
366 hello 106 [365]
367 hello 106 [366]
368 hello 106 [367]
369 hello 106 [368]
370 hello 106 [369]
371 hello 106 [370]
372 hello 106 [371]
373 hello 106 [372]
374 hello 106 [373]
375 hello 106 [374]
376 hello 106 [375]
377 hello 106 [376]
378 hello 106 [377]
379 hello 106 [378]
380 hello 106 [379]
381 hello 106 [380]
382 hello 106 [381]
383 hello 106 [382]
384 hello 106 [383]
385 hello 106 [384]
386 hello 106 [385]
387 hello 106 [386]
388 hello 106 [387]
389 hello 106 [388]
390 hello 106 [389]
391 hello 106 [390]
392 hello 106 [391]
393 hello 106 [392]
394 hello 106 [393]
395 hello 106 [394]
396 hello 106 [395]
397 hello 106 [396]
398 hello 106 [397]
399 hello 106 [398]
400 hello 106 [399]
401 hello 106 [400]
402 hello 106 [401]
403 hello 106 [402]
404 hello 106 [403]
405 hello 106 [404]
406 hello 106 [405]
407 hello 106 [406]
408 hello 106 [407]
409 hello 106 [408]
410 hello 106 [409]
411 hello 106 [410]
412 hello 106 [411]
413 hello 106 [412]
414 hello 106 [413]
415 hello 106 [414]
416 hello 106 [415]
417 hello 106 [416]
418 hello 106 [417]
419 hello 106 [418]
420 hello 106 [419]
421 hello 106 [420]
422 hello 106 [421]
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424 hello 106 [423]
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427 hello 106 [426]
428 hello 106 [427]
429 hello 106 [428]
430 hello 106 [429]
431 hello 106 [430]
432 hello 106 [431]
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436 hello 106 [435]
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438 hello 106 [437]
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440 hello 106 [439]
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444 hello 106 [443]
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446 hello 106 [445]
447 hello 106 [446]
448 hello 106 [447]
449 hello 106 [448]
450 hello 106 [449]
451 hello 106 [450]
452 hello 106 [451]
453 hello 106 [452]
454 hello 106 [453]
455 hello 106 [454]
456 hello 106 [455]
457 hello 106 [456]
458 hello 106 [457]
459 hello 106 [458]
460 hello 106 [459]
461 hello 106 [460]
462 hello 106 [461]
463 hello 106 [462]
464 hello 106 [463]
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466 hello 106 [465]
467 hello 106 [466]
468 hello 106 [467]
469 hello 106 [468]
470 hello 106 [469]
471 hello 106 [470]
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480 hello 106 [479]
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484 hello 106 [483]
485 hello 106 [484]
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487 hello 106 [486]
488 hello 106 [487]
489 hello 106 [488]
490 hello 106 [489]
491 hello 106 [490]
492 hello 106 [491]
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494 hello 106 [493]
495 hello 106 [494]
496 hello 106 [495]
497 hello 106 [496]
498 hello 106 [497]
499 hello 106 [498]
500 hello 106 [499]
501 hello 106 [500]
502 hello 106 [501]
503 hello 106 [502]
504 hello 106 [503]
505 hello 106 [504]
506 hello 106 [505]
507 hello 106 [506]
508 hello 106 [507]
509 hello 106 [508]
510 hello 106 [509]
511 hello 106 [510]
512 hello 106 [511]
513 hello 106 [512]
514 hello 106 [513]
515 hello 106 [514]
516 hello 106 [515]
517 hello 106 [516]
518 hello 106 [517]
519 hello 106 [518]
520 hello 106 [519]
521 hello 106 [520]
522 hello 106 [521]
523 hello 106 [522]
524 hello 106 [523]
525 hello 106 [524]
526 hello 106 [525]
527 hello 106 [526]
528 hello 106 [527]
529 hello 106 [528]
530 hello 106 [529]
531 hello 106 [530]
532 hello 106 [531]
533 hello 106 [532]
534 hello 106 [533]
535 hello 106 [534]
536 hello 106 [535]
537 hello 106 [536]
538 hello 106 [537]
539 hello 106 [538]
540 hello 106 [539]
541 hello 106 [540]
542 hello 106 [541]
543 hello 106 [542]
544 hello 106 [543]
545 hello 106 [544]
546 hello 106 [545]
547 hello 106 [546]
548 hello 106 [547]
549 hello 106 [548]
550 hello 106 [549]
551 hello 106 [550]
552 hello 106 [551]
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555 hello 106 [554]
556 hello 106 [555]
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560 hello 106 [559]
561 hello 106 [560]
562 hello 106 [561]
563 hello 106 [562]
564 hello 106 [563]
565 hello 106 [564]
566 hello 106 [565]
567 hello 106 [566]
568 hello 106 [567]
569 hello 106 [568]
570 hello 106 [569]
571 hello 106 [570]
572 hello 106 [571]
573 hello 106 [572]
574 hello 106 [573]
575 hello 106 [574]
576 hello 106 [575]
577 hello 106 [576]
578 hello 106 [577]
579 hello 106 [578]
580 hello 106 [579]
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998 hello 106 [997]
999 hello 106 [998]
1000 hello 106 [999]
1001 hello 106 [1000]
[root@VM-4-9-centos KongQing]#
cat指令是从第一行打印文本内容！！！
tac是逆序打印文本内容
但是两者不还是会查看大文本，适合小文本或者代码片段！
11.more指令
语法：more [选项][文件]
功能：more命令，功能类似 cat
常用选项：
-n 对输出的所有行编号
q 退出more
举例：
[atong@LiWenTong ~]$ ls -l / | more
total 162
drwxr-xr-x 2 root root 4096 Apr 25 05:39 bin
drwxr-xr-x 4 root root 1024 Apr 25 04:11boot
drwxr-xr-x 9 root root 3820 May 4 23:20 dev
drwxr-xr-x 84 root root 4096 May 5 00:37 etc
[root@VM-4-9-centos KongQing]# more -10 test.txt
# 打印文本的前十行
hello 106 [0]
hello 106 [1]
hello 106 [2]
hello 106 [3]
hello 106 [4]
hello 106 [5]
hello 106 [6]
hello 106 [7]
hello 106 [8]
hello 106 [9]
--More--(0%)
12.less指令（重要）
less 工具也是对文件或其它输出进行分页显示的工具，应该说是linux正统查看文件内容的工具，功能极其强大。 less 的用法比起
more 更加的有弹性。在 more 的时候，我们并没有办法向前面翻， 只能往后面看 但若使用了 less 时，就可以使用
[pageup][pagedown] 等按键的功能来往前往后翻看文件，更容易用 来查看一个文件的内容！ 除此之外，在 less
里头可以拥有更多的搜索功能，不止可以向下搜，也可以向上搜
。
语法： less [参数] 文件
功能：
less与more类似，但使用less可以随意浏览文件，而more仅能向前移动，却不能向后移动，而且less在查看之前
不会加载整个文件。
选项：
-i 忽略搜索时的大小写
-N 显示每行的行号
/字符串：向下搜索“字符串”的功能
?字符串：向上搜索“字符串”的功能
n：重复前一个搜索（与 / 或 ? 有关）
N：反向重复前一个搜索（与 / 或 ? 有关） q:quit
less test.txt
使用less查看的时候，可以上下键进行查看
less和more适合查看大文本
可以在光标处输入/然后再输入你想查找的东西即可
13.head指令
head 与 tail 就像它的名字一样的浅显易懂，它是用来显示开头或结尾某个数量的文字区块，head 用来显示档案的 开头至标准输出中，而
tail 想当然尔就是看档案的结尾。
语法： head [参数]… [文件]…
功能：
head 用来显示档案的开头至标准输出中，默认head命令打印其相应文件的开头10行。
选项：
-n<行数> 显示的行数
14.tail指令
tail 命令从指定点开始将文件写到标准输出.使用tail命令的-f选项可以方便的查阅正在改变的日志文件,tail - ffilename会把filename里最尾部的内容显示在屏幕上,并且不但刷新,使你看到最新的文件内容.
语法： tail[必要参数][选择参数][文件]
功能： 用于显示指定文件末尾内容，不指定文件时，作为输入信息进行处理。常用查看日志文件。
选项：
-f 循环读取
-n<行数> 显示行数
举例：（简单讲解重定向和管道）
有一个文件共有100行内容，请取出第50行内容<br>
seq 1 100 > test # 生成1到100的序列装入test
方法1 head -n50 test > tmp #将前50行装入临时文件tmp
tail -n1 tmp #得到中建行
方法2 head -n50 test | tail -n1
【取前三和后三】
[root@VM-4-9-centos KongQing]# less test.txt
[root@VM-4-9-centos KongQing]# head -3 test.txt
hello 106 [0]
hello 106 [1]
hello 106 [2]
[root@VM-4-9-centos KongQing]# tail -3 test.txt
hello 106 [998]
hello 106 [999]
hello 106 [1000]
【输出中间三个】
1.临时文件的方案：
[root@VM-4-9-centos KongQing]# head -101 test.txt > tem.txt
[root@VM-4-9-centos KongQing]# tail -3 tem.txt
hello 106 [98]
hello 106 [99]
hello 106 [100]
【>】重定向符将内容写入后面的文本文件中
2.管道：
[root@VM-4-9-centos KongQing]# head -101 test.txt | tail -3
hello 106 [98]
hello 106 [99]
hello 106 [100]
并逆置，提前前三行
最后
十分感谢你可以耐着性子把它读完和我可以坚持写到这里，送几句话，对你，也对我：
1.有时候你可以自私，你不必坚强，你可以哭泣，你可以做任何别人无法理解的事情来发泄你的烦恼(别犯法)，当你休息好，要记得再出发。
2.很多成就，大的成就小的成就，都是在痛苦，挫折，困难中收获的。只做简单的事情，你没法成长也很正常。
3.注意健康，好好活着。来人间一趟不容易。
4.当你害怕时不要退缩，我劝你迎难而上，如果你是个小朋友，在学校被人揍了，一定要当场给我揍回去，但是反击适当，不要太重。哪怕打不过，下一次他揍你之前也会好好想想。如果你不反击，他连想都不会想。
5.如果有一天，让你心动的再也感动不了你，让你愤怒的再也激怒不了你，让你悲伤的再也不能让你流泪，你便知道这时光、这生活给了你什么，你为了成长，付出了什么。
最后如果觉得我写的还不错，请不要忘记点赞✌，收藏✌，加关注✌哦(｡･ω･｡)
愿我们一起加油，奔向更美好的未来，愿我们从懵懵懂懂的一枚菜鸟逐渐成为大佬。加油，为自己点赞！
