sudo tee

Tags: Shell special symbol cut, sort, WC, uniq, tee, TR, split command* Represents 0 or more arbitrary characters[[email protected] ~]# ls *txt11.txt 1.txt 22.txt 2.txt aa.txt a.txt？ Represents only one arbitrary characterWhether it's a number or a letter, as long as it matches a single character.[email protected] ~]# ls?. Txt1.txt 2.txt a.txt B.txt[[email protected] ~]# ls? txtls: unreachable? txt: no file or directoryComment Symbol #, after which th

Linux tee command-specific application of the tee command: tee Function Description: Read standard input data and output its content into a file. Syntax: tee [-ai] [-- help] [-- version] [file…] Note: The tee command reads data from the standard input device, outputs the dat

In Linux, the system that improves performance calls sendfile. Splice and tee may be familiar with Linux kernel version 2.4: a static Web Page Server named khttpd is embedded in the kernel of version 2.4. At that time, it may be because of the efficiency factor that she was added. As to why the latest version 2.6 kernel removed this server, I think it may be because the Linux kernel "only provides a mechanism, and does not provide a policy ", of cours

1. under the root directory/core: This directory file is only used to build tee core/lib: This directory file is used to build tee core and trusted applications/ta: This directory file is only used to build trusted applications/MK: Build the system's compiled file (Makefile)/tmp-stuff: Temporarily stored and will be deleted before final compilation is complete/scripts: Help scripts for multiple tasks/out: I

Cut to segment a fileCut-d: (Specifies the delimiter)-f (paragraph) 3,4,5/etc/passwdCUT-C (intercept the first few characters) 1-10/etc/passwdSort used for sortingSORT-T: (Specifies the delimiter)-K3 (paragraph)-N (Pure numeric sort)/etc/passwdSORT-T: (Specify delimiter)-k3,5 (interval segment with, number, not used-)-N (Pure numeric sort)-R (reverse order)-U (de-duplication)/etc/passwdWc-l (number of lines in a document) 1.txt 2.txtWc-w (How many word words) 1.txtWc-m (number of characters, inc

Shell Basics (iv) Uniq and TeeUniq is used to repeat the row, the most common option is only one, that is,-C count counts the number of repeated rows, and writes the number of repetitions in front.Note: Use the premise that you need to sort the files first, otherwise it won't work.#vim aming.txt "Write"111222111333#uniq aming.txt "Separate use of uniq, do not remove duplicate lines that are not together."111222111333#sort aming.txt |uniq "After using sort, use Uniq"111222333#sort Aming.txt |uniq

-I ignores caseBut then there will be no output generated, because when the two files are the same as the default behavior, if you want to see the prompt say the same thing:-S option reports the same two filesUse -B to ignore spacesCompare two files differently and produce patchesIn addition to files, thediff command can compare two directoriesVimdiffThere is only one row in a file, the color is relativeTwo files exist, but contain differences in the behavior of one color, causing the difference

removes the wtmp row, you can understand the number of rows to be calculated. Bidirectional redirection: Tee [Root @ Linux ~] # Tee [-A] FileParameters:-A: add data to the file in the append mode!Example:[Root @ Linux ~] # Last | tee last. List | cut-d ""-F1# This example allows us to save the last output to the last. list file;[Root @ Linux ~] # Ls-L/home |

Linux I/O redirection and pipelines (about tr and tee commands) When I first started to get in touch with IO redirection, I had gone through the process of understanding, understanding, and then rolling. Of course, now I cannot fully understand IO redirection, I am not confused about IO redirection when solving some problems or implementing some results. What is IO redirection? To solve this problem, we need to first understand what is IO and what is

To think of something simple, we know that > will transfer the data stream to a file or device, so we cannot continue to use this stream unless we go to read the file or device. What should I do if I want to save a piece of information in the process of processing this data stream? With tee We can look at this in a simple way:Tee will distribute the data stream to the file and screen at the same time, and the output to the screen is actually stdout, a

1.uniq filtering repetition (can only handle duplicates immediately adjacent to two rows, not adjacent, not processed)Uniq- C 1.txt filtering repeats, counting several repetitions and non-repetition. -C for statistical countingSort 1.txt |uniq-c is sorted first, in filter repetition, statistics count.Sort 1.txt |uniq = = Sort-u 1.txt (same effect)2.tee Dual Output redirectionecho "1234" > 1.txt = = echo "1234" |te