sed command in unix

A About SEDUnlike a full-screen editor such as VI, SED is a non-interactive text editor that edits text files and standard input, which can come from keyboards, file redirects, strings, variables, and even text from pipelines. SED is the line-by-line processing of lines in text. Sed simply edits a copy of the original file in the buffer and does not edit the sour

Command usage: Displays the contents of 20 to 30 lines of the file-------------------------------------------------SeqGenerating sequencesSEQ >[file name] Generates a sequence of 1~100 rows:123...100Note:The sequence starts at 1 only when the maximum value is defined aboveSEQ 0 100 starts from 0, sequence order follows natural number orderSeq-1 100 starting from-1:-1 0 1 ... 100-------------------------------------------------SedStream Editor Stream e

SedSED is a powerful text-processing toolYou can use regular matching, insert and delete text, and so on.When SED is processed, one row at a time, each time the current processing is stored in a temporary buffer, the output buffer content to the screen after processing, and then read the next line into the buffer, so repeat, until the end.1. command format and Parameterssed [-NEFR] [action] FileParameters:-

Demand:Add the BUILD.SBT file,the line to the line, and the beginning of the comment #650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M00/9E/61/wKiom1mP5TrScvadAADjZLqiabA210.png-wh_500x0-wm_ 3-wmp_4-s_1256233124.png "style=" Float:none; "title=" 001.png "alt=" Wkiom1mp5trscvadaadjzlqiaba210.png-wh_50 "/>The command is as follows:#sed-i "45,77s/^/#/g" BUILD.SBT650) this.width=650; "Src=" https://s5.

Sed:stream Editor, line editors:Usage: sed [option] ... ' Script ' Inputfile ...This shows the contents of the/etc/fstab, which will be used laterCommon options: -N: Do not output the contents of the mode to the screen -e: Multi-point editing -f:/path/to/script_file: Reading the edit script from the specified file -R: Supports the use of extended regular expressions -I: In situ editing Address delimitation (Edit

According to the makefile of GNU make, a sed command is used in automatic dependency tracing. Sed's,/($ */)/. O [:] *,/1.o $ @:, G' By the way, let's take a look at the SED editor. %. D: %. c@ Set-E; RM-F $ @;/$ (CC)-M $ (cppflags) $ Sed's,/($ */)/. O [:] *,/1.o $ @:, G' Rm-F $ @. $ Find the header file that the. c file depends on by using the GCC compil

first to third path.#echo $PATH | Cut-d ': '-f 1-3/bin:/usr/bin:/sbin:Take the path variable out, I want to find the first to third, there is a fifth path.echo $PATH | Cut-d ': '-f 1-3,5/bin:/usr/bin:/sbin:/usr/local/binPractical Example: Display only/etc/passwd users and shells#cat/etc/passwd | Cut-d ': '-f 1,7 root:/bin/bashdaemon:/bin/shbin:/bin/shWCThe number of words in the statistics file, how many lines, how many characters.WC syntax[[email protected] ~]# WC [-LWM] options and Parameters

Unix/Linux sync command, unixlinuxsync command Write cache command -- sync After the unix system is started with the reboot command, the system prompts an error message, and some applications cannot work normally. After carefully

sed Line Editor:sed is a row editor that processes a single line of content at a time. When processing, the currently processed row is stored in the temporary storage area, called the "pattern Space", and then the SED command to process the contents of the buffer, after processing, the contents of the buffer to the screen. Proceed to the next line, so repeat and

two times, because the sed command also displays the contents of the pattern space by default, and the p command displays the matching rows, so there are two lines650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/70/30/wKiom1WzVfuQgAnWAABbZ2c3mJY525.jpg "title=" Picture 4.png "alt=" wkiom1wzvfuqganwaabbz2c3mjy525.jpg "/>-N Displays only the rows that ma

Linux system maintenance process, often through automatic script to deal with operations, and as the most commonly used language is the shell to complete the script. When it comes to substitution we often use SED to do the replacement work.Here is a brief summary of the functions of SED to facilitate the application of subsequent scriptsThe most basic format of SED