grep sed awk

Problem: Filtering out the Stat/etc/hosts permission valueAct 1:[[email protected] ~]# stat/etc/hosts|sed-n ' 4p ' | awk-f ' [0/] ' {print $} '644Note:[0/] in awk meansAccess: (0644/-rw-r--r--)Act 2:[[email protected] ~]# stat/etc/hosts|awk-f ' [0/] 'nr==4 {print $} '644Act 3:[Email protected] ~]# stat/etc/hosts|

Sed and awk overlap, but we can understand that SED performs operations on text content (Text replacement) and awk performs operations on text structure. 1. Replace zhc in the filename file with hongchangfirst and put it in filename2. Sed's/zhc/hongchangfirst 'FILENAME> filename2 2. Put the

Sed Awk Example 2 per dayThe p command can be used to output the current pattern space ). 1. Output $ sed 'P' employee.txt 101, John Doe, CEO101, John Doe, CEO102, CEO102, Jason Smith, IT Manager102, Jason Smith, IT Manager103, AJ Reddy, Sysadmin103, AJ Reddy, Sysadmin104, Anand Ram, comment 104, Anand Ram, comment 105, Jane Miller, Sales Manager105, Jane Miller

For shell, sed, grep, and regular expressions in LINUX, you must learn about the common Linux technology-Linux programming and kernel information. For more information, see the following. For example, for a person working in LINUX, shell, sed, grep, python, and other things are hard to learn. In addition, they are regu

A small chestnut that uses sed and awk to process text, sedawk text Chestnut I have encountered a problem in my homework for the Linux operating system course over the past two days. I feel very interesting and have a great test of awk proficiency. I have shared this with you. First, the question is as follows: RECORD # This is the redundant comment line one # r

I recently started to learn shell + sed + awk. Linuxsir. orgSee the following comments ArticleTo make it easy for more people to see it! Shell + sed + awk The three features are the weakest and not debugged. ProgramMost operations can be performed only by running other programs. Therefore, more time, memory, and lo

Reprinted from Jrckkyy final edit Zengzhaonong Using shell variables in sed and awk----------------------------------------------x=mmSed ' s/ab/' $x '/g ' B.COrSed ' s/ab/' "$x" '/g ' B.CSed ' s/' "$val" '//' UrfileThe most recent process of anticipation, using bash scripts, requires the use of shell variables in the script's sed and

OneSed:stream Editor, stream editors;awk (gawk): Text formatting tool, Report BuilderTwo SED stream editor for filtering and transforming textsed [OPTION] ... {Script-only-if-no-other-script} [Input-file] ...Working mechanism: Each time a line of text is read into "pattern space", the processing is done in the mode space, and the processing result is output to the standard output device;Command parameters-R

Linux Command Learning 1 (awk, grep), awkgrep 1. Write AWK internal code (for better understanding) BEGIN{size=0}{ if($5>4096){ size=size+$5; printf("%-10i%s\n",$5,$9)}}END{print "size is",size/1024/1024} 2. Remove the carriage return and add other parts. ls -l|awk 'BEGIN{size=0}{if($5>4096){size=size+$5;print

Took an e-mail address, want to go to the address of the heavy.Open the file a look, several columns. There are comma distinctions and there are spaces to distinguish 9589,860122@qq.com,1,1,2015-04-08 15:31:07.763000000, Xianyang, Shaanxi Province, qq.com,59590,4605708@qq.com,1,1,2015-04-08 15:31:07.763000000, Shenzhen, Guangdong Province, qq.com,59591,3307150@qq.com,1,1,2015-04-08 15:31:07.763000000, Hangzhou city, Zhejiang Province, qq.com,59592,1378747@qq.com,1,1,2015-04-08 15:31:07.76300000

ObjectiveUse Nginx website may encounter abnormal access traffic, be friendship detection, program appeared bug and other sudden situation, then everyone's reaction must be the first time to analyze the log, and then found that the log has more than dozens of GB, but also need to follow the time, error type or key fields to retrieve information will be a kind of clairvoyant, The illusion of a tight chrysanthemum. The method described in this article, whether it is goaccess or

fourth line to AAAAAAAAsed-i '/^selinux/c selinux ' changes all rows starting with SELinux to SELinuxsed-i ' 4d ' to remove line fourthsed-i '/^tom/d ' file delete all lines starting with Tomsed-i '/^$/d ' file to delete empty linessed-i '/^\s$/d ' file delete starts with a blank line \s represents a space or tabsed-i '/^abc/s/tom/jerry/' file first finds the line that starts with ABC change Tom to Jerrysed-i '/^mike/s/^/# ' file notes the Mike linesed-n ' 1p; 3p ' file prints first and third l

sed -i s/"str1"/"str2"/g 'grep "str1"-rl--include="*.[ CH]" ./'Replaces the STR1 string in all. C,. h files in the current directory with the STR2 string.parameter explanation:Sed:-I represents the operation of the file, the ' ' enclosed grep command, which represents the result of the grep command as the action files/

When usingTail-f Test.log | grep "mode" | awk ' {print $} ' commandor tail-f Test.log | When awk '/mode/{print $} ', if there is little data in the test.log that satisfies pattern mode, it will be found that even the new rows in the Test.log that are satisfied with modes do not have any output from the above two commands.The reason is that

same time, First, the simple way to solve my needs.The launcher is simple, and as a service, it needs to run in the background, assuming your executable name is called program.So you need to start:Nohup program [args] To close it requires:#PROGRAM是进程名PID = ' pidof program ' if [!-Z ' $PID ']; Then kill-15 $PID fiHowever, for Java or Python programs, the process is Java or Python, there is no degree of differentiation, so you can not use the "pidof" command, you can only use "ps-ef" comm

-wmp_4-s_4195172997.png "title=" Qq20170401111735.png "alt=" Wkiom1jfg-odmdk4aaaficfz25u286.png-wh_50 "/>Cat Data.txt | Grep-v ' ^$ ' | Sed ' s/^/id/g '---the line of non-whitespace lines in each row of the outfit add id,^ symbol to start with650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M00/8F/74/wKioL1jfHCuwRhB_AAAcgQvF0vQ789.png "title=" Qq20170401111827.png "width=" 720 "height=" "border=" 0 "

The program becomes a zombie process and requires a process number to force termination, so you need to get the PID of the process first PS | grep Test | awk ' nr==1{print $ {} ' Gets the ID of the test process, in accordance with the format of the Linux output, my device is the first line of the first column of the first parameter is the PID of testIt is not possible to pass PID to KILL-9 through a pipe. S