sed and awk pdf

Commands that should be run by Linux administrators: sed and awk Image Source: Shutterstock Do not let the next-generation Linux and Unix administrators forget the benefits of initializing scripts and basic tools. I once saw a post in Reddit, "How do I operate text files ". This is a simple requirement, just as we often encounter Unix people every day. The problem is how to delete duplicate rows in a file

Content directory: Find file lookup grep text Search xargs command line parameter conversion sort sort Uniq eliminate duplicate rows with TR convert cut by column split text paste by column stitching text WC statistic lines and characters tool sed text substitution benefits The lines, words, and characters in the iteration file for the AWK Data flow processing tool This article describes the most commonly u

the -DD 6 - - $ $ About[[Email protected]~]#awk '{print $}'result.txt The first column of the display content AabbccDDDisplay the first column of/etc/passwd with: as a delimiterawk ' {print $} ' /etc/passwdrootbindaemonadmLPsyncshutdownhaltmailoperator Show first and third column contents [[emailprotected] ~]# awk " Span style= "COLOR: #800000" >{print $1,$3} " result.txt AA 17 BB 18 cc 19

/fstab3. Save the odd line of the/etc/fstab file as a/tmp/fstab.3;Solution:sed ' 1~2w/tmp/fstab.3 '/etc/fstab4.echo a file path to the SED command, take out its base name, and further, remove its path name;Answer:1.echo/etc/fstab | Sed-r ' [Email protected]*/([^/]+)/[email Protected]\[email protected] ' base name2.echo/etc/fstab/| Sed-r ' [email protected] ([^/]+

/grub.conf file;# sed ' [email protected]^[[:space:]]\{1,\}@@ '/boot/grub/grub.conf6, take out a file path directory name, such as/etc/sysconfig/network, its directory is/etc/sysconfig, functions similar to dirname command;# echo/etc/sysconfig/network-scripts/ifcfg-eth0/| Sed ' [Email protected][^/]\{1,\}/\[email protected]@ 'awk command:Usage format:

grep (keyword: intercept) text-gathering tool, combined with regular expression is very powerfulMain parameters []-C: Output only matching rows-I: Case insensitive-H: Do not display file names when querying multiple files-L: Only file names with matching characters are output when querying multiple files-N: Displays matching line numbers and rows-V: Displays all lines that do not contain matching text (I often use the remove grep itself)Basic how to work: grep to match the content file name, for

Introduction to Sed and AWK is a programming language dedicated for text processing. yes, it is a programming language. it only serves text processing, so you cannot use it to write system software or Scientific Computing (of course, it can also do mathematical computing ), it can only be used for text processing. unlike sed,

Three major text processing tools: grep, sed, awk, and grepawk1. Use grep to search for text in a file Grep can accept regular expressions to generate output in various formats. In addition, it has a lot of interesting options.1. Search for text lines that contain a specific mode: 2. Read from stdin: 3. A single grep command can search multiple files: 4. The -- color option highlights the matched words in t

If you have other scripting languages, please also list the reply content if you have other scripting languages: Sed-when you need to do simple text transforms on files. Awk-when you only need simple formatting and summarization or transformation of data. Perl-for almost any task, but especially when the task needs complex regular expressions. Python-for the same tasks that you cocould use Perl. Here

'/test/{print $ test-----If the record contains a regular expression test, the first field is added 10 and printed out. $ awk ' {print ($ > 5? "OK" $: "Error" ($)} ' test-----If the first field is greater than 5, the expression value after the question mark is printed, otherwise the expression value after the colon is printed. $ awk '/^root/,/^mysql/' test---- Prints all records in the rang

; D.txtThe regular in SED:1: Delete file empty line[[Email protected] ~]$ sed '/^$/d '/etc/passwd >e.txt2: Write a record (line) containing EXT4 in Fstab to a new file[[Email protected] ~]$ sed '/ext4/w newfstab '/etc/fstab======================================================================AwkAWK is a programming language tool for working with textAny

script file name to be filtered. -E followed by a matching expression -N: the default output is not displayed. Sed script command: Sed '/root/A/text'/etc/passwd adds a new line of text after the row of the root object. Sed '/root/C/text'/etc/passwd should be replaced with text in the root line of the file Sed '/root/I

If there are other scripting languages, please also list Reply content: Sed-when you need to does simple text transforms on files. Awk-when need simple formatting and summarization or transformation of data. Perl-for almost any task, but especially when the task needs complex regular expressions. Python-for the same tasks that's could use of Perl for. Here's a full answer: / http stackove

Sed amp; Awk one case per day 1. sed [options] {sed-commands} {input-file} sed-n amp; #39; p amp; #39; /etc/passwd2, sed [options]-f {sed-commands-in-a-file} {input-file} $ vi

I. Regular Expression Introduction Basic metacharacters (basic regular expressions): character matching :. match any character except the line break [] character group metacharacters. If the metacharacters are within [], it will lose special meaning and do not need to escape [^] Except for the number of characters in the character group. match: * match the first character Zero or multiple times \? Zero or one \ {M, N \} At least m times, up to n \ {M, \} m times of Anchor: \ Tested,

the domain name statistics return code is greater than or equal to 400 percent, if Youku total 4 lines, a return code greater than or equal to 400 has two lines, that is 50% awk ' { count[$1]++; if ($2>400) above400[$1]++ } end{ for (i in count) { print I, Count[i], above400[i]/count[i] } } ' Example two:Count the percentage of all the error in a fileawk '/error/{err++}end{print err,nr,err/nr*100

Basic shell programming [3]-common tools awk \ sed \ sort \ uniq \ od, awkuniqAwk Awk is a very useful thing. It is widely used in the presentation and processing of linux system analysis results. You can also use pipelines, input | awk ''| output1. first, you need to know the form of

Basic use of sed and awkIn sed and awk, each directive consists of two parts: patterns and procedures. A pattern is a regular expression separated by a slash (/). The process formulates one or more actions that will be performed.During execution, the first instruction in the script is read and the pattern of the current line is detected, and if there is no match,

Grep, awk, sed instance File datafile: www.2cto. com01SteveBlenheim: 238-923-7366: 95 LathamLane, Easton, PA83755: 11/12/56: 2030002 BettyBoop: 245-836-8357: 635 CutesyLane, Hollywood, CA, grep, awk, sed instance File datafile: www.2cto.com 01 Steve Blenheim: 238-923-7366: 95 Latham Lane, Easton, PA 83755: 11/12/56: 20

'/[:::]1[1-2][:/:]/p ' datafile6. Add three asterisks (* * *) to the line starting with Fredsed-e ' s/^fred/***fred/' datafile7. Replace the row containing Jose with Jose has retiredsed-e ' s/^jose.*/jose has retire/g ' datafile8. Change Popeye's Birthday to 11/14/46Cat datafile | grep Popeye | sed-e ' s/3\/19\/35/11\/14\/46/'9. Delete all blank linessed-e '/^$/d ' datafile10. Write a script that will:. Insert the title personnel FILE before the firs