tutorial awk

Common awk commands (for conversion) and awk commands Awk usage: awk 'pattern' {action }'Variable name meaningNumber of ARGC command line VariablesARGV command line meta ArrayFILENAME current input file nameNumber of records in the current FNR FileThe input field delimiter of FS. The default Delimiter is a space.RS inp

All users who are familiar with linux know that linuxshell is very powerful in text processing. all users who are familiar with linux know that linux shell is very powerful in text processing. There is a powerful set of text processing tools: grep, sed, awk. Grep is often used for searching and matching texts, sed is used for text editing and replacement, and awk is also the most powerful. it is often used

Previous We all know that Linux Shell is very powerful in text processing. There is a powerful set of text processing tools: grep, sed, awk. Grep is often used for searching and matching text and SEDCompositionThis edited replacement and awk are also the most powerful and often used for report generation! The processing efficiency is very high. A file of several hundred MB can also be completed in seconds!

Awk built-in Function Analysis and awk built-in functionsI. mathematical functions The following arithmetic functions perform the same operations as child routines with the same name in C: Function Name Description Atan2 (y, x) Returns the arc tangent of y/x. Cos (x) Returns the cosine of x. x is a radian. Sin (x) Returns the sine of x, which is a radian.

Linux Shell programming awk and linuxshell programming awk Awk [-field-separator] 'commands' input-file (s) Basic Mode Awk-F ':'... Use # to separate Awk '{print $0}' a.txt Print all Awk '{print $1, $3}' a.txt Print 1s

Linux shell sed awk command (2)-awkawk syntax Format:awk [Options]-F program-file [--] file ...Options:-F FS,--field-separator FSCreate a delimiter with FS as the input line (the default delimiter is a space or tab)-V Var=val,--assign var=valBefore executing the procedure, set a var value of Val-F program-file,--file Program-fileRead the awk instruction from the script file to replace the input processing s

Invoking awk in a shell script is very natural and simple, so let's look at awk calling the shell and passing the variable to the Shell,awk using the variables in the shell, awk passing the value to the shell variable Invoking awk in a shell script is very natural and sim

One, what is awk awk is a command under Linux, his output of other commands, the processing of the file is very powerful, in fact, he is more like a programming language, he can customize variables, conditional statements, there are loops, there are arrays, there are regular, there are functions, and so on. He reads the output, or file The way is a row, read a line, according to the conditions you give to

Awk (1), awkThe following information is extracted from the netstat command as an example. $ cat netstat.txtProto Recv-Q Send-Q Local-Address Foreign-Address Statetcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTENtcp 0 0 0.0.0.0:80 0.0.0.0:* LISTENtcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTENtcp 0 0 coolshell.cn:80

11 shell command awk, 11shell command awk Awk, as an amazing command, can help us solve seemingly complex and difficult problems in minutes. Awk, as its name implies (I am so embarrassed ). is a tool for processing text lines. just kidding, this command cannot be the name suggests. it is said to be the first letter of

AWK resolution, awk resolutionCut command limitations Df-h | cut-d ""-f 5/etc/passwd The cut command cannot correctly intercept the content with spaces as the separator. AWK format Awk 'condition 1 {Action 1} condition 2 {Action 2 }... 'Filename' Condition (Pattern) [relational expressions are generally used as cond

Awk string truncation, awk string1) how to split the current string with $0, for example:Cat num.2012032911 | awk '{print $2}' | awk '{split ($0, B, "."); print B [2]}' | cut-c 3-Obtain the second column. For example, if the second column is com. sb3456.you, you can obtain sb3456 from the current split string, and the

Awk and awk commands Awk usage: Move file: ls-lrt | awk '{if (substr ($20111029, 8) = '000000' substr ($, 26, 3) = 'unl ') print "mv" $8 "/home/etl/data/interface;"} '| ksh Sum: awk '{sum + = $1} END {print sum }' Delete a file: ls-lrt |

Printf- Align LeftWidth Field step, 0 for 0 step. Prec The maximum string length, or the number of digits to the right of the decimal%c ASCII characters%d integral type%e Scientific Counting method%f floating point type%g awk determines which floating-point number is converted to E or F%o octal%s string%x HexExample one:i161 Admin # df-th|awk ' {print $1,$5} 'Filesystem AvailRootfs 23G/dev/root 23GTmpfs 16G

Awk notes, awk learning notesAwk: Awk names: The abbreviations of the three people: Aho, (Peter) weberger and (Brain) Kernighan; In-row fields can be processed during row processing. This is not allowed by grep/sed. In special cases, $0 is used to indicate the row; Usage: awk [-F re] [parameter...] ['prog'] [-f pro

The problem of passing parameters in awk has always been a headache for many people. The following is a summary: I. Direct call of awk scripts . For example, the following script requires the calculation of the total number of logs on the 15th to 30th. $3 indicates the domain that distinguishes the encoding of different pages. The script is as follows: #/Bin/sh;Page = $1;I = 15;While test $ I-le 30Do#

Awk command usage, awk Awk Programming Language/Data Processing Engine Creator: Aho weinberger kernighan Check input based on pattern matching (read row-by-row output) Print the expected matching result to the screen Syntax format: Awk 'mode {operation}' file 1 file 2 ..... Common built-in Variables The ordinal numbe

Awk array statistics, awk Array Process the following file content, retrieve the domain name andDomain Name countSorting: (Baidu and sohu interview questions) 1 http://www.etiantian.org/index.html2 http://www.etiantian.org/1.html3 http://post.etiantian.org/index.html4 http://mp3.etiantian.org/index.html5 http://www.etiantian.org/3.html6 http://post.etiantian.org/2.html Results: mp3.etiantian.org 1post.etian

-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language:#0400;mso-bidi-language:#0400;}--> 1. Introduction Retrieve various types of data from the original data file, remove the header, and output it to different files named according to the data type. This sorting and formatting task is a basic part of data analysis and processing. You can use awk, grep/SED/

A regular expression: a regular expression (or regular expression, called re) is a text pattern consisting of ordinary characters (such as characters A through Z) and special characters (called metacharacters). This pattern describes one or more strings to match when looking up a text body. A regular expression, as a template, matches a character pattern to the string you are searching for. Simply put, the regular expression is the method of processing the string, it is the behavior unit to cond