awk nr

command-line arguments argv command-line parameter arrangement environ support the use of system environment variables in queues filename awk browses the file name Fnr the number of records to browse files FS Set input field delimiter, equivalent to command line-F option NF Browse record number of fields nr

all lines that have the root keyword/etc/passwd and display the corresponding shell'/root/{print $7}'/etc/passwd /bin/bash Action{print $7} is specified here.awk built-in variablesAwk has many built-in variables for setting up environment information, which can be changed, and some of the most commonly used variables are given below.ARGC command-line arguments argv command-line parameter arrangement environ support the use of system environmen

operator ==,>,# awk-f ': ' $1== "nobody" ' 1.txtNobody:x:99:99:nobody:/:/sbin/nologin# awk-f ': ' $1== ' nobody ' | | $1~/nolog/' 1.txt# awk-f ': ' $4>=500 ' 1.txt# awk-f ': ' $7!= "/sbin/nologin" ' 1.txtThe# awk-f ': ' $7~/nolog/' 1.txt#

RS control record delimiter is a new line (\ n)The following example shows the built-in variables of awk.NR allows you to quickly view the number of records. For example, you need to view the number of records after exporting database files.# Awk 'end {print NR} 'grade.txt5# Awk '{print NR}' grade.txt12345#

specified here.awk built-in variablesAwk has many built-in variables for setting up environment information, which can be changed, and some of the most commonly used variables are given below.ARGC number of command line argumentsARGV Command line parameter arrangementENVIRON support for the use of system environment variables in queuesFileName awk browses the file nameFNR number of records to browse filesFS sets the input domain delimiter, which is e

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

of the contents of each row). Search support for the regular, for example, root start: awk-f: '/^root/'/etc/passwd#awk-F: '/root/'/etc/passwdroot:x:0:0:root:/root:/bin/bash5. Search for all lines that have the root keyword/etc/passwd and display the corresponding shell. Action{print $7} is specified here.# awk-f: '/root/{print $7} '/etc/passwd /bin/b

/' 1.txt for a segmentmultiple matches awk-f ': '/root/{print $1,$3}; $ ~/test/; $ ~/20/' 1.txtconditional operator = =, >,awk-f ': ' $3== ' 0 "' 1.txt;awk-f ': ' $3>= ' 1.txt;awk-f ': ' $7!= '/sbin/nologin ' 1.txt;awk-f ': ' $3awk-f ': ' $3> ' 5 " $3awk-f ': ' $3> ' 5 "| |

(1) awk principleThe principle of awk is to process the data in a file line by row, find content that matches what is given on the command line, and then program the next step if a match is found. If no match is found, continue with the next line.(2) Awk combatSed-n '/jd.com/p ' jfedu.txt awk '/jd.com/' jfedu.txtCommen

: '/root/{print $7} '/etc/passwd/bin/bashAction{print $7} is specified here.awk built-in variablesAwk has many built-in variables for setting up environment information, which can be changed, and some of the most commonly used variables are given below.ARGC number of command line argumentsARGV Command line parameter arrangementENVIRON support for the use of system environment variables in queuesFileName awk browses the file nameFNR number of records t

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 browsesFNR#number of records to browse filesFs#set input field delimiter, equivalent to command line-F optionNf#number of fields to browse for recordsNr#the number of records that have been readOFS#output Field delimiterORS#Output Record delimiterRs#Control record delimiterIn addition, the $ variable refers to the entire record. $ $ represents the first field of the current row, which is the second field of the current row,...... And so onStatist

of spaceawk ' {printf ' the name is%-15s ID is%8d\n ", $1,$3} ' employeesThe name is Tom ID is 4424The name is Mary ID is 5346The name is Sally ID is 1654The name is Billy ID is 16833. Records and Domains in awk:The default record delimiter in awk is carriage return, which is stored in the built-in variables ors and Rs. The-$ variable refers to the entire record.#这等同于print的默认行为. awk ' {print $} ' employees

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 |

24 beijing 50003 weijianjun 29 shanghai 80004 wanmingyang 28 beijing 50005 tianzhiyu 25 beijing 55006 zhouhaoxing 23 beijing 50002.1 shows the full line of xiao, such as $2, or $2, which is equal to liu.[Root @ store_2 awk] # awk '{if ($2 = "xiao") | ($2 = "liu") print $0} 'fawk. a1 xiao 25 beijing 90002.3 display the rows of xiao or $2 including liu, such as $2[Root @ store_2

/bash Action{print $7} is specified here.awk built-in variablesAwk has many built-in variables for setting up environment information, which can be changed, and some of the most commonly used variables are given below.ARGC command-line arguments argv command-line parameter arrangement environ support the use of system environment variables in queues filename awk browses the file name Fnr the

delimiterNumber of domains in the current NF recordNo. Of NR records so farOFS output domain separatorORS output record separator1. awk '/101/'file: The file contains 101 matching rows.Awk '/101/,/105/' fileAwk '$1 = 5' fileAwk '$1 = "CT"' file must contain double quotation marksAwk '$1 * $2> 100' fileAwk '$2> 5 $2 2.

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#

per IP is sorted from small to large: awk ' {++s[$1]} END {for (a in S) print S[a],a} ' log_file | Sort-n See which pages are accessed by an IP (for example, 202.106.19.100): grep ^202.106.19.100 Access.log | awk ' {print $1,$7} ' Statistics August 31, 2012 14 o'clock how much IP access is in: