awk nr

Tags: att spl control statement ini Tin Shel Match strong while1. Principleawk, a line-of-text processing tool that processes data in a file on a row-by-line basisSyntax: awk ' pattern + {action} 'Description(1) The single quotation mark "is to separate from the shell command area;(2) curly braces {} denote a grouping of commands;(3) pattern is a filter that indicates that the line hitting pattern is handled by action;(4) Action is the processing acti

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

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

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

To learn more about getline in awk getline, you must first understand the concepts of $0, NR, and FNR. The so-called NR can be understood as NumberofRecord, or a row number, while FNR can be understood as NumberofRecordinFile, or become a row number in the file. it sounds no different... getline of awk To learn more ab

first line) NR [root]/root/test $ ps-ef | grep uwsgi | awk '$2 = "20596" | NR = 1 {print $7}' 00: 00: 0100: 00: 19 Built-in variables:$0-> current record (this variable stores the content of the entire row)$1 ~ $ N-> the nth field of the current record. The fields are separated by FS.FS-> the default delimiter for input fields is space or Tab.NF-> the number of

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

the log records from the Tomcat log catalina.out for 2014-10-13, 07:00-15:00 time period, and save.awk ' begin{rs= ' 2014-10-13 "}$1>" 07:00:00 "$1NR: Prints the line number of the input that is currently being processedawk ' {print nr ') "$"-"$ (NF-2)} ' awk.txt Where: Print NR: Represents the line number" of the input currently being processed ": Indicates that the line number is encl

system environment variables in queuesFileName awk browses the file nameFNR number of records to browse filesFS set input field delimiter, equivalent to command line parameter-F optionNF browsing record number of fieldsNR number of records readOFS output Field delimiterORS Output Record delimiterRS Control record delimiterExample:Awk-f ' # ' {print nf,nr,$0} ' Grade.txtAwk-f ' # ' {print nf,

Split usage Echo "hello_xiao_lan" | awk '{split ($0, B, "_"); print B [3]}' // Substr usageAwk '{A = substr ($1, 2); print a}' file2 // Calculate the mean value Awk '{sum = $1 + sum; count ++} end {print count, sum, sum/count}' aa.txt Awk '{max = ($2> Max? $2: Max)} end {print max} 'test.txt Group to maximize Awk-F

-in variables for setting up environment information, which can be changed, and some of the most commonly used variables are given below.650) this.width=650; "alt=" Copy Code "src="/img/fz.gif "/>argc the number of command-line arguments argv command line parameter arrangement environ support the use of system environment variables in queues filename awk Browse by file name fnr number of records to browse files fs set input field delimiter, equiva

/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 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

/{ print $2 }'|awk -F: 'BEGIN { print "begin..."}'{ print $2 } END { print "end..." }'In addition, awk can also process compound expressions: Finally, awk is not only a command, but also a programming language.Variable:1. The internal variable awk '{print NR, $0}' # adds a

1. function is to print all input linesawk ' {print $} ' F Ilename2. Print the input file line eighthawk ' Nr==8{print $} ' F Ilename3. Use awk to print the first field of all rows of a fileAwk-f: ' {print $} ' F Ilename4. Print the total number of input linesawk ' begin{num=0;} {num++;} End{print num} ' f ilenameawk ' End{print NR} ' F Ilename5. Print the number

UNIX System error messages FieldWidths Enter a blank delimited string of field widths FNR Current number of records Ofmt Output format for numbers%.6g Rstart String first matched by matching function Rlength Length of string matched by matching function Subsep 34 2. Example 1. Common operation The code is as follows: [Chengmo@localhost ~]$ awk