awk 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

field in each row has a variable name, which is the variable name of $ $. In the example above, root is $ $, because he is the first column! 192.168.211.1 is the third column, so it's $ $, and so on. And the variables, that is, he represents the meaning of a whole row of data. In the above example, the first line of "$" represents the "root" thatline. It follows that the whole process of awk is in the above five elements:1, read into the first line,

number[Email protected] ~]#[Email protected] ~]# awk-f: ' nr[Email protected] ~]# awk-f: '/nologin$/{print $ ' test.txt #打印以nologin结尾行的第一个字段[[email protected] ~]# awk-f: ' $1~/^r.*t$/{print nr,$3} ' test.txt print the first field starts with R and ends with T[[email protect

. Run in Script Mode and specify the input file later. Note that awk statements are different in awk scripts and shell scripts. The former uses the syntax rules of the awk program, and the latter only writes the first two usages to the file for execution, follow the syntax rules of shell scripts. 3. When reading a file, you can specify other Record Separator in a

/passwdors:output ROW serperator Output Rows Separator#awk ' begin{ors= ': '}{print $1,$7} '/etc/passwdNf:number of FIELD Number of fields# awk ' begin{fs= ': "}{print NF $1,$7} '/etc/passwdNr:number of RECORD number of rows, all files counted together# awk ' begin{fs= ': "; ofs=": "}{print nr,$1,$7} '/etc/passwdFNR: m

awk: Report GeneratorDisplay information after formattingGrammar:awk [Options] ' script ' file1 file2, ...awk [Options] ' Parttern {action} ' file1 file2, ...The most common action:print,printfBasic features of awk:A. Every time you take a lineB. The line is cut by the specified delimiter (not specified as a bit whitespace character), using $1,$2,$3 (whole row), ... (first column, second column,... ）C. You

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 environment variable

/passwdSearch 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 syst

). Therefore, each line of input data represents a record, the content in each row is left blank and separated into multiple fields. With fields and records, awk can process files flexibly.Syntax 1 syntax A typical awk syntax is as follows: Awk '{BEGIN {stat1} BEGIN {stat2}Pattern1 {action1} pattern2 {action2}... patternn {actionn} {default action, unconditional,

condition - To illustrate: [Email protected] ~]# vim 6.txt11 22 33 4455 66 77 88 [[email protected] ~]# awk ' {print $} ' 6.txt1155 [[email protected] ~]# awk ' {print $ '---' $6.txt '---33---77 [Email protected] ~]# sed-i ' s//:/g ' 6.txt #空格加:[email protected] ~]# cat 6.txt11:22:33:44:55:66:77:88: [[email protected] ~]# awk-f

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 equivalent to the command line-F optionNF browsing the number of field

without separating the format from the format;printf does not automatically print line breaks;the indicator for FORMAT begins with% , followed by a character, with:%c(the ASCII code that displays the characters ),%d and %i(decimal integer),%e and %E(scientific notation displays values),%f(floating point),%g and %g(scientific notation or floating-point format display values),%s(string), %u(unsigned integer),percent(show % itself)modifiers are:-(for left-aligned),+(displays numeric symbols),NUM(i

的数量Argind #命令行中当前文件的位置 (starting with 0 marking)Argv #命令行参数的数组Convfmt #数字转换格式ENVIRON #环境变量关联数组Errno #最后一个系统错误的描述Filedwidths #字段宽度列表, separated by a space keyFILENAME #当前文件名FNR #浏览文件的记录数Fs #字段分隔符, the default is the space keyIgonrecase #布尔变量, if true, ignores case matchingNf #当前记录中的域数量Nr #当前记录数Ofmt #数字的输出格式OFS #输出域分隔符, the default is the space keyORS #输出记录分隔符, the default is line breakRlength #由match函数所匹配的字符串长度Rs #记录分隔符, the default is the space keyRst

/bin/bash Action{print $} was specified here awk Built-in variables Awk has a number of built-in variables to set up environment information, which can be changed, and some of the most commonly used variables are given below. ARGC the number of command-line arguments ARGV command line arguments ENVIRON the use of system environment variables in the suppo

Argv 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 input record delimiterNumber of domains in the current NF recordNo. of NR records so farOFS output domain SeparatorORS output record Separator 1. awk '/101/'file: The file contains 101 matching rows.Awk '/101/,/105/' fileAwk '$1 = 5' FileA

Variable name meaningNumber of argc command line VariablesArgv command line meta ArrayFilename current input file nameFNR record number in the current fileThe input field delimiter of FS. The default Delimiter is a space.RS input record delimiterNumber of domains in the current NF recordNo. of NR records so farOFS output domain SeparatorORS output record Separator 1. awk '/101/'file: The file contains 101

Awk is broad and profound, and I have not been deeply studied in the work except for simple usage.Another, attach several blog articles, follow up may update this list: Linux awk Command Detailed http://blog.chinaunix.net/uid-25120309-id-3801250.html Http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858470.html "AWK" Removes the space:awk ' {

complete awk script is typically used to format the information in a text file. Typically, awk is treated as a unit of a file's behavior. awk processes the text by executing the corresponding command for each line that receives the file.awk built-in variablesARGC command-line arguments argv command-line parameter arrangement environ

1. What is the difference between sed and awk?(1) Awk: Operations by column (domain); sed: line by row(2) awk: Text processing language, suitable for extracting text; SED: non-interactive editor for editing text2. Which parameter does awk use as a split parameter when it is working on a domain?-F3. Please print out the

#1, print the usage of the mounted directory, the default is separated by a spacedf-ph | awk ' {print $5,$6} '#2, separated by a space, colon, \ t, semicolonAwk-f ' [: \ t;] ' ' {print '} '#3, Print lines 3rd through 5th in the 6.txt file, nr represents the print line, and $ A is the text all fieldsawk ' nr==3,nr==5 {p