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Http://www.chinaunix.net/old_jh/24/691456.htmlhttp://wenku.baidu.com/view/ebac4fc658f5f61fb736664d.html awk usage: awk 'pattern {action }' Variable name meaning Number of argc command line Variables Argv command line meta Array Filename current input file name Number of records in the current FNR File The input field delimiter of FS. The default Delimiter is a space. RS input record delimiter Number of dom
[Copyright statement: reprinted. Please retain the Source: blog.csdn.net/gentleliu. Mail: shallnew at 163 dot com] Awk has many built-in variables used to set environment information. These variables can be changed. The following are the built-in variables of awk: Number of argc command line parameters Argv command line parameter arrangement Environ supports the use of system environment variables in the q
[[Email protected]awk]#seq Ten|Xargs-N2>file[[Email protected]awk]#seq Ten-1 1|Xargs-N2>File1[[email protected]awk]#Cat file1 23 45 67 89 Ten[[Email protected]awk]#Catfile1Ten 98 76 54 32 1[[Email protected]awk]#Cat file|awk '{pri
Actual Application of awk: Text Merge Use the awk command to combine the two lines with the same names in the following two files[Root @ localhost ~] # Cat 1.txtHan Hailin, 21 years oldHai linhan, 23 years oldHan Linhai, 22 years oldLin haihan, 24 years old[Root @ localhost ~] # Cat 2.txtHan Linhai maleHai Lin Han NanHan Hailin maleLin haihan Nan Output result:Han Hailin, 21, male[Root @ localhost ~] #
end.Domains and recordsDomain ID: $1, $2 ,..., $ N. Use commas to separate fields. $0 indicates all domains.Print domain or all domain: Print commandNote: When an awk error occurs, you can find it:1. Make sure that the entire awk command is enclosed in single quotes2. Make sure all quotation marks in the command are enclosed in pairs.3. Make sure that the Action Statement is enclosed in curly brackets and
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 number of records to browse files FS Set input field delimiter, equivalent to command line-F option NF Browse r
is space. Regular Expressions are supported. For example, the [] character group is used as the separator below. NF: number of fields currently processed. $0 indicates the entire record. $1 indicates the first field and $ NF indicates the last field. [[emailprotected]awk]#catboracle:x:500:500::/home/oracle:/bin/bash[[emailprotected]awk]#awk‘BEGIN{FS="[:/]"}{for(i=1;i
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 variables in queues filename
,AnandRam,Developer105,JaneMiller,SalesManager Print command: The position parameter $1 $2... $ n represents the 1st columns and 2nd columns of a record, respectively. column N #awk-F,‘{print$1,$2}‘employee.txt101JohnnyDoe102JasonSmith103RajReddy104AnandRam105JaneMiller Built-in variables of awk: FS: input field separator OFS: output field separator RS: Input record separator input record Separator ORS: O
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
that have the root keyword/etc/passwd and display the corresponding shellawk ' /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 command-line arguments argv command-line parameter arrangement environ support the use of system environment var
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 number of records to browse files FS Set input field delimiter, equivalent to command line-F option NF Browse record number of fields
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
/passwdSearch all lines that have the root keyword/etc/passwd and display the corresponding shellawk ' /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 command-line arguments argv command-line parameter arrangement environ support the use 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
/passwd and display the corresponding shell# awk-f: '/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 command-line arguments argv command-line parameter arrangement environ support the use of syste
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
} 'fawk. a1 xiao 25 beijing 90002.3 display the rows of xiao or $2 including liu, such as $2[Root @ store_2 awk] # awk '{if ($2 = "xiao") | ($2 ~ /Liu/) print $0} 'fawk.1 xiao 25 beijing 90002 liuwenjing 24 beijing 50002.3 calculate how many rows of NR are displayed[Root @ store_2 awk] #
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
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 number of records to browse files FS Set input field delimiter, equivalent to command line-F option NF Browse record number of fi
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