awk nr

current file. Fs The field delimiter (the default is any space). IGNORECASE If true, the matching of the case is ignored. Nf The number of fields in the current record. Nr The current number of records. Ofmt The output format of the number (the default value is%.6g). OFS The Output field delimiter (the default value is a space).

1} Condition Type 2 {Action 2 }.... End {post-processing }'The statements in begin and end play a role before and after reading the file (in_file). They can be understood as initialization and scanning.(1) parameter description:-F re: Allows awk to change its field separator-V Var = $ V: Assign the value of V to var. If multiple variables need to be assigned a value, write multiple-v values. Each variable corresponds to one-V value.E.g. Print the row

Is this a book 4. Awk common built-in variable tables: 1 $0 current record (as a single variable) 2 $1 ~ $ N the nth field of the current record. The fields are separated by FS. 3. The default delimiter of the FS input field is space. 4. The number of fields in the current NF record is the number of columns. 5 The number of records that NR has read, that is, the row number, starting from 1 6. The record i

Awk usage: awk 'pattern' {action} 'variable name meaning ARGC command line variable number ARGV command line variable element array FILENAME current input file name FNR current file record number FS input domain separator, default is a space RS input record delimiter NF number of fields in the current record NR number of records so far OFS output domain separator

separator when entering Awk 'in in {FS = ":"} {print $1, $7} '/etc/passwd => of course, this writing method is really inferior to awk-F: '{print $1, $7}'/etc/passwd RS: Record seperator, output line Separator OFS: output field seperator, which is the field separator for output; [[Email protected] _ 6 data] # awk 'in in {FS = ":"; OFS = "*"} {print $1, $7} '/etc/

timesX{m,}:x at least repeat m timesX{,m}:x up to repeat m timesX{m,n}:x repeats at least m times, but not more than n times[[emailprotected] tmp]# cat awk1rootrrttgood[[emailprotected] tmp]# awk --posix ‘/o{2}/{print $0}‘ awk1rootgood[[emailprotected] tmp]#2、关系表达式: Operation with operator, can be a string or numeric comparison test , [[emailprotected] tmp]# awk ‘NRgt;=2{print $0}‘ awk1rrttgo

Multi-dimensional awk array and multi-dimensional awk Although the awk command does not claim to support multi-dimensional arrays, it provides a method to define multi-dimensional arrays. Awk defines multi-dimensional arrays by concatenating multiple subscripts into strings. subscripts are separated by the value of the

# Boolean variable. If it is true, case-insensitive matching is performed. NF # number of domains in the current record NR # Number of current records OFMT # digital output format OFS # output domain separator, default is Space key ORS # output record delimiter, which is a line break by default RLENGTH # String Length matched by the match Function RS # record separator. The default value is Space key. RSTART # The 1st position of the string matched b

Multi-file handling for awk:AWK's data input has two sources, standard inputs and files, and the latter way supports multiple files, such as1. Shell's pathname expansion way: awk ' {...} ' *.txt # *.txt is interpreted by the shell first, replaced by all *.txt in the current directory, such as 1.txt and 2.txt in the current directory, then the command ends with awk ' {...} ' 1.txt 2.txt2. Specify multiple fi

-workstation.sh-rwxr-xr-x 1 root root 3.0K Feb 22 2012 lang.csh-rwxr-xr-x 1 root root 3.4K Feb 22 2012 lang.sh-rwxr-xr-x 1 root root 122 Feb 23 2012 less.csh-rwxr-xr-x 1 root root 108 Feb 23 2012 less.sh-rwxr-xr-x 1 root root 97 Mar 6 2011 vim.csh-rwxr-xr-x 1 root root 293 Mar 6 2011 vim.sh-rwxr-xr-x 1 root root 170 Jan 7 2007 which-2.sh Try awk ls -lh | awk '{print $1}' Here, there is no BE

SeparatorORS output record SeparatorRS control record delimiter In addition, the 0 variable refers to the entire record. The value 0 indicates the entire record. 1 indicates the first domain of the current row, $2 indicates the second domain of the current row, and so on. Statistics/etc/passwd: file name, row number of each row, column number of each row, corresponding to the complete row content: # Awk-F': ''{print" filename: "FILENAME", linenumber:

= $v assigns a V value to Var, and if there are multiple variables to be assigned, write multiple-V, and each variable assignment corresponds to a-Ve.g. to print the line between the NUM line of file A and the Num+num1 line,Awk-v num= $num-v num1= $num 1 ' nr==num,nr==num+num1{print} ' a-F Progfile: Allows awk to invok

======Basic article======1. An action instance without patternA awk ' {print NR $ $NF} ' data.txt prints line numbers, first and last columns, no separators in middleb awk ' {print $, $NF} ' data.txt prints the first and last columns, with delimiters in the middleC awk ' {print$0, $NF +10} ' data.txt prints the entire

each row is output by default ). Regular Expressions are supported in search, for example, awk-F: '/^ root/'/etc/passwd. Search for all rows with the root keyword in/etc/passwd and display the corresponding shell # Awk-F: '/root/{print $7}'/etc/passwd /Bin/bash Action {print $7} is specified here} Awk built-in VariablesAwk has many built-in variables used to set

. built-in variables of awk Common variables of awk include:NF: How many segments are separated by delimitersNR: number of rows{Print NR ":" NF} lists the row numbers separated by colons to list the total number of segments; [Root @ bkjia ~] # Head-5 passwd | awk-F: '{print NR