Tag: linux awk

AWK tutorial: awk group by count

When we are dealing with log files, we often need to count the number of times some keywords appear. For example, count the number of...

awk merge files base on the keyword

use the awk variables NR and FNR merge files base on the keywords. awk -F' ' 'NR==FNR{a[$1]=$2;}NR!=FNR{print $0, a[$1]}' test-4.txt test-5.txt...

awk custom function and examples

Here, you need to use the awk custom function to implement the abs function. awk 'function abs(x){return (x < 0) ? -x : x;} {print...

awk loop example: awk for and while

awk for loop: awk -F"#" '{for(i=1;i<=NF;i++) { ... }' t.txt; awk for loop array: awk 'BEGIN{a["km"] = "m";a["kn"] = "n";for(i in a) {...}}'; awk while loop: awk -F"#"...

AWK tutorial: three ways of awk execution

Linux awk command execution ways: 1. Command line execution Detailed introduction of syntax, see 《Linux awk》 2. Shell script file execution Explanation: !/usr/bin/awk The first...

awk NR FNR difference

Linux awk command can use variables NR and FNR to process multiple files. NR : ordinal number of the current record, multiple files self-increase FNR...

AWK tutorial: awk sort uniq

In daily development, we often use awk command to cut and sort log file columns and count them. awk sort uniq count example awk column...

awk system batch operation

1. use awk command batch creation of files awk 'BEGIN {do {++i; system("touch file_num_" i "_test") } while (i<9) }' .........