How to print tree directory structure in linux/unix
Print tree directory structure in linux. Print the tree directory structure using the tree command;
Print multilevel tree directory structure using the find and awk combined...
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 tutorial: 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 tutorial: awk custom function and awk example
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 tutorial: find and kill process use awk
Step 1. View the process ID pid of the top command.
Step 2. Use the awk command to get the process ID.
Step 3. Use...
Awk tutorial: awk -F and awk BEGIN{ FS … }
Usually, when I use awk for text processing, I prefer to use the awk -F option for text field separation. Of course, we can also...
Awk tutorial: awk regex example
What Is Regex?
Types of Regex:BRE and ERE. Awk using BRE regex Patterns, Special Characters; Awk using ERE regex Patterns, matches the start...
Linux shell batch move files, delete spaces, rename files
1. Use linux find, move files in batch;
2. Use linux find, delete empty directories in batch;
3. Use shell while loop, batch delete spaces in file...
Awk tutorial: 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...