Awk built-in variables and custom variables
In awk, variables are divided into two types: built-in variables and user-defined variables....
Awk classic case – awk analysis of nginx access logs
Awk classic case - awk analysis of nginx access logs.Count top visits and the number of visits in the most recent time....
awk replace statement and examples
Awk replace statement can help us format the input data conveniently. Use of awk string manipulation functions: gsub() ...
awk tutorial: awk multiple conditions
Awk supports if else conditions judgment, and multiple conditions operations with && (and) or || (or) can be used....
How to use awk concatenate string in linux/unix
Awk concatenated strings, you can use awk OFS variables, or you can use strings directly. syntax: awk'BEING {s1="string1";s2="string2";OFS="delimiter";print s1,s2;}'...
How to use awk to select substring in linux/unix
Awk substr has built-in functions that can help us select substrings anywhere in the input string. awk substr syntax: substr(string, start, lenght)...
awk ternary condition judgment and examples
Awk ternary condition judgment is similar to the awk if else statement, providing branch control capability. Ternary syntax: ( Statement ) ? True :...
awk OFS field separator with examples
Awk OFS field separator variable, output field separator. It is a pair with the Awk FS variable; awk FS separates strings as fields, and awk...
awk FS field separate with examples
awk separate string, you can use awk FS variable or awk -F option to support single delimiter and multiple delimiter regular matching....
awk array operations with examples
Awk array, it supports associative array, the index is a number or a string. awk array syntax: array_name[index]=value...
How to remove lines with specific line number from text file with awk or sed in Linux/unix
Remove specific line numbers in linux/unix, use awk NR variable to delete a specific line numbers, use sed command action option "d" to delete a...
How to remove the first line of a text file using the linux command line?
remove the first line: use awk NR variable, awk '{if(NR>1){print $0}}' file ; use sed action option d, sed '1d' file; use tail n...
How to delete empty lines in a text file in linux/unix
To delete blank lines in a text file, you can use awk NF variable, awk regular expression, sed regular expression and grep -v '^$'...
How to delete lines containing a specific string in a text file in linux/unix
Delete lines containing a specific string in a text file, we have three implementation methods: sed -i '/ pattern/d', grep -v 'pattern' and awk '!/pattern/...
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...