AWK Cheatsheet

learn.awk

file.txt is something like this. ls with size of files
"""
asd 12213
asd 1231231
sdas 4534
sdas 4534
sdas 4534
sdas 4534
sdas 4534
"""

awk '{print $0}' file.txt -> Prints whole lines of file
awk '{print $1}' file.txt -> Prints 1st element of  each line of file
awk '{print $2}' file.txt -> Prints 2nd element of each line of file
awk '{print $1,$2}' file.txt -> Prints 1st and 2nd element of each  lines of file
awk '/gcc/ {print $1}' file.txt -> Prints 1st  element of each lines of file which contains regex /gcc/
awk '{print $1,$2/1024"K"}' file.txt -> Prints 1st element of each line and divide 2nd element of each line to 1024 and add K char
awk '/gcc/ && $2 > 15 {print $1}' file.txt -> Prints if 1st element of each lines of file which
    contains regex /gcc/ and the 2nd element of each line is greater than 15

echo "/gcc/ && $2 > 15 {print $1}" >> script.awk
awk -f script.awk file.txt  


awk '{print $1,int($2/1024)"K"}' file.txt -> cast the 2nd line to integer

Use functions in awk scripts
"""
    func round(n){
        n = n + 0.5
        n = int(n)
        return n
    }
    /gcc/ && $2 > 15 {print $1,round($2/1024)"K"}
"""



func printlist(n){
    for(i=1;i<=n;i++){
        printf("%d",i)
    }
    printf("\n")
}

{ printlist($1) } // call the function for each line of 1st element
"""