Awk 中的默认 IFS 是制表符和空格。 Awk: 遇到输入行时，根据定义的IFS，第一组字符为field one，访...
calc_sum.awk { for (i = 1; i<=NF; i++) { sum += $i } print "line", NR, "sum:", sum sum = 0 } The program calculates the sum of values for each line. for (i = 1; i<=NF; i++) { sum += $i } This is a classic for loop. We go through each of the fields ...
Example of defining variables, multiple commands on one lineNR == 1 {prev=$4; preva = $1; prevb = $2; n=0; sum=0} $4 != prev {print preva, prevb, prev, sum/n; n=0; sum=0; prev = $4; preva = $1; prevb = $2} $4 == prev {n++; sum=sum+$5/$6} END {...
All that allows you to write compact programs to perform calculations on data columns: awk '{ SUM=SUM+$1 } END { print SUM }' FS=, OFS=, file 263 Or, equivalently using the += shorthand syntax: awk '{ SUM+=$1 } END { print SUM }' FS=, OFS=, file 263 Please note AWK ...
Converting Rows into Columns using awk or sed, Slurp the file into hold space (HS) deleting the pattern space (PS) until the end-of-file condition is met. At end-of-file swap the HS for the PS. Copy the PS to the HS and then remove all but the first field following a newline ...
sum = 0 i = 1 while (i < 5) { sum += $i i++ } average = sum / 3 print "Average:",average }' testfile The while loop runs and every time it adds 1 to the sum variable until the i variable becomes 4. You can exit the loop using break command like this: ...
sum2 } sum3 # sum3 - print sums of numeric columns sum3 # input: rows of integers and strings sum3 # output: sums of numeric columns sum3 # assumes every line has same layout sum3 sum3 NR==1 { nfld = NF sum3 for (i = 1; i <= NF; i++) ...
But if the value of the first column contains multiple words then only the first word of the first column prints. By using a specific delimiter, the first column can be printed properly. Create a text file named students.txt with the following content. Here, the first column contains the ...
Multiple file input BEGINFILE, ENDFILE and FILENAME nextfile ARGC and ARGV Summary Exercises Processing multiple records Processing consecutive records Context matching Records bounded by distinct markers Specific blocks Broken blocks Summary Exercises Two file processing Comparing records Comparing fields ...
catsales.csv|awk-F","'{sum += $2} END {print sum}' 这里-F","指定,为分隔符,$2表示第二列。 3.5 使用sed进行文本替换 sed可以用来替换文本,例如: catfile.txt|sed's/old/new/g' 将file.txt中所有old替换为new。 关于sed的解析请看后文。