Awk usage: awk 'pattern' {action }'

Awk usage: awk 'pattern' {action} 'variable name meaning ARGC command line variable number ARGV command line variable element array FILENAME current input file name FNR current file record number FS input domain separator, default is a space RS input record delimiter NF number of fields in the current record NR number of records so far OFS output domain separator ORS output record separator 1 awk '/101/'file display file contains 101 matching rows. Awk '/101 /, /105/'file awk' $1 = 5 'file awk' $1 = "CT" 'file note that the double quotation marks awk '$1 * $2> 100' file awk '$2> 5 & $2 <= 15' file 2, awk '{print NR, NF, $1, $ NF,} 'file displays the current record number, number of fields, and the first and last fields of each row of the file. Awk '/101/{print $1, $2 + 10}' file displays the first and second fields of the matching row of the file plus 10. Awk '/101/{print $1 $2}' file awk '/101/{print $1 $2}' file displays the first and second fields of the matching row of the file, however, there is no Separator in the time domain. 3. df | awk '$4> 1000000' is input through a pipeline operator. For example, a row with 4th fields meeting the conditions is displayed. 4. awk-F "|" '{print $1}' file is operated according to the new separator "|. Awk 'in in {FS = "[: \ t |]"} {print $1, $2, $3} 'file by setting the input separator (FS = "[: \ t |] ") modify the input separator. Sep = "|" awk-F $ Sep '{print $1}' file uses the environment variable Sep value as the separator. Awk-F' [: \ t |] ''{print $1} 'file uses the value of the regular expression as the separator. Here, space,:, TAB, and | are used as the separator at the same time. Awk-F' [] [] ''{print $1} 'file uses the value of the regular expression as the separator, here, [,] 5 and awk-f awkfile are controlled sequentially through the content of the awkfile file. Cat awkfile/101/{print "\ 047 Hello! \ 047 "} -- print 'Hello! '. \ 047 represents single quotes. {Print $1, $2} -- because there is no mode control, print the first two fields of each row. 6. awk '$1 ~ /101/{print $1} 'file: the first field in the file matches 101 rows (records ). 7. awk 'in in {OFS = "%"} {print $1, $2} 'file modifies the output format by setting the output separator (OFS = "%. 8. awk 'in in {max = 100; print "max =" max} BEGIN indicates the operation performed before any row is processed. {Max = ($1> max? $1: max); print $1, "Now max is" max} 'file gets the maximum value of the first domain of the file. (Expression 1? Expression 2: expression 3 is equivalent to: if (expression 1) expression 2 else expression 3 awk '{print ($1> 4? "High" $1: "low" $1 )} 'File 9, awk' $1 * $2> 100 {print $1} 'file shows that the first field in the file matches 101 rows (records ). 10. awk '{$1 = 'chi' {$3 = 'China '; print} 'file: Find the matching row, replace the first 3rd fields, and then display the row (record ). Awk '{$ 7% = 3; print $7}' file divides the 7th domain by 3, assigns the remainder to the 7th domain, and then prints it. 11. awk '/tom/{wage = $2 + $3; printf wage}' file: Find the matching row, assign a value to the variable wage, and print the variable. 12. awk '/tom/{count ++;} END {print "tom was found" count "times"}' file END indicates processing after all input rows are processed. 13. awk 'gsub (/\ $/, ""); gsub (/,/, ""); cost + = $4; END {print "The total is $" cost> "filename"} 'file gsub function replaces $ and with an empty string, and then outputs The result to filename. 1 2 3 $1,200.00 1 2 3 $2,300.00 1 2 3 $4,000.00 awk '{gsub (// $/, ""); gsub (/,/,""); if ($4> 1000 & $4 <2000) c1 + = $4; else if ($4> 2000 & $4 <3000) c2 + = $4; else if ($4> 3000 & $4 <4000) c3 + = $4; else c4 + = $4;} END {printf "c1 = [% d]; c2 = [% d]; c3 = [% d]; c4 = [% d] \ n ", c1, c2, c3, c4} "'file uses the if and else if condition statements awk '{gsub (/\ $/," "); gsub (/,/,""); if ($4> 3000 & $4 <4000) exit; else c4 + = $4;} END {printf "c1 = [% d]; c2 = [% d]; c3 = [% d]; c4 = [% D] \ n ", c1, c2, c3, c4}" 'file exits with exit when a condition is specified, but the END operation is still executed. Awk '{gsub (/\ $/, ""); gsub (/,/, ""); if ($4> 3000) next; else c4 + = $4;} END {printf "c4 = [% d] \ n", c4} "'file uses next to skip this row when a condition is specified, perform operations on the next row. 14. awk '{print FILENAME, $0}' file1 file2 file3> fileall writes all the content of file1, file2, and file3 to fileall, in the format of a print file and prefix the file name. 15. awk '$1! = Previous {close (previous); previous = $1} {print substr ($0, index ($0, "") + 1)> $1} 'fileall splits the merged file into three files. And is consistent with the original file. 16. awk 'in in {"date" | getline d; print d} 'sends the execution result of date to getline through the pipeline, assigns it to the variable d, and then prints it. 17. awk 'in in {system ("echo \" Input your name: \ c \ ""); getline d; print "\ nYour name is", d, "\ B! \ N "} 'enter the name through the getline command and display it. Awk 'in in {FS = ":"; while (getline <"/etc/passwd"> 0) {if ($1 ~ "050 [0-9] _") print $1} 'print the username in the/etc/passwd file that contains the 050x _ username. 18. awk '{I = 1; while (I <NF) {print NF, $ I; I ++}' file loops through the while statement. Awk '{for (I = 1; I <NF; I ++) {print NF, $ I}' file loops through the for statement. Type file | awk-F "/" '{for (I = 1; I <NF; I ++) {if (I = NF-1) {printf "% s ", $ I} else {printf "% s/", $ I }}' shows the full path of a file. Use for and if to display the date awk 'in in {for (j = 1; j <= 12; j ++) {flag = 0; printf "\ n % d month \ n", j; for (I = 1; I <= 31; I ++) {if (j = 2 & I> 28) flag = 1; if (j = 4 | j = 6 | j = 9 | j = 11) & I> 30) flag = 1; if (flag = 0) {printf "% 02d % 02d", j, I }}}'19. To call system variables in awk, you must use single quotation marks, the string Flag = abcd awk '{print' $ Flag '}' is returned as abcd awk '{print "$ Flag"}' and above $ Flag