awk nr

in a) print a[i],i| " Sort-k1-nr|head-n10 "} ' Access.logMethod 2:$ awk ' {print $} ' access.log |sort |uniq-c |sort-k1-nr |head-n10Description: a[$1]++ creates an array A, takes the first column as the subscript, uses the operator + + as the array element, and the element initial value is 0. When processing an IP, the subscript is IP, the element plus 1, proces

] 'begin{ initialization} Condition Type 1 {Action 1} Condition Type 2 {Action 2 }.... END {post-processing }'The statements in BEGIN and END play a role before and after reading the file (in_file). They can be understood as initialization and scanning.(1) parameter description:-F re: Allows awk to change its field separator-V var = $ v: Assign the value of v to var. If multiple variables need to be assigned a value, write multiple-v values. Each vari

Awk BASICS (Marco video), awk basics Marco Awk Basics1.1 print Print format: Print item1, item2 ,.... Key points: Example: # Awk 'in in {print "line one \ nline two \ nline three "}' Awk-F: '{print $1, $2}'/etc/passwd Built-in variables: ORS (output record sepatator) (output

, $3. In particular, awk uses $0 to represent the entire row (record ). Different fields are separated by characters called delimiters. The default Delimiter is space. Awk allows the use of-F in command lineTo change the separator. In fact, awk uses a built-in variable FS to remember this separator. Awk has several suc

command line-f optionNF browsing the number of fields recordedThe number of records that NR has readOFS Output Field SeparatorORS Output Record SeparatorRS Control Record Separator In addition, the $ variable refers to the entire record. Represents the first field in the current row, and $ $ represents the second field of the current row,...... Analogy Statistics/etc/passwd: File name, line number for each line, number of columns per row, correspon

, and a part of a row is used as a field in the record. In order to operate these different fields, awk uses the shell method to represent different fields in the row (record) in sequence in the form of 1, 2, 3. In particular, awk uses 0 to represent the entire row (record ). Different fields are separated by characters called delimiters. The default Delimiter is space.

Variables Awk has many built-in variables used to set environment information. These variables can be changed. The following lists the most common variables. Number of ARGC command line parameters ARGV command line parameter arrangement ENVIRON supports the use of system environment variables in the queue FILENAME awk browsed file name Number of FNR browsing file records FS sets the input domain separator

Ulimit-n corresponding/etc/security/limits.conf file settingsProblem: Can ' t open so many files for Linux OPS students, I believe they have encountered this problem.Under Linux All resources are files, ordinary files are files, disk printers are files, sockets of course also files. The system is set to 1024 by default, but this number is not enough for servers, especially large concurrency, so we need to change the actual situation to a larger and more reasonable value.Modify methodTemporary so

elementsbinmode: Number (0) convfmt: string ("%. 6g ") errno: Number (0) fieldwidths: string (" ") filename: string ("-") FNR: Number (1) FS: string (" ") ignorecase: number (0) Lint: Number (0) NF: Number (0) Nr: Number (1) ofmt: string ("%. 6g ") ofs: string (" ") ors: string (" \ n ") rlength: Number (0) RS: string (" \ n ") rstart: number (0) RT: string ("") subsep: string ("\ 034") textdomain: string ("messages") I: Number (11) S: Number (362880

Error Nr is reported at the last step of mysql installation. 1045 solve the problem that the first time mysql database was installed on my computer, it always cracked the crude Nr. 1045 1. go to control panel-> Administrative Tools-> services, open MySQL Services 2. enter the command window, and then enter the MySQL installation directory, for example, enter the c: \ Program Files \ MySQL Server 5.1 \ bin c

Source Address: http://yanshuaijun.2010.blog.163.com/blog/static/362411622011102443056225/ topic: MySQL Error nr.1045 workaround2011-11-24 16:30:56| Category: mysql| report | Font Size Subscribe1. Go to cmd manually stop MySQL service: net stop MySQL. 2. Modify the My.ini file under the 5.1\ directory of the C:\Program files\mysql\mysql Server and add it under [mysqld]Skip-grant-tables 3. Start the MySQL service in cmd: net start MySQL 4. Open MyS

" {while ("Ls-1rt" | getline) {print NR ":" $ > "List.txt";}} 'Guess: What is the content of List.txt after the script is finished running?Answer:Cat List.txt 1 : Demo.txt 1 : List.txtI believe a lot of friends will feel surprised:Some people think that List.txt should have only one row of data, which is the last line of the LS-1RT command output.Some people think there should be 6 data, because LS-1RT executes three times.People who have this idea,