它允许您创建简短的程序,这些程序读取输入文件、为数据排序、处理数据、对输入执行计算以及生成报表,还有无数其他的功能。 awk是一个强大的文本分析工具,与grep(查找)、sed(编辑)一并称为“文本处理三剑客”。awk最强大的功能是对数据分析并生成报告。 awk有3个不同版本: awk、nawk和gawk,未作特别说明,一般指gawk...
The conversion format for numbers, "%.6g", by default. ENVIRON An array containing the values of the current environment. The array is indexed by the environment variables, each element being the value of that variable (e.g., ENVIRON["HOME"] might be /home/arnold). Changing this array ...
[root@centos7~]#awk 'BEGIN{score=60;if(score<60){print "no pass"}else if(score<=80){print "so so"}else{print "good"}}' 两种赋值变量方式都可以 [root@centos7~]#awk -v score=60 'BEGIN{if(score<60){print "no pass"}else if(score<=80){print "so so"}else{print "good"}}' ...
GNU awk( gawk) [toc] ## gawk:模式扫描和处理语言 ``` 1. 基本用法: awk [options] 'program' var=value file… awk [options] -f programfile var=value file… awk [options] 'BEGIN{action;… }pattern{action;… }END{action;… }' file ... awk 程序可由:BEGIN语句块、能够使用模式匹配的...
An array containing the values of the current environment. The array is indexed by the environment variables, each element being the value of that variable (e.g., ENVIRON["HOME"] might be "/home/arnold"). In POSIX mode, changing this array does not affect the environment seen by program...
(var in array) {for-body} [root@c7-147 ~]#awk 'BEGIN{total=0;for(i=1;i<=100;i++){total+=i};print total}' 5050 [root@c7-147 ~]#awk '/^[[:space:]]*linux16/{for(i=1;i<=NF;i++) {print $i,length($i)}}' /etc/grub2.cfg linux16 7 /vmlinuz-3.10.0-327.el7.x86...
delete array[index] delete array exit 2.awk控制语句if-else 使用场景:对awk取得的整行或某个字段做条件判断 语法: if(condition){statement;…}[else statement] if(condition1){statement1}else if(condition2){statement2}else{statement3} [root@centos7 ~]# awk -F : '{if($3>1000)print $1,$3...
关联数组:array[index-expression] index-expression: (1) 可使用任意字符串;字符串要使用双引号括起来 (2) 如果某数组元素事先不存在,在引用时,awk 会自动创建此元素,并将其值初始化为“空串” 注:若要判断数组中是否存在某元素,要使用“index in array”格式进行遍历 ...
then the array subscript is a string consisting of the concatenation of the (string) value of each expression, separated by the value of the SUBSEP variable. This facility is used to simulate multiply dimensioned arrays. For example: i = "A"; j = "B"; k = "C" x[i, j, k] = "...
Awk treats integers as strings when used as array indexes. Then it concatenates them if you pass multiple values, either separated by space, comma or not separated at all. There is no space between these concatenated values. Another thing to note is that the 'for..in' loop doesn't ...