awk 工具可以很灵活地对文本进行处理,这里的 awk '{print $2}'是指第二列的内容,是运行的程序 ID。 ps -ef | grep py | grep QR | grep -v AND | awk '{print $2}' | xargs kill -9 ps -ef | grep -v grep | grep App | awk '{print $2}' | xargs kill -9...
$ awk '/raspberry/ { print $0 }' colours.txt raspberry red 99 如果没有文本符合模式,该动作将会应用到所有记录上。 并且,在一条规则只包含模式时,相当于对整个记录执行{ print },全部打印出来。 Awk 程序本质上是数据驱动的,命令执行结果取决于数据。所以,与其他编程语言中的程序相比,它还是有些区别的。
To print specific fields from a file usingAwk, you can use the “print” statement along with the desired field variables. For instance, to print the first, second, and third fields of a file separated by a comma, we can use the following command: awk '{print $1 "," $2 "," $3}...
-F,fields,设置字段(一列)分隔符;(联想到cut -d) -v,var=value定义awk程序中的一个变量及其默认值(变量在代码里可以用,在外面定义在里面用) 常见用法 awk [options] '{script}' file 中间有一个代码部分{script},作用和sed命令很像 代码部分'{script}' 的结构: 基础结构: '{script}' 匹配结构:' ...
Hello; I have a file consists of 4 columns separated by tab. The problem is the third fields. Some of the them are very long but can be split by the vertical bar "|". Also some of them do no | The UNIX and Linux Forums
{ print nf } #input line的所有累加总的fields8、/Beth/ { nlines = nlines + 1 } END { print nlines } #含有Beth这个单词的总行数9、$1 > max { max = $1; maxline = $0 } END {print max, maxline } #输出第一列最大的行10、NF > 0 #field输出非空的行11、length($0) > 80 #...
-f #:(--fields=LIST)指定显示分割后的那一部分数据,取第几位的字符(#代表数字) 输出的情况 1)输出一段:指定一个编号 2 2)输出连续多段:编号-编号 2-5 3)输出不连续多段:编号,编号... 2,3,5 示例: (1)bin:10:15:i am bin:/home/bin:/sbin/nologin ...
{ print $2, $1 } Example 3 Same, with input fields separated by comma and/or blanks and tabs: BEGIN { FS = ",[ \t]*|[ \t]+" } { print $2, $1 } Example 4 Add up first column, print sum and average: { s += $1 } END { print "sum is", s, " average is", s/...
for (i = 1; i <= NF; i++) { print $i;}```4. 对于具有不同字段数量的记录,NF可以帮助我们对它们进行条件判断和处理。例如,我们可以使用if语句根据字段数量来执行不同的操作。下面是一个示例:```if (NF == 3) { print "This is a record with 3 fields";} else if (NF == 4) { print...
How can I tell to awk if I want to print from field number 2 to the end of the line (beside, each line has different number of field)? So, if the line 1 has 4 fields, then I want to print field 2, 3 and 4. If the second line has 6 fields, I want to print field 2, ...