awk 'f{print $3; f=0} /Energy/{f=1}' inputfile > outputfile 1、使用awk在列包含字符串时提取行 2、SQL:如何根据第三列的值过滤包含某个产品的所有行 3、是否使用awk仅包含以特定值开头的列? 4、awk打印到文件正在附加而不是覆盖 5、删除任何列包含特定字符串的行 1、Shell三剑客之awk2、Grid 行...
第一种解决方案:使用所显示的示例,请尝试以下awk程序。使用awk的match函数来匹配正则表达式tag="[^"]*,它将匹配从标记='到下一次出现之前的所有内容。打印时,只打印匹配部分的sub-string,删除不需要的部分以获得版本部分。 awk 'match($0,/tag="[^"]*/){print substr($0,RSTART+5,RLENGTH-5)}' Input_fi...
awk -F'\t|,' '{print $1, $2}' input.txt 在上述命令中,-F'\t|,'指定了两个分隔符,即制表符和逗号。$1和$2分别表示第一个和第二个字段。 另外,Awk还支持正则表达式作为分隔符,可以使用斜杠/将正则表达式括起来。例如,使用正则表达式匹配连续的多个空格作为分隔符: ...
$ awk -F ":" '{if($3 ==0 ) print $1"是超级用户";else if($3>1&&$3<=999) print $1"是系统用户"; else print $1"是普通用户"}' passwd root是超级用户 bin是普通用户 daemon是系统用户 adm是系统用户 lp是系统用户 sync是系统用户 shutdown是系统用户 使用awk命令来输出passwd文件里哪些是超...
1 awk '{print $1}' user_info > uids.txt 如果是想获取用户123456789的好友列表,并且想输出为一列,可以进行如下操作:1 awk '$1==123456789{split($2,friends,",")}END{for(idx in friends){print friends[idx];}}' user_info 上述的pattern,就是uid为123456789,action就是将其好友列表打印出来。
I want to use a variable in the matching of regular expression field i.e i am reading a string from the user and I want to match it in awk against the whole file read var; cat int_out.txt | awk /var instead of reg exp/ { print $1}; ...
1. Awk While Loop Example: Create a string of a specific length $awk 'BEGIN { while (count++<50) string=string "x"; print string }' xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx The above example uses the ‘BEGIN { }’ special block that gets executed before anything else in an Aw...
One of its most versatile features is the ability to print specific fields and columns from a file based on predefined delimiters. Please refer to our previous tutorials in theAwkseries: How to Filter Text or String Using Awk and Regular Expressions – Part 1 ...
indexed by string values. The special operator in may be used to test if an array has an index consisting of a particular value: if (val in array) print array[val] If the array has multiple subscripts, use (i, j) in array. The in construct may also be used in a for loop to ...
If the value is a string, rather than a number, it is converted to a number. Consider this example: awk '{ print $NR }' Recall that NR is the number of records read so far: one in the first record, two in the second, and so on. So this example prints the first field of the...