$ 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...
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: ...
If the value is a string, rather than a number, it is converted to a number. Consider this example: awk '{ print $NR }' Recall that NR is the number of records read so far: one in the first record, two in the second, and so on. So this example prints the first field of the...
awk -F, '{if ($NF ~ /^|^/) print >"goodfile";else print >"badfile"}' filename sample data 1,abc,def,1234,A * 2,bed,dec,342,* A ... 2. Shell Programming and Scripting sed or awk command to replace a string pattern with another string based on position of this string ...
$ awk '{ print "hello" } # let's be cute' > The shell sees that the first two quotes match, and that a new quoted object begins at the end of the command line. It therefore prompts with the secondary prompt, waiting for more input. With Unix awk, closing the quoted string produce...
Star1.9k Files master bugs-fixed testdir .gitignore ChangeLog FIXES FIXES.1e LICENSE README.md REGRESS TODO awk.1 awk.h awkgram.y b.c lex.c lib.c main.c makefile maketab.c parse.c proto.h run.c tran.c Breadcrumbs awk /
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}; ...
In the following example, the program outputs all the lines starting with "A". If the specified string is a part of a larger word, it is also printed. awk '$1 ~ /^A/ {print $0}' employees.txt Relational Expression Patterns Another type ofawkpatterns are relational expression patterns. ...
Fields need not be referenced by constants: n = 5 print $n prints the fifth field in the input record. The variable NF is set to the total number of fields in the input record. References to non-existent fields (i.e. fields after $NF) produce the null-string. However, assigning to...
Hello, I am new to awk and an trying to extract a part of a string. The sting has a delimiter of "_" and I want to extract the string...