Linux Awk帮助代码

Question

I need to print the contents of a file, and give a title to each column, leaving enough space to be readable, and then I need to output this into a new file. I followed this tutorial for a good while but I've gotten stuck.

http://www.thegeekstuff.com/2010/01/awk-introduction-tutorial-7-awk-print-examples

This is the example code they use, which would give me exactly what I need to do with mine. But it will not work when I adjust it.

$ awk 'BEGIN {print "Name\tDesignation\tDepartment\tSalary";}
{print $2,"\t",$3,"\t",$4,"\t",$NF;}
END{print "Report Generated\n--------------";
}' employee.txt

This is mine, as unlike the example, I want the whole document printed and don't really want this "report generated" nonsense under it. I tried adding {print;}' to the end after end, and made sure to start a new line and... nothing.

$ awk 'BEGIN {Print "Firstname\tLastname\tPoints";} END > awktest.txt > done

Where have I gone wrong? It keeps giving me the response Source line 2.

Answer 1

To remove the footline, just drop out anything starting from END till the closing ':

awk 'BEGIN {print "Name\tDesignation\tDepartment\tSalary";} {print $2,"\t",$3,"\t",$4,"\t",$NF;}' employee.txt

In your second example, you left out the closing ', and I suspect you put one more ">" than needed:

awk 'BEGIN {print "Firstname\tLastname\tPoints";}' awktest.txt > done

The latter example will however silently ignore everything read from "awktest.txt".

Answer 2

It seems you have missed out the actual printing of the columns and a source file, also I read that you don't need any END actions...

awk 'BEGIN {Print "Firstname\tLastname\tPoints";} END > awktest.txt > done`

Should be...

awk 'BEGIN {Print "Firstname\tLastname\tPoints";}{print $1,"\t",$2,"\t",$3;}' source_file.txt > awktest.txt`

Just remember to change the $1,$2,$3 to what columns on the source file you need.

FYI. I'm no expert, just reading the tuts :)

Answer 3

It looks like what you need is just to insert a header line, which can easily be done with sed (as well as awk ) or with cat

$ sed '1iFirstname\tLastname\tPoints' file > output.file

or

$ awk 'BEGIN{print "Firstname\tLastname\tPoints"} 1' file > output.file

or

$ cat <(echo -e "Firstname\tLastname\tPoints") file > output.file

Answer 4

The awk print function is named print , not Print . idk why all the solutions are including ,"\\t", in their print statements. You don't want that - you want to set -v OFS='\\t' at the start of the script and then just use , between fields. All you want is:

awk -v OFS='\t' '
BEGIN {print "Name", "Designation", "Department", "Salary"}
{print $2, $3, $4, $NF}
}' employee.txt

assuming those are the correct field numbers you want to print from your data. Sample input/output in your question would be extremely useful to help us answer it.