UNIX for Dummies Questions & Answers

well i have some doubts about the use of this commands:


my first doubt is to know if there is a way to execute a awk program from a file? (now i do copy paste, i copy the script of a notepad on the terminal and then i press enter, but i want to put this scripts in some folder and execute them)

another doubt i have is how can i say to awk for retrieving all the information beside certaing pattern for example i want to get all the SBL codes except SBL151

Code:

awk ' {
        for(i=1;i<=NF;i++) {
                if($i ~ /SBL/ && $i <> /SBL151/ )
                        a[$i]++;
        }
} END {
        for(i in a)
                print i, a[i];
}' file

is this code ok?

other doubt is if is possible to use a switch in my code i have something like

Code:

awk ' {
        for(i=1;i<=NF;i++) {
                if($i ~ /SBL/)
                        a[$i]++;
                 if($i ~ /DBL/)
                        c[$i]++;
                 if($i ~ /XSL/)
                        d[$i]++;
                 if($i ~ /NBL/)
                        e[$i]++;

        }
} END {
        for(i in a)
                print i, a[i];
}' file

i want to make something like a switch based of i value instead of making 4 ifs.



and my last doubt is recently download gawk 3.1.2(awk for windows) but i cant make it work, i go with the cmd to the bin folder and then i try to copy paste the script of awk in the cmd and press enter but a lot of error codes are displayed. i dont know how to use this program, any of you have used it?, whats the process to run a script?


thanks for all!!

Well, you can put awk in a shell script first line "#!/bin/bash" or the like, or make a pure awk script "#!/bin/awk -f".

Syntax error:
Should be either another REGEXP

Code:

if ( $i ~ /SBL/ && $i !~ /SBL151/ )

or a string comparison

Code:

if ( $i ~ /SBL/ && $i != "SBL151" )

Maybe '/SBL/' should be '/^SBL[0-9]\{3\}$/' ?