Environment variables in GAWK

In this section, we discuss the various GAWK-specific variables. They are not available in the original AWK distribution. However, on modern Linux systems, generally these options will work because AWK is set as a symbolic link to the GAWK executable.

ARGIND

ARGIND represents the index in the ARGVarrayto retrieve thecurrent file being processed.When we operate with one file in AWK script, the ARGIND will be 1, and ARGV[ARGIND] will return the filename that is currently being processed.

In the following example, we print the value of ARGIND and the current filename using ARGV[ARGIND] as follows:

$ vi argind.awk

END    {
    print "ARGIND : ", ARGIND;
    print "Current Filename : ", ARGV[ARGIND];

}


$ awk -f argind.awk

The output of the execution of the preceding code is as follows:

ARGIND :  1
Current Filename :  cars.dat

We have printed the value stored in ARGIND in the END block here so that it is not printed in a loop when each line of cars.dat is processed.So...