Specify other flags in awk script header

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Many systems allow only a single argument in a shebang line, so everything after the space is passed as one argument.

However, you can set FS and even ARGV in your script’s BEGIN block, like this:

#!/bin/awk -f              # using the #!/bin/awk -f
BEGIN {
    FS=":"                 # always use : as a field separator
    ARGC=2
    ARGV[1]="/etc/passwd"  # always run on the same file
}
$3==0 {                    # followed by some awk code
    print $1
}

Run it:

$ chmod u+x program.awk
$ ./program.awk
root

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