[tex-live] how robustly call awk script?

Sanjoy Mahajan sanjoy at mrao.cam.ac.uk
Sun Jan 14 18:45:41 CET 2007

> It means that env took the "-f" option which you want to pass to awk.

Right.  I straced x.sh which is a simple script to total the numbers
on stdin (I use it to unbalance my checkbook):

#!/usr/bin/env awk -f
BEGIN {total=0};
{total += $1}
END {print total}

and it had these lines as it tried to find awk on the path:

execve("/usr/bin/awk -f", ["awk -f", "./x.sh"], [/* 36 vars */]) = -1
ENOENT (No such file or directory)

So env stupidly combines the -f with the program name, making argv[0]
= "awk -f", and searches for a binary named "/usr/bin/awk -f" (!)
which will never be found.

Without the -f, i.e. "#! /usr/bin/env awk", it won't work at all
because awk thinks the rest of the file are lines to be processed,
rather than pattern text.  So I think your solution is the only
portable one.


`Not all those who wander are lost.' (J.R.R. Tolkien)

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