Thanks a lot. Indeed, with the BEGIN block, it now works.

In case someone is curious, I needed it in a shell script for a convoluted situation: to be able to un-mount a disk cleanly, I needed a smart sort on the mounted partitions of the disk.

# $dest was set to "sdb" through a shell argument 
mounted_disks=$(mount | perl -nae 'BEGIN{$d=shift}; push @m, $F[2] if 
+m{/dev/$d}; END{print join(" ", sort {length($b)<=>length($a)} @m)}' 
+$dest)
umount -l $mounted_disks

[download]

Thanks to Perl and the Perl Monks, it works.

In reply to Re^2: Differentiating STDIN from arguments when using -n ? by rduke15
in thread Differentiating STDIN from arguments when using -n ? by rduke15

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