/usr/bin/Fsort is in ferret-vis 6.9.3-4build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #! /bin/sh
# sort a list of names given as arguments into increasing
# order based on their ~nnn~ version number extensions
# at most one name should be without ~nnn~
. /usr/share/ferret-vis/bin/ferret_paths
# example usage: Fsort metafile.plt*
# example in context: animate `Fsort metafile.plt*`
# ... or in a more complex example
# animate start_frame `Fsort series1.plt*` `Fsort series2.plt*` end_frame
echo "$*" | awk -f $FER_DIR/bin/Fsort.nawk
# Note:
# Here is an alternative version that uses sort for the "tilda" filenames
# and sed to put the filename with no tilda version number at the end:
# ls !* | sort -t\~ +1n | sed -e '/\~/\!h' -e '/\~/\!d' -e '$p' -e '$x'
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