/usr/bin/shrink_width is in libvips-tools 8.4.5-1build1.
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
# shrink to a target width
# default prefix
VIPSHOME=${VIPSHOME-/usr}
name=$0
bname=`basename $0`
if [ $# != 3 ]; then
echo "${bname}: usage: $bname <in> <out> <target width>"
exit 1
fi
inwidth=`$VIPSHOME/bin/vips im_header_int Xsize $1`
factor=`(echo scale=10; echo $inwidth / $3) | bc`
$VIPSHOME/bin/vips im_shrink $1 $2 $factor $factor
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