/usr/bin/shellex is in shellex 0.2-1.
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 | #!/bin/sh
# shellex - shell based launcher
# This is a short shellscript to set some needed variables and defaults.
# See shellex(1) for information on invocation.
# © 2013 Axel Wagner and contributors (see also: LICENSE)
SHELLEX_PRELOAD="/usr/lib/shellex/shellex_preload.so"
export SHELLEX_SIZE_FILE=$(mktemp -t shellex-size-XXXXXXXX)
exec urxvt -perl-lib /usr/lib/shellex/urxvt -pe shellex -override-redirect -name shellex $* -e env LD_PRELOAD=$SHELLEX_PRELOAD zsh -f
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