PGP encryption issue with Crontab

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1. The problem statement, all variables and given/known data:
   PGP encryption works manually but not with crontab

2. Relevant commands, code, scripts, algorithms:
   Below Command works fine manually
   pgp --encrypt $file_path --recipient "publickey" -v --home-dir /$HOME/alice/.pgp/
   But the same command when included in a test.sh and scheduled through crontab, it gives "pgp: not found" error

3. The attempts at a solution (include all code and scripts):

I assume that crontab kicks off with root user and the root user is unable to find the location of pgp installed in the user alice.
Specified --home-dir argument explicitly, even then it didn't work.

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
   WIP, IL, USA

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This problem is so common it's in our FAQ.

cron runs with a very minimal PATH. Try /absolute/path/to/php instead of just pgp.

Thanks for the reply Corona688.
Tried it with absolute path /opt/pgp/bin/pgp, manually it works. But, with crontab it gives ld.so.1: pgp: fatal: relocation error: file /opt/pgp/lib/libstdc++.so.6: referenced symbol not found.
Further, I tried to set environment variable $LD_LIBRARY_PATH to include /opt/pgp/bin using below command:
set $LD_LIBRARY_PATH = /opt/pgp/lib:$LD_LIBRARY_PATH.
Still the LD_LIBRARY_PATH value remains the same (It's not updated)
Please suggest

Hmmm. Trickier, if it's installed in /opt. Do you have LD_LIBRARY_PATH set in your shell? What does ldd /opt/pgp/bin/pgp print?

What shell are you running under?

csh uses "setenv VAR value" (note the lack of an "="...), bash/sh uses "VAR=value; export VAR".

I have no idea what "set $LD_LIBRARY_PATH=..." does.