concat_daily_hist.csh is a script in CIMEROOT/scripts/Tools.
System Message: ERROR/6 (/home/titters/devel/E3SM/cime/master/doc/source/Tools_user/concat_daily_hist.csh.rst, line 13)
Command ['./concat_daily_hist.csh', '--help'] failed: [Errno 2] No such file or directory: './concat_daily_hist.csh'