*.dep.  Files list each file on which a target depends, after its checksum (e.g. the output of md5sum).
*.tr.  Translate one target into another.  Use the target contained in the file to build the target named by the file.  Useful for multiple targets (e.g. y.tab.h.tr contains calcy.c).
.SUFFIXES.  Credo doesn't need the .SUFFIXES target because the user explicitly specifies which production rule to use in the first four parameters to libdo.  To get the advantage of credo figuring out for you which productions to use, try using the deduce script.
/lib/do.  Library of shell scripts or programs to produce file outputs from file inputs on which they depend.  A do script or program in given one parameter, the name of the file to create.  Each smith has its own library.
/lib/env.  Library of shell scripts or programs to set shell-environment variables, usually building up definitions by adding to the current value.
adddep rmdep.  Credo scripts to maintain file dependencies (including /env/ files) for a target.
addenv rmenv.  Credo scripts to set and clear environment variables per target, or as a default for all targets in the directory.
c.  Emulate early Unix (not necessarily Posix).
cache miss.  Credo redoes a target if the list of dependencies changed, or the content of any dependency changed; if the target’s do script changed; if the target file does not exist; if the translated target, used instead of the given target, does not exist; or if any non-/env/ dependency file does not exist.
calcy.  Test case of simple calculator to compile and link lex and yacc source.  Verify credo understands yacc generates multiple outputs.
credeper.  Credo script to process dependencies of a credo target.
credir.  Shell variable names another directory which contains source code.
credo.  Credo script to queue credo targets.
credoer.  Credo script to process a target.
crelock.  Credo script to sleep until credo finishes redoing a file, and mark it redoing.
crepare.  Credo script to prepare a dependency target for parallel execution.
deduce.  Credo script finds (and optionally executes with -x) a libdo command for a target.  It prefers productions with an output extension of the target, and an input extension of an available file.  Additional arguments, past the first target argument, filters the list of libdo commands.
dictionary.  File defines terms used by credo.
do library.  See /lib/do.
do scripts.  See /lib/do.
drake.  Test case of data processing from a trivial example.
env library.  See /lib/env.
env scripts.  See /lib/env.
ferc.  Emulate trivial drake processing of files from the FERC data source.
gnumake.  Emulate FSF’s GNU Make.
helloworld.  Tutorial describes a simple C compilation.
install.  File guides integrating credo with an Inferno installation.
libdo.  Credo script to copy a script from the do library into the current directory.
libenv.  Credo script to copy a script from the env library into the current directory.
line count.  285 sh source lines that are not comments, empty, or have only open or close braces.
lsenv.  Credo script to list environment variables on which targets in this directory depend.
lssrc.  Credo script to list source code files (i.e. dependencies without do files) for this directory's targets.
multiout.  Test case of multiple outputs in the abstract.
principles.  File reviews what credo believes, and what it’s trying to do.
psmith11.  File describes how credo relates to other build tools and environments, and explores specific changes to bring credo up to par.
regress.  Script to run all credo *.test cases.  Uses pastout to list differences in output from the past run.
smith.  A tool or document or (sub)system which defines a set of shell variables or file productions.  The level of directories under /lib/do and /lib/env.
todo.  File lists what needs done to make credo better.
todont.  File explains what should be left undone, to avoid making credo worse.
translate target.  See *.tr.