Environment Variables Recognized

Environmental variables are passed to any child processes or screens you create by invoking an external utility or application. When Hamilton C shell starts up it looks for the ones shown here to be defined in the environment it inherits. COLORS, COMSPEC, CSHTITLE, DUPLICATES, HIGHLIGHT, HOME, MATCHFAIL, PATH, PROMPT1, PROMPT2, and SHELL are special: if they’re not already defined, then the shell creates them.

Environmental variables are not case-sensitive, so, e.g., Path and PATH refer to the same thing.

Name	Default	Use
ADDITIONS	Bright White on Green	Lines added found by diff.
ASCIICONVERT	Bright Yellow	ASCII files which received line end conversions by tar.
CDPATH		List of directories to search for the subdirectory specified as the new current directory.
COLORS	null	Normal screen colors.
COMSPEC		Usually, this is the pathname of cmd.exe. If you set it to point to the C shell, e.g., so other programs will invoke the C shell rather than cmd.exe, the C shell will try to look through the search path for cmd.exe if it needs to run a .cmd file.
CSHOPTIONS		Default set of command line options to be pasted ahead of any other command line options passed to csh.exe.
CSHTITLE		Template for the title bar. Setting it to a null string causes the title bar inherited at startup to be displayed. Unsetting it causes “Hamilton C shell” to be displayed. Other values will be evaluated for command and variable substitutions the same way the prompt variables are interpreted.
DELETIONS	Bright White on Red	Lines deleted found by diff.
DIRECTORIES	Bright	Directories listed by ls.
DRIVEMASK		Used by du, pwd and vol and drive wildcarding (e.g., “*:foo.*”) to limit the default list of drives it will report on. Written as a list of alphabetic characters representing the drives you want listed; ranges are allowed. If you don’t define this variable, all drives beginning with C: are normally reported.
DUPLICATES	Green	When filename completion matches more than one name.
ESCAPESYM	^	Character to be interpreted as a literal escape character. Placed in the environment only if it is not the default circumflex.
FOREIGNFILES	Bright Red	Filetypes in a tar file that have no counterparts on Windows.
HIGHLIGHT	Bright	Current disk or directory.
HOME		Home directory (default is the initial current directory.)
LATITUDE		Latitude setting used by sunrise.csh to calculate sunrise and sunset times..
LONGITUDE		Longitude setting used by sunrise.csh to calculate sunrise and sunset times..
LSOPTIONS		Default set of command line options to be pasted ahead of any other command line options passed to ls.
MATCHFAIL	Bright Red	When filename or command completion doesn’t match anything.
MIXEDCASEDRIVES		List of drives and UNC names for which ls, pwd, wildcarding and the fullname and current directory functions should report filenames in mixed case rather than all lower case.
MOREEOF	Green	End or Top of File in more.
MOREERROR	Bright White on Red	Unrecognizable command to more.
MOREFILLIN	Black	User response to more prompt.
MOREPROMPT	Red on White	Prompt line in more.
MORETOPMEM	Bright Yellow	Top of Memory message from more.
PATH		Search path for executable files.
PROMPT1	$@ $CDISK%	Primary command prompt template.
PROMPT2	$@ $CDISK?	Continuation line prompt template.
RADIX	16	Default radix used by more and other utilities when displaying binary data.
READONLYDIRS		Used by ls and other utilities for directories marked read-only.
READONLYFILES		Used by ls and other utilities for files marked read-only.
SHELL		Always set to the pathname of the Hamilton C shell csh file.
SWITCHCHARS	-/	Characters that can be used as option introducers for the shell and utilities.
SYSTEMDIRS	Bright Green	Used by ls for directories with the System bit on.
SYSTEMFILES	Green	Used by ls for files with the System bit on.
TABS	8	Used by more, head, tail and tabs to tell them how many character positions there are between tab stops.
TAPE	\\.\tape0	Used by mt under Windows to specify the pathname of the default tape drive.
TARASCII		Used by tar to identify files, using a list of wildcards, that should be considered as ASCII, regardless of content.
TARBINARY		Used by tar to identify files, using a list of wildcards, that should be considered as binary, regardless of content.