topics/unix/shellScripts/csh.and.tcsh/tipsAndTricks.txt


P. Conrad for CISC474, Spring 2006


Testing whether an environment variable is set


if $?INFOPATH == 0 then
 echo "initializing INFOPATH to empty string"
 setenv INFOPATH
else
 echo INFOPATH is initialized to $INFOPATH
endif