#This file is named .profile
#The Korn shell executes the commands in this file when you log in.
#Page numbers in this file refer to the ksh(1) manual page.

#"export" (p. 41) creates an environment variable (pp. 23-24).

#Directories shell searches for executables: pp. 16, 27.  gcc is C compiler.
export PATH=$PATH:/opt/gcc453/bin:.

#The -t option of man makes man run this program.
#~mm64 is the full pathname of mm64's home directory: pp. 4-5.
export TCAT=~mm64/bin/tcat

#The editor to be invoked by mail, mailx, dbx, etc: p. 14.
export EDITOR=/bin/vi

#Make vi display the words INSERT MODE while you're in insert mode.
export EXINIT='set showmode'   #or export EXINIT='set showmode number'

#The name of the computer.
export HOST=`hostname`

#The Korn shell will check this file for new mail every 10 minutes: p. 16.
export MAIL=/var/mail/$LOGNAME

#Default printer for the lpr, lpq, lprm programs.
export PRINTER=edlab

#Source code directory on the web at http://i5.nyu.edu/~mm64/INFO1-CE9545/src/
export S45=~mm64/public_html/INFO1-CE9545/src

#if necessary to make your screen editor (vi, emacs, pico) work properly
export TERM=vt100

#Make the command numbers in the prompt start at 1 each time you log in:
#p. 27 for .sh_history.  ~ is the full pathname of your home directory: pp. 4-5.
rm -f ~/.bash_history

#Prompt string one.  See pp. 10-12 for chopping, p. 16 for !.
#The %%.* chops off the end of $HOST: i5.nyu.edu becomes i5
#The ##*/ chops off the beginning of $PWD: /home1/a/abc1234 becomes abc1234
PS1='! ${HOST%%.*}:${PWD##*/} $ '

#The following command must come *after* the export EDITOR=/bin/vi.
#otherwise the export EDITOR=/bin/vi would turn emacs mode back off (p. 12).

#Retrieve and edit previous commands with emacs, pp. 28-32.
#See pp. 46-50 for set.
set -o emacs

#Make the 4 arrow keys work in emacs mode, pp. 28-32.  Only in ksh93, sorry.
#/bin/loadkeys ~mm64/public_html/INFO1-CE9545/src/loadkeys_set

#Don't let control-d log you out (p. 48): must type "exit" (p. 41).
set -o ignoreeof

#Don't let > destroy the existing contents of a file: pp. 22, 49.
set -o noclobber

#For alias, see pp. 3-4, 39.
#"history" is itself an alias for "fc -l", pp. 4, 42.
alias h=history

#See all the jobs you're running, pp. 25, 43.
alias j=jobs

#/bin/mailx is better than /bin/mail.  Used in line 81.
alias mail=mailx

#Turn off last 2 r and w bits of a newborn file.  For example, date > newborn
#will create a newborn file whose bits are rw-------.  The octal argument of
#the umask command has a 1 in each bit that should be turned off.  See p. 55.
umask 077

#Let other people send you messages with the talk program.
#It turns on the two rightmost w bits of your terminal.
mesg y

#See new and unread mail in alphabetical order of who sent it.
#Can use an alias (mail) as first word of command, and also after | && || ;
mail -e && mail -H |
grep '^.[NU]..[0-9]' |
sort +0.6f -0.25 +0.6 -0.25 +0.2n

#date
#cal
#who | grep def5678
#~mm64/bin/moon