setting and displaying variables Post: 302507291

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Top Forums Shell Programming and Scripting setting and displaying variables Post 302507291 by zhshqzyc on Wednesday 23rd of March 2011 11:43:28 AM

03-23-2011

Registered User

No, it is not my homework. It is a bash practice problem from
Bash Guide for Beginners
I am using Linux fedora 14. I just want to improve myself.

Thanks.

---------- Post updated at 11:43 AM ---------- Previous update was at 11:35 AM ----------

How to modify profile?

Code:

# /etc/profile

# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc

# It's NOT good idea to change this file unless you know what you
# are doing. Much better way is to create custom.sh shell script in
# /etc/profile.d/ to make custom changes to environment. This will
# prevent need for merging in future updates.

pathmunge () {
    case ":${PATH}:" in
        *:"$1":*)
            ;;
        *)
            if [ "$2" = "after" ] ; then
                PATH=$PATH:$1
            else
                PATH=$1:$PATH
            fi
    esac
}


if [ -x /usr/bin/id ]; then
    if [ -z "$EUID" ]; then
        # ksh workaround
        EUID=`id -u`
        UID=`id -ru`
    fi
    USER="`id -un`"
    LOGNAME=$USER
    MAIL="/var/spool/mail/$USER"
fi

# Path manipulation
if [ "$EUID" = "0" ]; then
    pathmunge /sbin
    pathmunge /usr/sbin
    pathmunge /usr/local/sbin
else
    pathmunge /usr/local/sbin after
    pathmunge /usr/sbin after
    pathmunge /sbin after
fi

HOSTNAME=`/bin/hostname 2>/dev/null`
HISTSIZE=1000
if [ "$HISTCONTROL" = "ignorespace" ] ; then
    export HISTCONTROL=ignoreboth
else
    export HISTCONTROL=ignoredups
fi

export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL

for i in /etc/profile.d/*.sh ; do
    if [ -r "$i" ]; then
        if [ "$PS1" ]; then
            . $i
        else
            . $i >/dev/null 2>&1
        fi
    fi
done

unset i
unset pathmunge

zhshqzyc

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LEARN ABOUT SUNOS

profile

profile(4)							   File Formats 							profile(4)

NAME

       profile - setting up an environment for user at login time

SYNOPSIS

       /etc/profile

       $HOME/.profile

DESCRIPTION

       All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence.

       /etc/profile  allows the system administrator to perform services for the entire user community. Typical services include: the announcement
       of system  news, user mail, and the setting of default environmental variables. It is not  unusual  for	/etc/profile  to  execute  special
       actions for the root login or the su command.

       The  file  $HOME/.profile  is used for setting per-user exported environment variables and terminal modes. The following example is typical
       (except for the comments):

	      # Make some environment variables global
	      export MAIL PATH TERM
	      # Set file creation mask
	      umask 022
	      # Tell me when new mail comes in
	      MAIL=/var/mail/$LOGNAME
	      # Add my /usr/usr/bin directory to the shell search sequence
	      PATH=$PATH:$HOME/bin
	      # Set terminal type
	      TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid
	      while :
	      do
		      if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ]
		   then break
		      elif [ -f /usr/share/lib/terminfo/?/$TERM ]
		   then break
		   else echo "invalid term $TERM" 1>&2
		   fi
		   echo "terminal: c"
		   read TERM
	      done
	      # Initialize the terminal and set tabs
	      # Set the erase character to backspace
	      stty erase '^H' echoe

FILES

       $HOME/.profile	       user-specific environment

       /etc/profile	       system-wide environment

SEE ALSO

       env(1), login(1), mail(1), sh(1), stty(1),  tput(1), su(1M), terminfo(4), environ(5), term(5)

       Solaris Advanced User's Guide

NOTES

       Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better  for  serving  all  but  the  most
       global needs.

SunOS 5.10							    20 Dec 1992 							profile(4)