linux shell編程2

#! /bin/sh
echo "Current command is $0"
echo "The first parameter is $1"
echo "The second parameter is $2"
echo "The third parameter is $3"
echo "Total of parameters if $#"
echo "Current PID is $$"

#!/bin/bash
times=0
until [ "$times" = 3 ];
do
  echo "I love linux."
  sleep 2
  times=`expr $times + 1`
done
  
#!/bin/bash
# menu shell script.      samli     2004.4.19
until 
       echo "List Directory..........1" 
       echo "Change Directory........2" 
       echo "Edit File...............3" 
       echo "Remove File.............4" 
       echo "Exit Menu...............5" 

       read choice 
       test $choice = 5
do 
       case $choice in 
              1) ls;; 
              2) echo "enter target directory:" 
              read dir 
              cd $dir 
              ;; 
              3) echo "enter file name:" 
              read file 
              vi $file 
              ;; 
              4) echo "enter file name:" 
              read file 
              rm $file 
              ;; 
              5) echo "Goodbye"
              ;; 
              *) echo "illegal option, please input again." 
       esac 
done 

#! /bin/sh
var1="abcd  efg"
echo $var1
var2=1234
echo "The value of var2 is $var2"
echo  $HOME
echo  $PATH
echo  $PWD

#! /bin/sh
num=0
while [ $num -le 10 ]
do
    num=`expr $num + 1`
       if [ $num -eq 5 ]
       then
              continue  
       fi
    square=`expr $num \* $num`
    echo $square
done

#!/bin/bash 
# Gnu bash versions 2.x
# The Party Program--Invitations to friends from the 
# "guest" file 
guestfile=./guests  #  ~/shell/guests
if [[ ! -e "$guestfile" ]] 
then
       printf "${guestfile##*/} non-existent"
       exit 1
fi
export PLACE="Sarotini's"
(( Time=$(date +%H) + 1 ))
set cheese crackers shrimp drinks "hot dogs" sandwiches 
for person in $(cat $guestfile) 
do
       if  [[ $person = root ]]
       then
              continue
       else 
              # Start of here document
              mail -v -s "Party" $person 
              Hi ${person}! Please join me at $PLACE for a party! 
              Meet me at $Time o'clock.
              I'll bring the ice cream. Would you please bring $1 
              and anything else you would like to eat? Let me know 
              if you can't make it.
                     Hope to see you soon.
                           Your pal,
                           ellie@$(hostname)
              FINIS
              shift 
              if (( $# ==  0 )) 
              then
                     set cheese crackers shrimp drinks "hot dogs" sandwiches
              fi
        fi
done              
printf "Bye..." 

#!/bin/sh 
# Standard AT&T Bourne Shell 
# The Party Program--Invitations to friends from the 
# "guest" file 
guestfile=./guests   # /home/ellie/shell/guests
if [ ! -f "$guestfile" ] 
then
       echo "慴asename $guestfile?non-existent"
       exit 1
fi
PLACE="Sarotini's"
export PLACE
Time=`date +%H`
Time=`expr $Time + 1`
set cheese crackers shrimp drinks "hot dogs" sandwiches 
for person in $(cat $guestfile) 
do
       if  [ $person = root ]]
       then
              continue
       else 
              # Start of here document
              mail -v -s "Party" $person 
              Hi $person! Please join me at $PLACE for a party! 
              Meet me at $Time o'clock.
              I'll bring the ice cream. Would you please bring $1 
              and anything else you would like to eat? Let me know 
              if you can't                                make it.
                     Hope to see you soon.
                           Your pal,
                           ellie@`hostname`
              FINIS
              shift 
              if [ $# -eq  0 ] 
              then
                     set cheese crackers shrimp drinks "hot dogs" sandwiches
              fi
        fi
done              
echo "Bye..." 


#!/bin/sh
# Scriptname: args
# Script to test command line arguments
echo The name of this script is $0.
echo The arguments are $*.
echo The first argument is $1.
echo The second argument is $2.
echo The number of arguments is $#.
oldargs=$*
set Jake Nicky Scott                    # reset the positional parameters
echo All the positional parameters are $*.
echo The number of postional parameters is $#.
echo "Good~Vbye for now, $1 "
set $(date)                       #  reset the positional parameters
echo The date is $2 $3, $6.
echo "The value of \$oldargs is $oldargs."
set $oldargs
echo $1 $2 $3
# Name: bigfiles
# Purpose: Use the find command to find any files in the root
# partition that have not been modified within the past n (any
# number within 30 days) days and are larger than 20 blocks
# (512 byte blocks)

if (( $# != 2 ))   #  or     [ $# -ne 2 ]
then
   echo  "Usage:   $0 mdays size " 1>&2
   exit 1
fi
if (( $1   0 || $1 > 30 )) #  or  [ $1 -lt 0 -o $1 -gt 30 ]
then
   echo "mdays is out of range"
   exit 2
fi
if (( $2    #   or  [ $2 -le 20 ]
then
   echo "size is out of range"
   exit 3
fi
find / -xdev -mtime $1 -size +$2

#!/bin/bash
# Scriptname: checker
# Script to demonstrate the use of special variable
# modifiers and arguments
name=${1:?"requires an argument" }
echo Hello $name
#!/bin/bash
# This is the first Bash shell program of the day.
# Scriptname: greetings
# Written by:  Barbara Bashful
echo "Hello $LOGNAME, it's nice talking to you."
echo "Your present working directory is `pwd`."
echo "You are working on a machine called `uname -n`."
echo "Here is a list of your files."
ls      # list files in the present working directory
echo  "Bye for now $LOGNAME. The time is `date +%T`!"
#!/bin/bash
# Scriptname: greetings2
echo "This script is called $0."
echo  "$0  $1 and $2"
echo "The number of positional parameters is $#"
#!/bin/bash
# Scriptname: idcheck
# purpose:check user id to see if user is root.
# Only root has a uid of 0.
# Format for id output:uid=9496(ellie) gid=40 groups=40
# root's uid=0

id=`id | gawk -F'[=(]'  '{print $2}'`     # get user id
echo your user id is:  $id
if  (( id == 0 ))    # or   [ $id -eq 0 ]
then
   echo "you are superuser."
else
   echo "you are not superuser."
fi