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Passing Arguments in Shell Scripts

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# 1  
Old 02-28-2009
Passing Arguments in Shell Scripts
Hello everybody! First time posting hereSmilie

Right, I am trying to pass arguments in my shell scripts using $1, $2 and $3 etc using if else statement........

This is my shell script which is based on serching the google website

Code:
#!/bin/sh
wget  -t1  -E -e robots=off - -awGet.log -T 200 -H -Priserless -O mylist1.html -U "Mozilla" "classical+music&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a"
cat mylist1.html |sed -e 's#<a href#\n<a href#g' >mylist2.html
cat mylist2.html |sed -e 's#</a>#</a>\n#g' >mylist3.html
cat mylist3.html |sed -n -e '/^<a href="http:/p' >mylist4.html
cat mylist4.html |sed -n -e '/\.google/!p' >mylist5.html
cat mylist5.html |sed -n -e '/[0-9]*[0-9]*[0-9]*\.[0-9]*[0-9]*[0-9]*\.[0-9]*[0-9]*[0-9]*\.[0-9]*[0-9]*[0-9]*/!p' >mylist6.html

Could somebody please quide me through!

Thanks

Kev
# 2  
Old 02-28-2009

I don't see any arguments used in your script, nor an if ... else statement.
# 3  
Old 02-28-2009
Quote:
Originally Posted by cfajohnson

I don't see any arguments used in your script, nor an if ... else statement.
Thanks "cfajohnson" for replying.....

What I am trying to do is to pass arguments in my script such as
-h, -- help, -v, --version, -V, --Verbose, -o filename, --output=filename
-s searchphrase, --search=searchphrase, -f format, --format=format

Since I am a beginner in shell scripting I am not able to figure it out.....
# 4  
Old 02-28-2009
Code:
args=
while [ $# -ge 1 ]
do
  case $1 in
    -h | --help) echo help; exit ;;
    -v | --version) echo Version 0.01; exit ;;
    -V | --Verbose ) versbose=1 ;;
    -o ) filename=$2; shift ;;
    -o*) filename=${1#-o} ;;
    --output=) filename=${1#*=} ;;
    -s) searchphrase=$2; shift ;;
    -s*) ${1#-s} ;;
    --search=) searchphrase=${1#*=} ;;
    -f) format=$2; shift ;;
    -f*) format=${1#-f} ;;
    --format=) format${1#*=} ;;
    -*) echo invalid option >&2; exit 1 ;;
    *) args="$args
$1"
       ;;
  esac
  shift
done
oldIFS=$IFS
IFS='
'
set -f
set -- $args
IFS=$oldIFS
set +f

Last edited by cfajohnson; 02-28-2009 at 05:08 PM.. Reason: Modified to preserve non-option arguments
# 5  
Old 02-28-2009
Quote:
Originally Posted by cfajohnson
Code:
while :
do
  case $1 in
    -h | --help) echo help; exit ;;
    -v | --version) echo Version 0.01; exit ;;
    -V | --Verbose ) versbose=1 ;;
    -o ) filename=$2; shift ;;
    -o*) filename=${1#-o} ;;
    --output=) filename=${1#*=} ;;
    -s) searchphrase=$2; shift ;;
    -s*) ${1#-s} ;;
    --search=) searchphrase=${1#*=} ;;
    -f) format=$2; shift ;;
    -f*) format=${1#-f} ;;
    --format=) format${1#*=} ;;
    -*) echo invalid option >&2; exit 1 ;;
    *) break ;;
  esac
  shift
done

SIR you are a geniusSmilie

okay so according to your code:
Code:
-s) searchphrase=$2; shift ;;

So my case statement for $2 would look like this?:
Code:
case $2
echo 'wget  -t1  -E -e robots=off - -awGet.log -T 200 -H -Priserless -O mylist1.html -U "Mozilla" "classical+music&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a"'

case $3 ....and so on

Please correct me if I am wrong

Thanks a Mil!
# 6  
Old 02-28-2009
Quote:
Originally Posted by kev_1234
okay so according to your code:
Code:
-s) searchphrase=$2; shift ;;

So my case statement for $2 would look like this?:

No, you only need the one case statement; it reads all the parameters on the command line. Whatever was passed as the argument to -s will be in the variable $searchphrase.
Quote:
Code:
case $2
echo 'wget  -t1  -E -e robots=off - -awGet.log -T 200 -H -Priserless \
 -O mylist1.html -U "Mozilla" \
"classical+music&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a"'


That line doesn't use anything that has been passed on the command line (it also lacks a URL), so why do you need to parse anything to use it?
# 7  
Old 02-28-2009
Quote:
Originally Posted by cfajohnson
That line doesn't use anything that has been passed on the command line (it also lacks a URL), so why do you need to parse anything to use it?
Yup you are correct

Quote:
Originally Posted by cfajohnson
No, you only need the one case statement; it reads all the parameters on the command line. Whatever was passed as the argument to -s will be in the variable $searchphrase.
Sorry sir, could you explain this part please!!!Smilie

Because say if the user runs "test -s" in the command line will the output go to standard output?

Thanks
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