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Home >Shell scripting > Cheking parameters have been passed to shell file, comparing strings in if construct

This shell script file contains:

a control to guarantee that values are passed
two if statment checking if string values are equals or not

#!/usr/bin/ksh
#tested on HP-UX dec 2004
#file control_example.ksh


#check if value or parameter passed, if not exit
# note: be carefull shell scripting sintax. For instance the following if contruct needs a space after and before [  ....   ] 
# and new line for then and fi 

if [ $# -ne 1 ]
 then
    echo "Need  value !!"
    echo "Usage   : $0 value " 
    echo "Example : $0 apple"     
    exit 1      
fi  


# comparing string content first parameter passed
# equal 
# note the use slash before double quotes \"


if [ $1 = "apple" ]
then
echo "The value passed  is  \"apple\""         
fi

# not equal
if [ $1 != "orange" ]
then
echo "The value passed is not       \"orange\""   
fi


# $0 is the name of file that is being executing

echo "The name of this  file is $0"

# $1 is the first parameter 
echo  "Simple shell scripting \n  Current value passed was   $1 "

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Warning: include(): Failed opening 'ads/text468x15.html' for inclusion (include_path='.;C:\php\pear') in D:\inetpub\webs\fishscriptcom\documents\view_document.php on line 131

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