Shell Programming and Scripting

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#zxcvbnm
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#qwertyu
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#zxcvbnm
#qwertyuiop

sed 's/^/#/g' f.txt > result.txt             # first command
sed 's/^[^#]/#/g' f.txt > result.txt      # second command

sed 's/^[^#]/#&/g' f.txt > result.txt

#############################################################
## 
## Shell    : hDeploy
##
## Author     : Himanshu Kansal
##
## Date        : April 23, 2009 (Thursday)
##
## Description    : The shell takes in the Properties File Name,
##          Environment Name and Application Names as input
##          and edits the OM.props file accordingly.
##
## Version     : v0.01a
##
## Enhancements : It should be enhanced to take care of
##          1. Deployment steps.
##          2. New Initiatives/Applications.
## 
## Usage    : sh hDeploy <propsFile> <env> <app_1> [<app_2> ...]
##
## Notes     : 1. All parameters should be correct for desired o/p
##          2. If a parameter value is incorrect, run again 
##             with correct values
## Dependencies : apps.txt - Contains mapping of application names with numbers.
##
## TO-DO      : 1. Call cleanUp() wherever necessary. (Priority : low, Severity : Not Severe)
##
#############################################################

#!/bin/sh

################################################
##
## Function     : getEnvPath
## Objective    : Check if input env is valid
## Description     : Initialise path value of EAR if valid,
##          else exit with error message
## Date     : April 23, 2009
## Author    : Himanshu Kansal
## 
################################################
getEnvPath(){
    
    # Variables used :-
    # ==============
    # var : The environment argument passed

    var=$1    
    
    case "$var" in
        [CS]IT[1-4])            
            ;;
        PSDEV | PSSIT)            
            ;;
        *)            
            return 1
            ;;
    esac
    
    echo "/tmp/OM/OM_"${env}
}

################################################
##
## Function     : getAppNum
## Objective    : Get the number of application
## Description     : Return App Number according to App          
## Date     : April 28, 2009
## Author    : Himanshu Kansal
## 
################################################
getAppNum(){
    
    # Variables used :-
    # ==============
    # appName : Name of the application
    
    appName=$1    
    
    ## Check App Name and return 1 if NOT ok    
    findApp=`grep '^'"$appName"'=' ${appsFile}`
    if [ ${#findApp} -eq 0 ];then
        ## App Name not found, return 1
        return 1
    fi

    grep "${appName}" ${appsFile} | head -1 | awk -F"=" '{print $2}'
}

################################################
##
## Function     : giveUsage
## Objective    : Show the Shell Usage to user
## Description     : Prints the valid usage syntax
## Date     : May 19, 2009
## Author    : Himanshu Kansal
## 
################################################
giveUsage(){

    echo "USAGE :"
    echo "\tsh hDeploy <propsFile> <env> <app_1> [<app_2> ...]"
    
}

################################################
##
## Function     : uncomment
## Objective    : Un-comment a particular line
## Description     : Un-comments the input line and saves the changes source
##           file to destination file.
## Date         : June 1, 2009
## Author    : Himanshu Kansal
## 
################################################
uncomment(){

    # Variables used :-
    # ==============
    # lineToEdit    : The line ofthe file to edit
    # srcFile        : Source file to edit
    
    lineToEdit=$1
    srcFile=$2

    awk "/^#${lineToEdit}/{sub(/^#/,\"\")} 1" ${srcFile}

}

################################################
##
## Function     : cleanUp
## Objective    : Removes all the temporary files created
## Date         : June 1, 2009
## Author    : Himanshu Kansal
## 
################################################
cleanUp(){
    
    rm -rf htmp.props htmp2.props
        
}

# Variables used :-
# ==============
# env           : Environment for deployment
# envPath     : Path of the ear file for this environment
# propsFile     : The properties file to edit
# appsFile     : The file with number of apps


## Command-line Arguments:
## - $1     : propsFile
## - $2     : Environment
## - $3,... : Applications (Space separated values)

propsFile=$1    
env=$2
appsFile="apps.txt"

## Check if Props file is mentioned
if [ "${#1}" = "0" -o ! -s ${propsFile} ];then
    
    ## No Props File Name specified
    echo "\nA props file was not provided or File \"${propsFile}\" not found."
    giveUsage

    ## Safely exit with non-zero code
    exit 1
    
fi

## Get path for this environment
envPath=`getEnvPath "${env}"`

## Exit with message if environment is invalid
if [ $? -ne 0 ];then

    echo "\nInvalid Env \"${env}\": Exiting"
    giveUsage
    
    ## Safely exit with non-zero code
    exit 1    
    
fi 


echo "Environment Path : ${envPath}"


## Forget propsFile and env args, move to other args.
## Check if an Application Name(Eg: OMEAR) is provided.
if [ "${#3}" = "0" ];then

    ## No App Name specified
    echo "\nNo Application specified"
    giveUsage
    
    ## Safely exit with non-zero code
    exit 1
    
else
    
    shift 2
    
fi


#echo "Props File : ${propsFile}"
#cat ./${propsFile}


## Comment all lines in the props file
#echo "[[ Commenting all lines]]"

sed "s/^[^#]/#&/g" ${propsFile} > htmp.props

#echo "[[ Commented all lines ]]"
## Now "htmp.props" is the operation file

## Loop through all the applications specified.
## Get the application number for an app
## Edit the required lines for that app
## Move to next app
## The numbers are stored in file "apps.txt" for easy edit/review/update
for app in $*
do
    
    echo "${app}"
    
    ## Get app num
          appNum=`getAppNum "${app}"`
    #echo "[[App Num]] : ${appNum}"
    
    ## Check return value, exit if 1
    if [ $? -ne 0 ];then
        echo "Invalid Application : Skipping"        
        exit
    fi 

    echo "[[App Num]] : ${appNum}"
    
    ## Edit the required lines

    ## Uncomment line for App Name    
    uncomment "Application\.${appNum}\.name" "htmp.props" > htmp2.props

    ## Edit line for App EAR location
          sed "s~#Application\.${appNum}\.earFile=.*~Application\.${appNum}\.earFile=${envPath}/${app}.ear~g" htmp2.props > htmp.props

    ## Uncomment target cluster          
    #awk "/^#Application\.${appNum}\.target/{sub(/^#/,\"\")} 1" htmp.props > htmp2.props
    uncomment "Application\.${appNum}\.target" "htmp.props" > htmp2.props
          
          ## Un-comment 2 more lines for SMG3TestingToolEAR
    if [ ${app} = "SMG3TestingToolEAR" ];then                
        uncomment "ApplicationLibrary\.${appNum}\.appName" "htmp2.props" > htmp.props
        uncomment "ApplicationLibrary\.${appNum}\.libraryName" "htmp.props" > htmp2.props
    fi

    ## Update htmp.props for next application
    cat htmp2.props > htmp.props

done

## Finally, save result to required file
mv htmp2.props ${propsFile}
echo "File ${propsFile} edited."

cleanUp
exit 0

#####################################################
##            End Of File - hDeploy       ##
#####################################################