Shell Programming and Scripting

Hi,

How can I create a file inside a script. The thing is that, I have to create the file inside the script and it will be acting as a log file the script.Whenever I execute the script the file has to be created and the output has to be directed into that file.


Tahnks in advance

You can do something like this.

Code:

#! /bin/ksh
[ ! -f "$0.log" ] && > $0.log

function log
{
  echo "$@" >> "$0.log"
}

Where ever you want to log the output, invoke the function as

Code:

log "Value is $value"

Hi ,
There are many was to create any file. Since your requirement is to create a file for keeping information log it would be advisable to have same name as the script name.

to create a new file use any one of the following :

> file_name
echo '' > filename

for appending any thing you can use " >> filename ".

Below is the sample code which would help you creating your own script.

script_name=$(basename "$0")
base_file_name=`echo $script_name | cut -f 1 -d "."`
logfile=${base_file_name}.log

echo " Started executing ${script_name} at `date` \n > ${logfile}

echo "Start appening msg to the file like this " >> ${logfile}



-Manish Jha.

Hi.

Thanks. I got it. But I have a script that has defined a log file like this.

The name of the script is verify.sh
Inside the script there is some thing like this.
LOG=/usr/verify
TDATE=`date "+%m%d%y"$$`
LOGFILE=$LOG.$TDATE.

and inside the script it has been written as
echo "This is to verify" | tee -a $LOGFILE.

I understood that for every run this script will generate the mog file with the date appended to it. But I am not getting to know whether I have to create the file before running the script or the script will itself create the file. If I run the script as it is, it doesnt create the file.

Please put some light on how to run this script.

Thanks in advance.

It will create the file if it doesnt exist. From info tee

Code:

   If a file being written to does not already exist, it is created.
If a file being written to already exists, the data it previously
contained is overwritten unless the `-a' option is used.

The thing is that Its not creating the file if the file doesnt exist.

We cant say what is wrong without seeing the script.

Anyway, you can use add this line as well.

Code:

[ ! -f "$LOGNAME" ] &&  > "$LOGNAME"