Help executing command loaded from file

GoldenEye4ever · #1 (**permalink**) 03-17-2009

I need to execute a command that is loaded from a file.

Basically, we have several scripts that need to be run at scheduled times.
We're going to store those times in the database and update a file with data.
In that file we'll have scriptName, inputParameters, runTimes, etc...
I chose to use tilda (~) as the delimiter as it can't be used by any of the input variables

I got it all working, with one exception.
If an inputParameter needs to be executed (current date `date +'%d%m'`)

Then I get this error:

Code:

./chk_master_script.sh[247]: `date +%m%d`:  not found
Launching script (with parameters): $HOME/daily/scripts/workit.sh

This is roughly how I load the data:

Code:

if [ -s ${masterDataFile} ]; then
  fileExists=true
  IFS="~"
  while read workerScript parameters timingStuff; do
    ...
    params=`${parameters}`
    echo "Launching script (with parameters): ${workerScript} ${params}"
    ...
  done

File Layout:

Code:

filename~parameters~schedulingStuffHere

Sample File Contents:

Code:

workerScript.sh~`date '+%m%d'`~stuffGoesHere

Thanks

cfajohnson · #2 (**permalink**) 03-17-2009

Quote:

Originally Posted by GoldenEye4ever

I need to execute a command that is loaded from a file.

Basically, we have several scripts that need to be run at scheduled times.
We're going to store those times in the database and update a file with data.

Wouldn't it be easier to use a cron job?

Quote:

In that file we'll have scriptName, inputParameters, runTimes, etc...
I chose to use tilda (~) as the delimiter as it can't be used by any of the input variables

I got it all working, with one exception.
If an inputParameter needs to be executed (current date `date +'%d%m'`)

Then I get this error:

Code:

./chk_master_script.sh[247]: `date +%m%d`:  not found
Launching script (with parameters): $HOME/daily/scripts/workit.sh

This is roughly how I load the data:

Code:

if [ -s ${masterDataFile} ]; then
  fileExists=true
  IFS="~"
  while read workerScript parameters timingStuff; do
    ...
    params=`${parameters}`

According to the contents you posted, the backticks are already there. Use eval to execute it:
Code:
eval "params=${parameters}"

Quote:

Code:

    echo "Launching script (with parameters): ${workerScript} ${params}"
    ...
  done

File Layout:

Code:

filename~parameters~schedulingStuffHere

Sample File Contents:

Code:

workerScript.sh~`date '+%m%d'`~stuffGoesHere

Thanks

Code:

if [ -s ${masterDataFile} ]; then
  fileExists=true
  
  while IFS="~" read workerScript parameters timingStuff; do
    ...
    eval "params=${parameters}"
    echo "Launching script (with parameters):"
    ${workerScript} ${params}
    ...
  done

Depending on the cntents of $params, you may need to quote the expansion:

Code:

${workerScript} "${params}"

GoldenEye4ever · #3 (**permalink**) 03-17-2009

Thanks a lot cfajohnson,
you rule

But now I have another question

I've got my attributes evaluated, however I need to consider if multiple attributes are passed through, as a single string

Basically, I need to tokenize the parameters string

This is what I have so far:

Code:

...
evalParams()
{
  output=""
  input="$1"
  set -A attr $(echo ${input} | tr ',' ' ' )
  
  n="0"
  while [ "${n}" -lt "${#attr[*]}" ];
  do
    eval "p=${attr[${n}]}"
    output="${output} ${p}"
    n=`expr $n + 1`
  done
  
  echo ${output}
}
...
## this is actually loaded from file, but for the purpose of an example it's fine :)
parameters="`date +%m%d`,`date +%H%M`"
...
params=`evalParams ${parameters}`

Unfortunately, it isn't working

The attr array isn't being populated as I expected,
the entrie parameter string just gets assigned to the 1st index (index 0)

As for cronjobs, we're trying to get our scheduling in the DB.
- We want our schedules to be centralized
- Makes learning the timings of the batch easier

cfajohnson · #4 (**permalink**) 03-17-2009

Code:

evalParams()
{
  oldIFS=$IFS
  IFS=,
  set -f
  set -- $1
  set +f
  IFS=$oldIFS

  for parm
  do
    eval "printf '%s ' $parm"
  done
}

GoldenEye4ever · #5 (**permalink**) 03-17-2009

Thank you so much

You are the best

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