difference b/w job parameters and environment variables

[4friends]

anybody can explain the difference b/w job parameters and environment variables?

[ray.wurlod]

Environment variables are part of the (execution) environment - you can use them in operating system shells even on systems that don't have DataStage installed.

Job parameters are exactly what the name suggests; placeholders whose values are supplied when (before) a job run request is issued.

It is possible to use the value of an environment variable to provide a value to a job parameter.

[ray.wurlod]

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[Govindarajan]

Environment variables are at PROJECT level and can be used any jobs are sequencers developed under the project, Whereas job parameters are at job level. On top of it you can create a environment variable and re-assign the value at job level.