dear ones

pl.kindly help me 1) how to print(grep) required pattern and following 2 or 3 lines. 2) grep required pattern(to print)+above 2 lines+below 2 or 3 lines.from a report file.

ex:
we have some report file
kf askfjsk fksaj fk skf sjfksjd kff sjfkjs kf jskdjfklsd jfklsdf sdkfjsd fsd
jkfsdja fkjsdklf jsdklfj klsdj fklsd jkfjsdkfj ksd jfksdjf 456015
jf sakjlf ksld flksdjklfj sakl jfklsdajklfj sdalfjsdj fksldjfls djfkl


i want to print 456015 and next 1 or 2 lines in some cases. and 456015 + above one line +below 1 or 2 lines.