How to output a line from a file and the next 5 lines in Linux

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Suppose you are searching among the files setenv.sh and setenv.sh.tpl for the line containing

Djava.rmi.server.hostname

and you need to output that line along with the next 5 lines. Then use:

find . -type f -name 'setenv.sh*' -exec grep -I -nH -A5 'Djava\\.rmi\\.server\\.hostname' {} \;

Here, -I ignores binary files.

If you need to add 2 lines before, then:

find . -type f -name 'setenv.sh*' -exec grep -I -nH -B2 -A5 'Djava\\.rmi\\.server\\.hostname' {} \;

Instead of -B2 -A5, you can use -C5 if you want 5 lines before and after.