ulimit

[Wilfred Chau_1]

#! /usr/bin/sh
ulimit -n 1024
/usr/bin/ulimit -n 1024


If I put the above to a script(posix shell interpreter), what are the differences?

I should say it clearly, the second ulimit didn't set the nofiles limit.

[RAC_1 · Accepted solution]

You are using - #! /usr/bin/sh

so
ulimit -n 1024 is enough.

[Wilfred Chau_1]

so there is a builtin function within posix shell and another is just an executable?

[RAC_1]

that is right.

[Wilfred Chau_1]

One last question. Is there any documentation on this?

[RAC_1]

man sh-posix
man ksh

[Wilfred Chau_1]

Thanks RAC.