The commands in FreeBSDs don't work the same like in linux

L4Z3R · 01-30-2018, 07:39 PM

Hi

I was going to practice some regex in freebsd 11.1, but grep in BSD doesn't support -P perl switch

grep: The -P option is not supported

I then tried to used sed to replace the first letter and make it uppercase like so: Hello There

Code:

echo "hello there" | sed 's/\<\(\w\)/\u\1/g'
echo "hello there" | sed 's/\b\(\w\)/\u\1/g'
echo "hello there" | sed 's/\<\(.)/\u\1/g'

but these didn't work either.

However, it does work in linux.

I'm surprised how limited the commands in BSDs are to linux.

syg00 · 01-30-2018, 07:54 PM

To ease your surprise I suggest you investigate what POSIX means.
The try using the POSIX flags on the tools in Linux. You might find it enlightening.

L4Z3R · 01-30-2018, 08:24 PM

Hi syg00

The above commands work in linux just fine. In freebsd, the grep command doesn't support the perl switch and sed in freebsd doesn't seem to understand the regex.

ntubski · 01-30-2018, 08:43 PM

Quote:

Originally Posted by L4Z3R

I'm surprised how limited the commands in BSDs are to linux.

Did you have a question?

Most GNU/Linux distros come with GNU tools (some, mostly those aimed at tiny machines use things like busybox instead). You can install the GNU tools on BSD as well, if you like.

L4Z3R · 01-30-2018, 08:51 PM

Quote:

Originally Posted by ntubski

Did you have a question?

Most GNU/Linux distros come with GNU tools (some, mostly those aimed at tiny machines use things like busybox instead). You can install the GNU tools on BSD as well, if you like.

I'm new to the BSDs so I don't know much. I'm just testing the waters. Linux is my main desktop