sed statement misbehaves with BSD based sed

[timcharper]

The logic on the following line only works with GNU sed variants, but breaks horribly on Darwin variants.

sbt-launcher-package/src/universal/bin/sbt

Line 140 in c0b961c

cat "$1" | sed '/^\#/d;s/\r$//' | while read -r line || [[ -n "$line" ]]; do

Observe:

OS X (BSD sed)

$ echo "-J-server" | sed 's/\r$//'
-J-serve

Linux (GNU sed)

echo "-J-server" | sed 's/\r$//'
-J-server

BSD removes the last r from all lines that end in the letter r.

Different approach

We can use pass the literal "\r" character to sed. This seems to work:

OS X (BSD sed)

$ echo "-J-server" | sed $'s/\r$//'
-J-server

$ printf $'ABCD\r\nABCD\n' | sed $'s/\r$//' | xxd
0000000: 4142 4344 0a41 4243 440a                 ABCD.ABCD.

Linux (GNU sed)

$ echo "-J-server" | sed $'s/\r$//'
-J-server

$ printf $'ABCD\r\nABCD\n' | sed $'s/\r$//' | xxd
0000000: 4142 4344 0a41 4243 440a                 ABCD.ABCD.