/work> 
/work> 
/work> 
/work> echo -en "1111\n2222\r3333\r\n4444" | gawk '//' {O,}RS="\r\n" | xxd -g 1 -u 
0000000: 31 31 31 31 0A 32 32 32 32 0D 33 33 33 33 0A 34  1111.2222.3333.4
0000010: 34 34 34 0D 0A                                   444..
/work> 
/work> echo -en "1111\n2222\r3333\r\n4444" | gawk '//' {O,}RS="\n\r" | xxd -g 1 -u 
0000000: 31 31 31 31 0A 32 32 32 32 0D 33 33 33 33 0A 34  1111.2222.3333.4
0000010: 34 34 34 0A 0D                                   444..
/work> 
/work> echo -en "1111\n2222\r3333\r\n4444" | gawk '//' {O,}RS="\n"   | xxd -g 1 -u 
0000000: 31 31 31 31 0A 32 32 32 32 0D 33 33 33 33 0A 34  1111.2222.3333.4
0000010: 34 34 34 0A                                      444.
/work> 
/work> echo -en "1111\n2222\r3333\r\n4444" | gawk '//' {O,}RS="\r"   | xxd -g 1 -u 
0000000: 31 31 31 31 0A 32 32 32 32 0D 33 33 33 33 0A 34  1111.2222.3333.4
0000010: 34 34 34 0D                                      444.
/work> 
/work> echo -en "1111\n2222\r3333\r\n4444"                           | xxd -g 1 -u 
0000000: 31 31 31 31 0A 32 32 32 32 0D 33 33 33 33 0D 0A  1111.2222.3333..
0000010: 34 34 34 34                                      4444
/work> 
/work> 
/work>