tr - translate or delete characters
-s : squeeze -d : delete -t : translate
Example file: files.txt
$ file files.txt files.txt: ASCII text, with CRLF line terminators $ cat file 8V2L bny0 c4ZX D8B3 FHl1 oiMO PFbD rmfX SRSq uqyw v2Vb X1Uy
Combine lines
$ tr -s '\r\n' ' ' < files.txt 8V2L bny0 c4ZX D8B3 FHl1 oiMO PFbD rmfX SRSq uqyw v2Vb X1Uy $
Delete new line characters
$ tr -d '\n' < inputfile.txt > outputfile.txt