| -c -case | ignore upper/lower Case differences |
| -eauto | EOL AutoMode enabled |
| -ed | EOLs written for DOS |
| -em | EOLs written for MacOS |
| -eu | EOLs written for Unix |
| -enauto | Encoding AutoMode enabled |
| -enf spec | Encoding for files(1st, 2nd, and Parent) |
| For Example: -enfUnicodeLittle | |
| -en1 spec | Encoding for 1st files |
| For Example: -en1UnicodeLittle | |
| -en2 spec | Encoding for 2nd files |
| For Example: -en2UnicodeLittle | |
| -enp spec | Encoding for Parent files |
| For Example: -enpUnicodeLittle | |
| -ens spec | Encoding for Saved files(Dif, RCS, MergeResult, and HTML) |
| For Example: -ensUnicodeLittle | |
| -fxxx,yyy | ignore Field in columns xxx through yyy |
| For Example: -f73,80 ignores columns 73 through 80 | |
| May be specified twice for 2 fields | |
| -h -help | display this Help message |
| -k | ignore blanK lines(inserted or deleted) |
| -q RE -ql RE | Quietly ignore changed, inserted, or deleted lines matching regular expression RE |
| ie. -ql^[:blank:]*//.*$ | |
| -qp RE | Quietly ignore parts of lines matching regular expression RE |
| ie. -qp//.*$ | |
| -qb RE | Quietly ignore blocks of lines matching regular expression RE |
| ie. -qb/\*.*?\*/ | |
| Upto 6 -q options are accumulated | |
| -s -sure | SureMerge(3-Way) |
| -tab tt | expand tabs at tt spaces(applied for -f) |
| tt defaults to 8, ie. -t4 | |
| -w -white | ignore all White space differences |
| -wl | ignore Leading White space differences |
| -we | ignore Embedded White space differences |
| -wt | ignore Trailing White space differences |
| -x nn | eXpand attention focus by nn lines |
| For Example: -x2 eXpands attention focus by 2 lines |