- in section 1 (User commands):
| jar | java | join | join-dctrl |
| jpeg2ps | jpegexiforient | jpegtopnm | jpegtran |
- in section 3 (Library functions):
| j0 | j0f | j0l | j1 |
| j1f | j1l | jn | jnf |
| jnl | jrand48 | jrand48_r |
- in section 8 (System administration commands):
| john |
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