.TH WRITE 2 .SH NAMEwrite \- write on a file.SH SYNOPSIS.B write(fildes, buffer, nbytes).br.B char *buffer;.SH DESCRIPTIONA file descriptor is a word returned from asuccessful.I open,.I creat,.I dup,or.IR pipe (2)call..PP.I Bufferis the address of.I nbytescontiguousbytes which are written on the output file.The number of characters actually written is returned.It should be regarded as an errorif this is not the same as requested..PPWrites which are multiplesof 512 characters long and begin on a 512-byte boundaryin the fileare more efficient than any others..SH "SEE ALSO"creat(2), open(2), pipe(2).SH DIAGNOSTICSReturns\-1 on error: bad descriptor, buffer address, orcount; physical I/O errors..SH ASSEMBLER(write = 4.).br(file descriptor in r0).br.B sys  write; buffer; nbytes.br(byte count in r0)