309 The
 310 ``b'',
 311 ``r'',
 312 ``s'',
 313 ``t'',
 314 ``w'',
 315 ``y'',
 316 ``\&!'',
 317 and
 318 ``\&:''
 319 functions all accept additional arguments.
 320 The following synopses indicate which arguments have to be separated from
 321 the function letters by white space characters.
 322 
 323 Two of the functions take a function-list.
 324 This is a list of
 325 \fBsed\fP
 326 functions separated by newlines, as follows:
 327 
 328 { function
 329 .br
 330   function
 331 .br
 332   ...
 333 .br
 334   function
 335 .br
 336 }
 337 .br
 338 
 339 The
 340 ``{''
 341 can be preceded by white space and can be followed by white space.
 342 The function can be preceded by white space.
 343 The terminating
 344 ``}''
 345 must be preceded by a newline or optional white space.
 346 
 347 .TP
 348 [2addr] function-list
 349 Execute function-list only when the pattern space is selected.
 350 
 351 .TP
 352 [1addr]a\e
 353 .TP
 354 text
 355 Write
 356 .IR text
 357 to standard output immediately before each attempt to read a line of input,

 309 The
 310 ``b'',
 311 ``r'',
 312 ``s'',
 313 ``t'',
 314 ``w'',
 315 ``y'',
 316 ``\&!'',
 317 and
 318 ``\&:''
 319 functions all accept additional arguments.
 320 The following synopses indicate which arguments have to be separated from
 321 the function letters by white space characters.
 322 
 323 Two of the functions take a function-list.
 324 This is a list of
 325 \fBsed\fP
 326 functions separated by newlines, as follows:
 327 
 328 { function

 329   function

 330   ...

 331   function
 332 .br
 333 }

 334 
 335 The
 336 ``{''
 337 can be preceded by white space and can be followed by white space.
 338 The function can be preceded by white space.
 339 The terminating
 340 ``}''
 341 must be preceded by a newline or optional white space.
 342 
 343 .TP
 344 [2addr] function-list
 345 Execute function-list only when the pattern space is selected.
 346 
 347 .TP
 348 [1addr]a\e
 349 .TP
 350 text
 351 Write
 352 .IR text
 353 to standard output immediately before each attempt to read a line of input,