337        Example 3 Tracing a Shell Script
 338 
 339 
 340        The following example produces a trace of the spell(1) command on the
 341        file truss.out:
 342 
 343 
 344          example$ truss -f -o truss.out spell document
 345 
 346 
 347 
 348 
 349        spell is a shell script, so the -f flag is needed to trace not only the
 350        shell but also the processes created by the shell. (The spell script
 351        runs a pipeline of eight processes.)
 352 
 353 
 354        Example 4 Abbreviating Output
 355 
 356 
 357        The following example abreviates output:
 358 
 359 
 360          example$ truss nroff -mm document >nroff.out
 361 
 362 
 363 
 364 
 365        because 97% of the output reports lseek(), read(), and write() system
 366        calls. To abbreviate it:
 367 
 368 
 369          example$ truss -t !lseek,read,write nroff -mm document >nroff.out
 370 
 371 
 372 
 373        Example 5 Tracing Library Calls From Outside the C Library
 374 
 375 
 376        The following example traces all user-level calls made to any function
 377        in the C library from outside the C library:

 337        Example 3 Tracing a Shell Script
 338 
 339 
 340        The following example produces a trace of the spell(1) command on the
 341        file truss.out:
 342 
 343 
 344          example$ truss -f -o truss.out spell document
 345 
 346 
 347 
 348 
 349        spell is a shell script, so the -f flag is needed to trace not only the
 350        shell but also the processes created by the shell. (The spell script
 351        runs a pipeline of eight processes.)
 352 
 353 
 354        Example 4 Abbreviating Output
 355 
 356 
 357        The following example abbreviates output:
 358 
 359 
 360          example$ truss nroff -mm document >nroff.out
 361 
 362 
 363 
 364 
 365        because 97% of the output reports lseek(), read(), and write() system
 366        calls. To abbreviate it:
 367 
 368 
 369          example$ truss -t !lseek,read,write nroff -mm document >nroff.out
 370 
 371 
 372 
 373        Example 5 Tracing Library Calls From Outside the C Library
 374 
 375 
 376        The following example traces all user-level calls made to any function
 377        in the C library from outside the C library: