# Example of restartable bootstrap. It runs 10
# separate bootstraps, and then combines the 
# results in file1.dta...file10.dta. If the job
# is interrupted only the file in progress needs
# to be recomputed. The files that can be skipped
# are noted by the -confirm file- command. 
# Saving to tmp, then copying to another location
# makes the individual groups atomic. 
# The -in 1/L- qualifier is necessary. 
 
 log using bs,text replace
 set rmsg on
 set processors 4
 set more off
 set obs 100000
 gen x = uniform()
 gen y = uniform() + x

 forvalues i=1/10 {
   capture confirm file file`i'.dta
  if _rc == 0 {
     di "skip `i' 
   }
   else {
     set seed 1234`i'56
     di "do " `i'
     quietly bootstrap, reps(50) saving(tmp,replace):  reg y x
     shell mv tmp.dta file`i'.dta
   } 
 }
 clear
 forvalues i=1/10 {
   append using file`i'
 }
 bstat in 1/L